Chemical Forums
General Forums => Generic Discussion => Topic started by: rctrackstar2007 on May 05, 2006, 03:34:08 PM
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Who all here is taking the AP Chemistry test this Wednesday?
Do you feel prepared?
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Trying to intimidate your opponents? :D
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No, i'm trying to see where everyone else is standing. I don't believe to be intimidating many people when I expect to only get a low to mid 4. I am just curious as to where people are standing and what measures they are taking to prepare for the test.
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Im one of the lucky few at my school who are about to take the AP exam. I feel pretty confident after taking two practice exams (previously released APs from '87 and 96') one of which was my final. I recieved 5's on both of them , but im still going to lightly study equilibrium (especially solubility) in order to get better at answering question #1. Nuclear chemistry, and atomic structure/quantum numbers etc. are also on my hit list. I am really good with reaction prediction so I am hoping that will maybe help me get a nice, solid 4 or a low 5 on the actual test.
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ya i'm getting better at reaction prediction but not quite there yet. i get about half the points possible or so. i get caught up on spectator ions. i also need to get down knowing the structures too because i almost always choose the wrong ones.
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I recommend you check out this document. It really helped me out with the reaction prediction. http://www.shs.nebo.edu/Faculty/Haderlie/apchem/Q4.pdf
Also, try to memorize the solubility rules.
Im really having a tough time with drawing lewis structures. Even seemingly simple ones such as O3 and CO3-. Thats another thing im going to have to really look over before the test.
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Im taking it and quite frank i think that you (rctrack star) sound a little over confident. Ive put in many saturdays and sundays with a few friends for study work and prep and we all still feel nervous. Id also like to say that the most of the past exams are not what this ap test will be like. It has become much harder from the opinions and things ive heard from people who have taken it from past years(who have also taken past exams prior to the ap test). Id also suggest you brush up on electro chemistry due to it being a manditory on the free response. Best of luck to you all though
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Who all here is taking the AP Chemistry test this Wednesday?
Do you feel prepared?
ME! i will be working toward a 5 so will see how it goes. bwhahahsahhAHHAhahAHHAha. hey check out my sig! do you want to be a part of the ap chem squad?
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haha sure. what exactly is your chem squad?
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well i just made it up, you can be Ap chemistry squad member [002]. :o
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I am so nervous about it! Chem is my absolute worst subject (well that and math, I'm really more of a liberal arts type of person). For the next couple of days I'm planning on just reviewing 24/7. I hope it'll help. I am awful at the predicting products part too. I feel like that part is just pure memorization.
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Im taking it and quite frank i think that you (rctrack star) sound a little over confident. Ive put in many saturdays and sundays with a few friends for study work and prep and we all still feel nervous. Id also like to say that the most of the past exams are not what this ap test will be like. It has become much harder from the opinions and things ive heard from people who have taken it from past years(who have also taken past exams prior to the ap test). Id also suggest you brush up on electro chemistry due to it being a manditory on the free response. Best of luck to you all though
yeah i have heard the same.... i did not know that electrochemistry is a mandatory in the next AP....
In my school, thanks to the Hurricane season and 2 and a half weeks lost of school we are so delayed we will be having the test for the electrochemistry chapter after the exams, we have not even finished reviewing the chapter and we only have one more class together. the past few days have been brutal, i have been studying for endless hours, but the subject matter is starting to get boring, and other stuff is getting more amusing then chemistry which is not good because i usually find my self playing a game.
So does any one know a good site that will kind of give an over view of everything in chemistry we have learned so far? Or actually what have you guys been doing as far as any techniques for studying for this exam?
i have been going to [a href="http://www.sparknotes.com/chemistry/"]Sparknotes[/a] and viewing what they have on chemistry.
I also used to look for college lectures dealing on chemistry and used to find some interesting ones that did not explain everything, and some really boring ones from places like MIT that explained everything but where so high leveled that you just got lost.
either way hope for the best of luck for those of you taking the AP's this wednesday..
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there are a few good websites, chemmybear is one of them, they have flashcards and stuff.
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Who all here is taking the AP Chemistry test this Wednesday?
Do you feel prepared?
ME! i will be working toward a 5 so will see how it goes. bwhahahsahhAHHAhahAHHAha. hey check out my sig! do you want to be a part of the ap chem squad?
me too! I'm working toward a 5 as well but I'm expecting a 4.
mrdeadman: i would suggest making the "do you want to be a part of the ap chem squad" into a hyperlink so that it is easy to join and I'll be chem squad member [003] or whatever
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yeah, just put it into your sig.
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oh... so you didn't make a new usergroup or anything like that?
okay
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no, im not special like that :P
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when we do our tie dye i vote we put on the back or something the "AP Chem Squad"
maybe??
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we do the tie dye thursday after school. right after the physics field trip.
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for me i am praying for a 4 but will most likely not do that well, probably a 3.
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when we do our tie dye i vote we put on the back or something the "AP Chem Squad"
maybe??
that would be sick. haha. im number [001] :o
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dude the number thing would be so sick and hey i am ok with 004
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dude the number thing would be so sick and hey i am ok with 004
well that's good because no one else is going to give up their number, oh, and if anyone else wants to join just for the sheer entertainment of applying it to their sig, be my guest, just go in numerical order. :)
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if he wants to be number 3 ill give up my number in exchange for number 5... so i can be roman numeral V ;)
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no i'm ok with 004
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well if we're going in roman numerals i'll take like 1981248721304123948 just for fun then lol
but ya no one is getting my [002]
who all is going on the physics trip thursday from our class?
p.s. i love how the HS room and the general discussion is being dominated by us now lol furgy will be proud
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indeed, we should get Mr. F to join. anyway, here's who i know of that is going from our chem class:
myself
you, of course
tyler
matt
malcolm
marie
tanille
others i'm not sure, except i know ryan's not going
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there are only two others possible lol
if furganwinkle joined he would be in the engineering stuff having fun and then come to ours to tell us when we're wrong or tell us that we're genious'
if we have to really do worksheets and stuff on the trip i'm gonna flip
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somebody call those guys and tell them to get on, we could have sort of a crunch study time now. ;D hell yes.
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there are only two others possible lol
if furganwinkle joined he would be in the engineering stuff having fun and then come to ours to tell us when we're wrong or tell us that we're genious'
if we have to really do worksheets and stuff on the trip i'm gonna flip
hahahahaha furanwinkle. ;D worksheets are :-X at least she isn't making me buy pos school gear.
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online?? how do we plan on doing that?? ???
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dammit, somebody took some scooby snacks.
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online?? how do we plan on doing that?? ???
just get your practice tests together and we could converse or whatever you know?
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online?? how do we plan on doing that?? ???
just get your practice tests together and we could converse or whatever you know?
ya that would work i guess. who all is on right now?
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dammit, somebody took some scooby snacks.
you still have 3, same as before ???
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you still have 3, same as before ???
i had 4 about an hour ago. :o
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ya that would work i guess. who all is on right now?
i think it's just me, you and sykes. we should call people and tell them to get on.
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oh haha i gave you that one
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dammit, somebody took some scooby snacks.
which means nothing so who cares...
anyway, i'm in for a last minute study
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i'm going to go grab my tests real quick and see what all i have left lol i have like 2 problems i could possibly do
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which means nothing so who cares...
yeah?! no snacks for you! :P
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i can fight like that too you know... your down to 1 now and i have... oh that's right, i don't care
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dammit, somebody took some scooby snacks.
which means nothing so who cares...
anyway, i'm in for a last minute study
scooby snacks mean something to us alright lol i gave you one thank you very much and this is how you react??
we MUST beat Borek in scoobies and posts!! we MUST! lol ;D
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ok fine... i already gave you 1 btw and i'll give mredeadman's back... i feel like a kindergarten teacher "let's play nice kids"
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i agree, we must own borek. grrr! stop taking my snacks sykes! they're mine! >:(
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did you call anyone yet?
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haha, score! back to three. :-*
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no one called me
and Borek has nothing on us we rock this forum
i.e. look at this chat alone, started by yours truely lol
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ok kool we can all strive to beat borek...
who do you want me to call... that's not asleep already
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ok kool we can all strive to beat borek...
who do you want me to call... that's not asleep already
i sent you a list of names as a pm, no they aren't asleep yet, they are studying ferociously for the TEST.
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if they are asleep we can wake them, it is of vital importance to theirs and our futures
too bad furganwinkle isn't registered yet :P
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k kool we can all strive to beat borek...
lol :D
Don't forget that quality counts for more than quantity ;)
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if they are asleep we can wake them, it is of vital importance to theirs and our futures
too bad furganwinkle isn't registered yet :P
vital importance? you think one night of last minute studying is going to send you from a 2 to a 5 or something? the important part is what we have already done all year, and of course the energy drinks in the morning ;)
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Don't forget that quality counts for more than quantity ;)
yeah, but on the internet, you get kudos for having a lot of posts, people think you're smart if you have 30000 posts ;) haha.
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vital importance? you think one night of last minute studying is going to send you from a 2 to a 5 or something? the important part is what we have already done all year, and of course the energy drinks in the morning ;)
just call 'em you stupid expletive.
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people think you're smart if you have 30000 posts
No fear of that here ;)
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sure guys just totally forget about me, thanks a lot
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No fear of that here ;)
mike, you have to be one of the coolest guys on this board, and im not just saying that to score more scooby snacks. ;)
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sure guys just totally forget about me, thanks a lot
you were offline, so i don't want to hear about it.
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vital importance? you think one night of last minute studying is going to send you from a 2 to a 5 or something? the important part is what we have already done all year, and of course the energy drinks in the morning ;)
just call 'em you stupid expletive.
excuse me! 3/4 to a 5
i'm not that dumb
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true quality is better, but i still like having the numbers :)
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sure guys just totally forget about me, thanks a lot
i was about to call you, really
so how about some questions or something guys?
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how about #6 on the 2004 free response?
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how about #6 on the 2004 free response?
which part?
i have the whole thing done but not checked all the way
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hey guys have any of you figured out why number 55 on the 02 test is first order.
here is the question
Time (days) 0 1 2 3 4 5 6 7 10 20
%Reactant 100 79 63 50 40 31 25 20 10 1
Remaining
we know the half life is 3 days but why is it first order?
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part (a) i cant remember any of this bs. :P how about b and c as well.
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i thought it first because it progresses at a constant 3 days instead of 3-9-27. that is probably wrong but it got the right answer.
mike...
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part (a) i cant remember any of this bs. :P how about b and c as well.
do you need help figuring out how to do it or what?
for a) remember the cathode is the reduced one.
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b) follows the same concept as circuits in physics...
and c) is simple algebra
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dude on number 6 part c don't you just do the E0cell minus the E0 that they gave you?
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dude on number 6 part c don't you just do the E0cell minus the E0 that they gave you?
close, tyler don't look yet if you haven't done it
the equation is set up as -.14 - x = .60, solve for x which comes out to...
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b) follows the same concept as circuits in physics...
and c) is simple algebra
that doesn't help. explain please.
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b) follows the same concept as circuits in physics...
and c) is simple algebra
that doesn't help. explain please.
well in circuits, which way do electrons flow? from - (cathode) to + (anode) or opposite.
and note the reply to matt for the other
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what exactly is delta G and delta S
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didn't tesdahl say that the e- flow opposite of current which means they go from anode to cathode right?
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ok, what's the net-ionic equation? cr3+ + Sn -> Cr + Sn2+
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for part d, would the metal be Se? or maybe Te?
G is gibbs free energy... doesn't a positive delta G mean the reaction is spontaneous?
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what exactly is delta G and delta S
delta g is gibbs free energy-tells spontaneity of reaction, delta s is entropy-tells how orderly the products are in relation to the reactants.
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didn't tesdahl say that the e- flow opposite of current which means they go from anode to cathode right?
exactly!!
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for part d, would the metal be Se? or maybe Te?
G is gibbs free energy... doesn't a positive delta G mean the reaction is spontaneous?
Cr3+
and a positive delta g is nonspontaneous.
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i thought that if delta g was negative that meant it was spontaneous
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didn't tesdahl say that the e- flow opposite of current which means they go from anode to cathode right?
electrons flow from negative to positive bcuase of attraction... conventional current is opposite of that
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i thought that if delta g was negative that meant it was spontaneous
i beat you to it aHA! :o
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what is the difference between diprotic and monoprotic?
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what exactly is delta G and delta S
neg delta S means the reaction becomes more entropoetic (??wordage??) as it proceeds
neg delta G means spontaneous
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didn't tesdahl say that the e- flow opposite of current which means they go from anode to cathode right?
electrons flow from negative to positive bcuase of attraction... conventional current is opposite of that
yeah but which is which, anode positive or negative? im thinking negative but not sure.
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how do you know the metal is Cr3+?
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anode is the negative
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what is the difference between diprotic and monoprotic?
diprotic means 2 H+ ions and mono means 1 H+ ions...
someone check me on that
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didn't tesdahl say that the e- flow opposite of current which means they go from anode to cathode right?
electrons flow from negative to positive bcuase of attraction... conventional current is opposite of that
yeah but which is which, anode positive or negative? im thinking negative but not sure.
cathode is positive and anode is negative
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how do you know the metal is Cr3+?
i have a standard reduction potentials in aqueous solution at 25C sheet and Cr3+ is -0.74
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if you take cathode as negative, you accept conventional current for this. so the anode flows to the cathode (- to +)
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what is the difference between diprotic and monoprotic?
diprotic means 2 H+ ions and mono means 1 H+ ions...
someone check me on that
yeah... that's right. diprotic, two protons to lose.
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what is the difference between diprotic and monoprotic?
diprotic means 2 H+ ions and mono means 1 H+ ions...
someone check me on that
yeah... that's right. diprotic, two protons to lose.
damn it feels good to be right for once lol
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if you combine NaI and PB2+ do you get a yellow precipitate or would it be yellow with CrO42-?
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we will get a formulas sheet right?
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how do you know the metal is Cr3+?
i have a standard reduction potentials in aqueous solution at 25C sheet and Cr3+ is -0.74
can i assume we will be given that sheet on the test tomorrow?
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if you combine NaI and PB2+ do you get a yellow precipitate or would it be yellow with CrO42-?
you get PbI2
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we will get a formulas sheet right?
you get anything you will need except a calculator which they have extras of
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can i assume we will be given that sheet on the test tomorrow?
that's the only way in hell i would ever be able to get a question like that right.
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if you combine NaI and PB2+ do you get a yellow precipitate or would it be yellow with CrO42-?
doesn't sodium burn yellow and chromate burn purple or something like that?
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if you combine NaI and PB2+ do you get a yellow precipitate or would it be yellow with CrO42-?
doesn't sodium burn yellow and chromate burn purple or something like that?
the sodium yes for sure but i haven't burned chromate before so i don't know
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doesn't sodium burn yellow and chromate burn purple or something like that?
i don't know but i just read the question again, and no, the precipitant isn't yellow, it is with the CrO4 though. dichromate is red. or is it the other way around?
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sykes got second page ownage. :P
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can i assume we will be given that sheet on the test tomorrow?
that's the only way in hell i would ever be able to get a question like that right.
lol i agree
i hate those odd ones like chromate and dichromate and stuff
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hey look, i have three stars now, 100 posts ftw!
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just a small tangent, we've gone almost 100 pages in less than an hour and tyler has become a full member with 100 posts
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furgy had the chromate solution as yellow right and the dichromate as orange right?
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hey look, i have three stars now, 100 posts ftw!
i'm on the way
i only have 30+ to go
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doesn't sodium burn yellow and chromate burn purple or something like that?
i don't know but i just read the question again, and no, the precipitant isn't yellow, it is with the CrO4 though. dichromate is red. or is it the other way around?
when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
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furgy had the chromate solution as yellow right and the dichromate as orange right?
that's what i remember but my memory isn't all i could hope for lol
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i'm on the way
i only have 30+ to go
hell yes! i wonder how many useless posts i have to make before i get more stars.
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doesn't sodium burn yellow and chromate burn purple or something like that?
i don't know but i just read the question again, and no, the precipitant isn't yellow, it is with the CrO4 though. dichromate is red. or is it the other way around?
when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
the chromate was yellow or something lite and the dichromate was dark
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sykes got second page ownage. :P
ya but you're still owning me with post count, grr
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doesn't sodium burn yellow and chromate burn purple or something like that?
i don't know but i just read the question again, and no, the precipitant isn't yellow, it is with the CrO4 though. dichromate is red. or is it the other way around?
when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
no that was copper and some other solution i can't remember
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i'm on the way
i only have 30+ to go
hell yes! i wonder how many useless posts i have to make before i get more stars.
i have no clue lol but these ones aren't as useless as the immigration stuff lol
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when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
ppt's man, those test tubes didn't have ppt's.
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sykes got second page ownage. :P
ya but you're still owning me with post count, grr
tyler and i are owning the snack count at a solid 3 lol no one take any away for this reply
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no that was copper and some other solution i can't remember
chromium
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tyler and i are owning the snack count at a solid 3 lol no one take any away for this reply
something about that just made me laugh ;D
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when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
ppt's man, those test tubes didn't have ppt's.
but when he did the in class thing didn't he shift it by adding like more chromate or dichromate to make it change colors and the chromate became all cloudy and what not
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furgy is gonna read what we did on here just before the test and prolly give us all A's or something for just putting forth such an effort just before the test
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sykes got second page ownage. :P
ya but you're still owning me with post count, grr
tyler and i are owning the snack count at a solid 3 lol no one take any away for this reply
i think that's because tyler took one of my snacks and never gave it back, grr
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Total time logged in: 7 hours and 15 minutes. :-\ that's pretty sad, because everytime i leave the site it logs me out.
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when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
ppt's man, those test tubes didn't have ppt's.
but when he did the in class thing didn't he shift it by adding like more chromate or dichromate to make it change colors and the chromate became all cloudy and what not
very true. was that just the solution going back to solid form or was there another ppt
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when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
ppt's man, those test tubes didn't have ppt's.
but when he did the in class thing didn't he shift it by adding like more chromate or dichromate to make it change colors and the chromate became all cloudy and what not
you're talking about an entirely different thing here buddy.
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sykes got second page ownage. :P
ya but you're still owning me with post count, grr
tyler and i are owning the snack count at a solid 3 lol no one take any away for this reply
i think that's because tyler took one of my snacks and never gave it back, grr
you would still be at 2 tho
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when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
ppt's man, those test tubes didn't have ppt's.
but when he did the in class thing didn't he shift it by adding like more chromate or dichromate to make it change colors and the chromate became all cloudy and what not
that was acid base equilibriums not ppt's
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Total time logged in: 7 hours and 15 minutes. :-\ that's pretty sad, because everytime i leave the site it logs me out.
4 hours and 46 minutes
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when mr. F did that thing with all the different colored test tubes wasn't chromate purple and dichromate blue or am i thinking of something else?
ppt's man, those test tubes didn't have ppt's.
but when he did the in class thing didn't he shift it by adding like more chromate or dichromate to make it change colors and the chromate became all cloudy and what not
that was acid base equilibriums not ppt's
true
what tyler's saying is the like 7 test tubes or whatever on his table that he keeps talking about
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no that was copper and some other solution i can't remember
chromium
i thought we just figured chromium to be yellow?
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that was acid base equilibriums not ppt's
yeah, but i remember one with the chromate-dichromate deal.
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no that was copper and some other solution i can't remember
chromium
i thought we just figured chromium to be yellow?
yes it is yellow. someone google it
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i thought we just figured chromium to be yellow?
that's chromate
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if it wasn't for these quotes, i would be confused out my ass hole
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i thought we just figured chromium to be yellow?
that's chromate
which is what he had in the test tubes right?
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http://chemmovies.unl.edu/chemistry/dochem/DoChemJPGs/DC110ChromateRxs.jpg
go to that site and you'll see the chromate-dichomate equilibrium... definitely yellow
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if it wasn't for these quotes, i would be confused out my ass hole
i know!
this site rocks hard core with it's quotes and cool layouts
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i thought we just figured chromium to be yellow?
that's chromate
which is what he had in the test tubes right?
yes
chromate would be chrome colored obviously
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yes it is yellow. someone google it
chromium in solution: (http://www.public.asu.edu/~jpbirk/qual/qualanal/CR/Cr4bppt.gif)
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http://chemmovies.unl.edu/chemistry/dochem/DoChemJPGs/DC110ChromateRxs.jpg
go to that site and you'll see the chromate-dichomate equilibrium... definitely yellow
good, solved lol chromate yellow dichromate orange
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i just broke the 6 hour mark... i don't think it always logs me out when i leave the site though
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dudes i have to go its past my bed time :'(
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yes it is yellow. someone google it
chromium in solution: (http://www.public.asu.edu/~jpbirk/qual/qualanal/CR/Cr4bppt.gif)
tampered solution or something??
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i just broke the 6 hour mark... i don't think it always logs me out when i leave the site though
it pisses me off because i have to log back on every time. :P bastards!
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i just broke the 6 hour mark... i don't think it always logs me out when i leave the site though
i'm almost at 5
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dudes i have to go its past my bed time :'(
see ya
good luck in the morning and get there on time lol
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i just broke the 6 hour mark... i don't think it always logs me out when i leave the site though
you have to hit the logout button which is why i am only at 3 hrs and 45 minutes
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tampered solution or something??
chromium and chromate are two different things here trevie-trev-meister
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i just broke the 6 hour mark... i don't think it always logs me out when i leave the site though
it pisses me off because i have to log back on every time. :P bastards!
not me, i just go to the site and i'm logged in. but i think it still stops my time when i leave
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yes it is yellow. someone google it
chromium in solution: (http://www.public.asu.edu/~jpbirk/qual/qualanal/CR/Cr4bppt.gif)
tampered solution or something??
chromium- green(ish)
chromate-yellow
dichromate- orange
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not me, i just go to the site and i'm logged in. but i think it still stops my time when i leave
dam you!
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tampered solution or something??
chromium and chromate are two different things here trevie-trev-meister
whatev lol it's getting late
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yes it is yellow. someone google it
chromium in solution: (http://www.public.asu.edu/~jpbirk/qual/qualanal/CR/Cr4bppt.gif)
tampered solution or something??
chromium- green(ish)
chromate-yellow
dichromate- orange
yes! one prob down. 10 million to go lol
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well it is almost that time, 5 minutos for me. anyway's we should do this a lot more, this was sick, i feel better about the chem test now. ;D
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not me, i just go to the site and i'm logged in. but i think it still stops my time when i leave
dam you!
oh lucky me lol
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ya i think i'll leave for the night as well... good luck on the test tomorrow everyone
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well it is almost that time, 5 minutos for me. anyway's we should do this a lot more, this was sick, i feel better about the chem test now. ;D
i agree! this is way tight! we need to talk to some admin about a chem club at school like officially
final check, what time must we be at the church tomorrow?
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yeah, you as well, see you laterz dogz homeslyce stylin' g dogg. :P that was ghey i know. anyways, see you tomorrow.
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7:30 but early never hurts
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730 i think, kelly, don't go to the wrong place again. BHwhahhAHhAHahHAha :P
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sounds good
good luck everyone i'm out at a solid 5 hours, 85 posts, 2 stars, 3 snacks, and 1 test later lol
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2 hours untill the TEST ;D haha. where are you guys? :P
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chromium- green(ish)
chromate-yellow
dichromate- orange
Chromium is a metal and it certainly isnt't green! (it is chrome colored surprisingly! ;))
Cr2+(aq) is turquoise
Cr3+(aq) is blue-violet (to me it looks green (maybe when excess orange dichromate (as oxidising agent) is used it makes the 'bluey' Cr3+ look greenish), but I'm just quoting my book!)
Cr2O3 is green
CrO3 is yellow
K2CrO4 is yellow (CrO42-(aq) is yellow!)
K2Cr2O7 is orange (Cr2O72-(aq) is orange)
Anyway, how did the test go?
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Anyway, how did the test go?
dude the test went great, it was much easier than the ones our teacher gave to us in class, everything we talked about seemed to show up on the test right guys? 8)
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2 hours untill the TEST ;D haha. where are you guys? :P
squad member 002 was sleeping and then showering and driving duh
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chromium- green(ish)
chromate-yellow
dichromate- orange
Chromium is a metal and it certainly isnt't green! (it is chrome colored surprisingly! ;))
Cr2+(aq) is turquoise
Cr3+(aq) is blue-violet (to me it looks green (maybe when excess orange dichromate (as oxidising agent) is used it makes the 'bluey' Cr3+ look greenish), but I'm just quoting my book!)
Cr2O3 is green
CrO3 is yellow
K2CrO4 is yellow (CrO42-(aq) is yellow!)
K2Cr2O7 is orange (Cr2O72-(aq) is orange)
Anyway, how did the test go?
well chromium is obviously green bc we have provided a picture of it below in our 100+ posts lol
the test was cake for me but we'll find out in a couple months if it really was or i just didn't know what i was doing lol
yes tyler, i used cake just like you
how was the test for you?
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deadman! where did your scoobies go? you got robbed
((i think borek took em cuz we're trying to beat him lol))
either way we'll get it back to normal
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chromium- green(ish)
chromate-yellow
dichromate- orange
Chromium is a metal and it certainly isnt't green! (it is chrome colored surprisingly! ;))
Cr2+(aq) is turquoise
Cr3+(aq) is blue-violet (to me it looks green (maybe when excess orange dichromate (as oxidising agent) is used it makes the 'bluey' Cr3+ look greenish), but I'm just quoting my book!)
Cr2O3 is green
CrO3 is yellow
K2CrO4 is yellow (CrO42-(aq) is yellow!)
K2Cr2O7 is orange (Cr2O72-(aq) is orange)
Anyway, how did the test go?
well chromium is obviously green bc we have provided a picture of it below in our 100+ posts lol
the test was cake for me but we'll find out in a couple months if it really was or i just didn't know what i was doing lol
yes tyler, i used cake just like you
how was the test for you?
That green solution was not chromium, chromium looks like this:
(http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA4/STILLS64/CmCz_elt/Cr/Cr_element/5.JPG)
and it has a melting point of 1857oC
That green solution is most probably Cr(OH)4- (which is a soluble Chromium(III) hydroxide, as excess hydroxide may have been added- like how cobalt (and Zn) hydroxide go soluble with conc. hydroxide (because they become negatively charged)). But I don't know for sure (I do know its NOT chromium!), and if anyone could confirm/correct this that'd be great. ;D
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trev how was lunch? oh and i did get the Red Hot Chilipeppers cd and ya it kicks major butt
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deadman! where did your scoobies go? you got robbed
((i think borek took em cuz we're trying to beat him lol))
yeah man, it is teh ghey! what kind of retarded bs is this?! they took yours too? gah! :P >:(
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trev how was lunch? oh and i did get the Red Hot Chilipeppers cd and ya it kicks major butt
lunch was fantasmastical
better than getting the chili peppers cd
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deadman! where did your scoobies go? you got robbed
((i think borek took em cuz we're trying to beat him lol))
yeah man, it is teh ghey! what kind of retarded bs is this?! they took yours too? gah! :P >:(
bastards! they did! they need reasons to do that i think
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ha tyler i told you chromium would be chrome colored, note below
what the hell did you find that was green??
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ha tyler i told you chromium would be chrome colored, note below
what the hell did you find that was green??
chromium in solution is green. yeah, they should have to give reasons for taking the snacks.
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hey, did anyone else join yet?
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oh i'm sooo done with the Cr thing lol i didn't even like it in the first place
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hey, did anyone else join yet?
not to my knowledge...
i'm gonna go steal some e-mails from the nicenet if it still exists and let em know about it
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yeah, nicenet is still up, but i never go to it anymore, this is so much cooler. let's just get sykes to call them
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haha good idea put it on him
i have now reached 3 stars! yes! lol
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100 posts ftw!
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what does ftw mean??
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what does ftw mean??
for the win.
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oh i see
that makes sense
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yeah, internet lingo :P
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im going to call the sykes and ryan and tell them to get on :P
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Have fun lol i'm prolly about to get off it for a few hours cuz i was on before you were
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dammit! what time will you be back on and ill try to get everyone on at that time.
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dammit! what time will you be back on and ill try to get everyone on at that time.
give me a time you want everyone on and i'll jump back on
i got nothing else to do really so i can come back whenever
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i emailed malcolm to tell him to sign up but no one elses email was on the nicenet so that's all i can do until tomorrow
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eh, i don't know, 8. 830.
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sounds pretty good to me
hopefully ryan will get his lazy :o on this thing and have some good quality discourse
we need fergunwinkle on here too. that'll be his name also, fergunwinkle or ferganwinkle or something like that
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sounds pretty good to me
hopefully ryan will get his lazy :o on this thing and have some good quality discourse
we need fergunwinkle on here too. that'll be his name also, fergunwinkle or ferganwinkle or something like that
yeah, that would be pretty funny if his sn was fergunwinkle.
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hey, if you want to chill on here a little longer, then ill call them.
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ok i can do that. i'll just bounce around for a bit until it livens up and then i'll come back non-stop lol
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ok i can do that. i'll just bounce around for a bit until it livens up and then i'll come back non-stop lol
im calling kelly right now.
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ok i'll prob be back in 15 to 30 unless something happens
i'll check in every few
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he tells me he'll call tanille, and then tanille will call marie. :P and someone should call ferguson.
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he tells me he'll call tanille, and then tanille will call marie. :P and someone should call ferguson.
i don't have his numero de telefono so i can't
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do you want it?
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do you want it?
sure, i'm not gonna call him now but sure
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pmed
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got it
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hahaha we have a third page now
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kelly says he is trying, but it won't let him into this thread. ???
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well that's simply unacceptable
i wish there were a specific "Tom" we could complain to lol
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i'm gonna start without him kinda
i'm gonna do the physics ws to get it out of the way and post any questions i have
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okay 2nd page was being retarded but 3rd page works fine so i'm good now... what's up?
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i'm gonna do the physics ws to get it out of the way and post any questions i have
we have a physics ws? surely its not due tomorrow is it?
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friday but i wanna get it done. it's on the website. if anyone does it tell me what you got for #3
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friday but i wanna get it done. it's on the website. if anyone does it tell me what you got for #3
well my printer won't print so i'm not going to start it right now but just use PV=nRT to answer that. Or if you want to use her formula: V1/T1=V2/T2. Don't forget to change the temperatures to K.
I don't have my calc handy but if u really want the answer tell me and i'll work it out.
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STP is 298 or 273 K?
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friday but i wanna get it done. it's on the website. if anyone does it tell me what you got for #3
well my printer won't print so i'm not going to start it right now but just use PV=nRT to answer that. Or if you want to use her formula: V1/T1=V2/T2. Don't forget to change the temperatures to K.
I don't have my calc handy but if u really want the answer tell me and i'll work it out.
actually these are WAY too easy. just use her formulas and there is no changing
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STP is 298 or 273 K?
STP is standard temperature and pressure... you're thinking of the conversion factor. Just add 273 to the celcius value to get Kelvin. Or 273.15 to be exact.
If I learned anything in Chemistry I'm pretty sure you do need to convert to Kelvin. Of course, she might not know that.
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a simple 273 would have been sufficient for this problem lol
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ok well that was easy, i'm done with that ws
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we need more people... matt said he can't get on tonite, have you called malcolm?
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i have no numbers lol the only numbers i have are ryan and tyler
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i have no numbers lol the only numbers i have are ryan and tyler
i'll fix that with a pm... you'll have all the numbers i do in a minute
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I don't know how you guys got over 200posts in this tread in like 48 hours but wow.
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Total time logged in: 7 hours and 15 minutes. :-\ that's pretty sad, because everytime i leave the site it logs me out.
It doesn't work this way - it assumes you are logged continuously if you fetch next page in less then about 15-20 minutes after previous one. So I have chemicalforums open at least 16 hours a day but the system doesn't count all that time, as I am often off to other tasks for an hour or so.
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a simple 273 would have been sufficient for this problem lol
Check out http://en.wikipedia.org/wiki/Standard_conditions_for_temperature_and_pressure for the list of different temperatures as defined by different chemistry/physics etc. institutions. It is mostly either 273.15K or 293.15K, but at A-Level 293.15K is used, and I think thats the temperature that is most frequently quoted.
I think that question is best asked in a chemistry forum. ;) (ie not the general discussion forum)!
I don't know how you guys got over 200 posts in this tread in like 48 hours but wow.
Some people may not have yet discovered the wonders of www.messenger.msn.com/ (http://www.messenger.msn.com/) or http://messenger.yahoo.com/ (or other IM programs)! ;D
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a simple 273 would have been sufficient for this problem lol
Check out http://en.wikipedia.org/wiki/Standard_conditions_for_temperature_and_pressure for the list of different temperatures as defined by different chemistry/physics etc. institutions. It is mostly either 273.15K or 293.15K, but at A-Level 293.15K is used, and I think thats the temperature that is most frequently quoted.
I think that question is best asked in a chemistry forum. ;) (ie not the general discussion forum)!
I don't know how you guys got over 200 posts in this tread in like 48 hours but wow.
Some people may not have yet discovered the wonders of www.messenger.msn.com/ (http://www.messenger.msn.com/) or http://messenger.yahoo.com/ (or other IM programs)! ;D
first, i was just asking a quick question on hw
second, we all know about all of those but this one is better, we like it more and there's no problem with that
it was mostly about study for the test anyways
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I don't know how you guys got over 200posts in this tread in like 48 hours but wow.
studying lol we were getting ready for the test in the morning
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first, i was just asking a quick question on hw
second, we all know about all of those but this one is better, we like it more and there's no problem with that
it was mostly about study for the test anyways
lol you don't have to come up with excuses- using the general discussion board is probably fine for asking other people for phone numbers and general chit-chat etc., I was just suggesting easier methods of asking those kind of questions.
Sorry if I sounded rude :)!
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mostly it's just us in here though and everyone has to do the same work, so we can ask each other questions in here, we are all in the same classes. :)
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ya were all geniuses like that and always will be. lol 8)
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dude tyler, or anybody else, did you figure out how your gonna do your paper airplane for tomorrow?
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dude tyler, or anybody else, did you figure out how your gonna do your paper airplane for tomorrow?
i'm stealing your idea which just mine backwards and throwing it better
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dude tyler, or anybody else, did you figure out how your gonna do your paper airplane for tomorrow?
I always found a scrunched up paper ball flies much further than most paper aeroplanes, plus its easier to make! ;)
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I always found a scrunched up paper ball flies much further than most paper aeroplanes, plus its easier to make! ;)
genious! my dad showed me how to make a cool one, it is kind of tricky to throw though. :o
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i'm gone for two whole days and there are only two more posts on here :-\
what's that??
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sorry dude i have been a little busy/lazy :P
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hey guys are we still putting our squad stuff on our shirts ???
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hey guys are we still putting our squad stuff on our shirts ???
i vote we tell furgy and he buys a bleach pen so we can all do it in class and any other ap chem kids can do it with him later and stuff...
how did everyones come out?
mine came out quite exceptionally i think
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mine came out really well. :o bleach pen ftw!
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yes we use a bleach pen on the shirts to write in the AP Chemistry Squad thing and it will be straight lines and all that as opposed to using bleach and a qtip or something
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yes we use a bleach pen on the shirts to write in the AP Chemistry Squad thing and it will be straight lines and all that as opposed to using bleach and a qtip or something
hey, you're finally on! what's up with the negative snack business? i posted in the mod suggestion forum and they said that if you post too much in the general forum, you get duked, but other than that it's just if someone is pissed at you.
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there, now you're at zero again. ;D
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there, now you're at zero again. ;D
bastard!
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wth? i gave you one so you are at zero now instead of -1
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wth? i gave you one so you are at zero now instead of -1
oh ok. i returned the favor
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do we have any idea of what we're going to write on our shirts tomorrow and in what fashion it will be in?
i'm going to bring some bleach if i have any at home
and you have to really lay on the bleach and give it about an hour or so but it def works lol :o
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alright sounds good. i was just going to write "AP Chemistry Squad Member [001]" if we can ever get those others to join then we should be an actual club. we'll have the shirts, so we must be a club right? all clubs have special shirts. :o
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alright sounds good. i was just going to write "AP Chemistry Squad Member [001]" if we can ever get those others to join then we should be an actual club. we'll have the shirts, so we must be a club right? all clubs have special shirts. :o
haha very true
these people keep taking tons of scooby snacks cuz i was confused about something and they didn't like it >:(
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your confusion confused everyone.
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your confusion confused everyone.
no it didn't cuz it was NOT equilibrium lol :)
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maybe your confusion didn't confuse everyone but H2 gas does not evolve from HCl solution like you said... or maybe people just hate you
anyone want to do that e.c. physics project with me... it's due thursday i think
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pffff! physics ec, im not going to do that because you can't do anything fun.
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pffff! physics ec, im not going to do that because you can't do anything fun.
have you asked her about filming one at our house so that we don't bring the fire hazard to school
the only restriction she put on it was no fire right?
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maybe your confusion didn't confuse everyone but H2 gas does not evolve from HCl solution like you said... or maybe people just hate you
anyone want to do that e.c. physics project with me... it's due thursday i think
i was thinking about the HCl Mg lab where it did produce the H2 gas lol :P
and sure i'll do that thing if you want to, i have a vague idea in mind already
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i was thinking about the HCl Mg lab where it did produce the H2 gas lol :P
and sure i'll do that thing if you want to, i have a vague idea in mind already
ah, that would make a lot more sense for the production of hydrogen gas
we need to run the plans by Tesdahl by tomorrow then... you have my number so give me a call and we can work on it tonight and/or tomorrow
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i was thinking about the HCl Mg lab where it did produce the H2 gas lol :P
and sure i'll do that thing if you want to, i have a vague idea in mind already
ah, that would make a lot more sense for the production of hydrogen gas
we need to run the plans by Tesdahl by tomorrow then... you have my number so give me a call and we can work on it tonight and/or tomorrow
ok, it's an idea i did freshman year that involved crushing a can so it's pretty wicked i must say, plus i have wood for the base and all that jazz
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you can't use fire, guns, napalm, hazardous chemicals or anything cool of that nature, so if you wanted to ask her about filming it and we use those things then im in
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sykes: hth do you have more snacks than me?
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sykes: hth do you have more snacks than me?
i agree
"you can't use fire, guns, napalm, hazardous chemicals or anything cool of that nature, so if you wanted to ask her about filming it and we use those things then im in"
napalm woulb be a nice touch ;D
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sykes: hth do you have more snacks than me?
not really sure because i gave you one today so you should have 3 or so... I guess I finally made somebody happy :)
just a wild guess, there's a good chance will took 1 of your snacks during the HCl controversy
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just a wild guess, there's a good chance will took 1 of your snacks during the HCl controversy
he def nabbed one of mine, even tho i was right
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yeah, probably. call tanillium and tell her sorry @$$ to get on.
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yeah, probably. call tanillium and tell her sorry @$$ to get on.
i won't be on for a couple hours cuz i gotta go to the choir thing :P but i'll be on at like 9-10 and later or so
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just a wild guess, there's a good chance will took 1 of your snacks during the HCl controversy
he def nabbed one of mine, even tho i was right
:o Ask a mod! I have never ever taken a scooby snack before from anyone (I was one of the people to give you a snack, syko!)!!! I don't care if you guys took mine last night, scooby snacks are the last thing on my mind.
Please read what lemonoman said:
The reaction is reversible. The WHOLE time you have an HCl-in-water mixture, I don't care what concentration it is...HCl molecules will be dissociating into H+ (as H3O+) and Cl- ... just as H+ and Cl- will be simultaneously recombining somewhere else. The EQUILIBRIUM that is set up comes to rest (as in, no change occurs...but the equilibrium exists) at a point where most (i.e. 99.7%) of the HCl molecules you put in are in dissociated form.
It is just one of those boring facts of chemistry that you'll have to learn, and accept it even if you don't yet understand it.
Here are some notes on this subject from the University of British Columbia : http://www.chem.ubc.ca/courseware/pH/. The notes under section 1 explain why it is an equilibrium very clearly. Hope this helps ;).
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haha. /rctrackstar ;D
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my apologies will, didn't mean to offend you in any way if i did... and thanks for the scooby
obviously you pissed somebody off though trevor
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my apologies will, didn't mean to offend you in any way if i did... and thanks for the scooby
obviously you pissed somebody off though trevor
that is pretty funny, he obviously pissed off more than one person.
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i wish i had a scooby snack :'( but whatever i guess it is good that i haven't pissed anybody off yet
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i wish i had a scooby snack :'( but whatever i guess it is good that i haven't pissed anybody off yet
you wish?
... you have 2.
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wth? grrr! you have more snacks than me! :P
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did you guys give the snacks ??? cuz the last time i was on today i didn't have any
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i think i gave you 1 but i thought you knew about that
yay, over 100 posts! Hello full member status ;D
and nice avatar there mrdeadman, very appropriate for your name... i take it you side with modern arts?
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i think i gave you 1 but i thought you knew about that
yay, over 100 posts! Hello full member status ;D
and nice avatar there mrdeadman, very appropriate for your name... i take it you side with modern arts?
congrats! wait till you hit the 200 mark
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yay only 27 more post till i have 100 ::) why do you care so much ???
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I am retarded at chemistry i need help
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ionization enery. wtf?
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the energy required to change the element to an ion, the energy it takes to "steal" an electron from an atom.
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ok cool man. this is a bonding question. what is an easy way to figure out the shape of the bonds?
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what do you mean? you mean straight or bent or tetrahedral?
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yeah, yeah!!
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drawing the lewis structure actually works well. remember the nonbonded pairs of electrons.
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do you just take the lewis dot structure and the amount of sides is the shape? kinda, sorta?
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yeah, but you have to remember the VSEPR theory. nonbonded pairs take up more space than atoms do. that's why water's shape is "bent." you guys don't have those model kits where you build the molecules? those help a lot.
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so if a central atom has say nonbonded pairs on the top, then the other pairs are pushed down?
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then the other atoms are pushed down, that's why NH3 is trigonal pyramidal.
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thanks man. i wont ask u anymore questions. i know u have to get going.
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you can ask more questions, i can answer them when i get back, either that or if you want to go that's cool too, also, you can post in teh high school forum and they will answer you stuff too.
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the energy required to change the element to an ion, the energy it takes to "steal" an electron from an atom.
I was taught that the ionization energy is the minimum energy required to remove one electron from each atom in one mole of gaseous atoms of that element at 298K and 1 atm.
yeah, but you have to remember the VSEPR theory.
Except in cases like PH3. YOu have to think about the sizes of the orbitals of the orbitals involved in bonding etc.
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I was taught that the ionization energy is the minimum energy required to remove one electron from each atom in one mole of gaseous atoms of that element at 298K and 1 atm.
what i have been taught is exactly what mrdeadman said, that the ionization energy was the energy required to remove an electron/steal an electron thus making it an ion which is that same as the wikipedia definition
here's the address if you want to read it http://en.wikipedia.org/wiki/Ionization_energy
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what i have been taught is exactly what mrdeadman said, that the ionization energy was the energy required to remove an electron/steal an electron thus making it an ion which is that same as the wikipedia definition
here's the address if you want to read it http://en.wikipedia.org/wiki/Ionization_energy
That is a perfectly acceptable general idea of what the ionization energy means, but as a definition it is a precise measurement that has to have a standard, and the one used is normally the one I mentioned. Otherwise, the ionization energy would be impractically low to work with! For example, the first ionization energy of an atom of Barium would be 0.00000000000000000083508 Joules!
Thats why they use moles. ;)
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hey guys i finally hit the three star status, yay now i finally join the ranks :D
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That is a perfectly acceptable general idea of what the ionization energy means, but as a definition it is a precise measurement that has to have a standard, and the one used is normally the one I mentioned. Otherwise, the ionization energy would be impractically low to work with! For example, the first ionization energy of an atom of Barium would be 0.00000000000000000083508 Joules!
Thats why they use moles. ;)
the guy we are helping out is in general chem and you don't need to really work with what you're saying until college. so in order for him to understand it to general chem standards, the definition he should use is the one we gave him. ;)