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Topic: phase change practice with other variables  (Read 18568 times)

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Offline mr cool

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Re: phase change practice with other variables
« Reply #15 on: February 05, 2009, 04:30:47 PM »

Offline ARGOS++

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Re: phase change practice with other variables
« Reply #16 on: February 05, 2009, 04:43:31 PM »

Offline mr cool

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Re: phase change practice with other variables
« Reply #17 on: February 05, 2009, 04:55:00 PM »

Offline macman104

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Re: phase change practice with other variables
« Reply #18 on: February 05, 2009, 05:02:01 PM »
Quote from: reezyfbaby link=topic=30970.msg117918#msg117918 date=1233870900[b
First:[/b] don't i use half of 4.184 because, i start in ice?
No you don't.  Were you taught that, or did you read that somewhere? 

Also, I really do not recommend using an online conversion tool unless you can convert the units by hand first.  Almost all work in chemistry requires being able to convert units, or use dimensional analysis (which is what you can use to convert units).  If you are not comfortable with those techniques it is going to make your life only harder later on (even later in the semester).

Offline mr cool

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Re: phase change practice with other variables
« Reply #19 on: February 05, 2009, 05:06:13 PM »
no im pretty good at dimensional analysis it's just that i was frustrated so i just took the easy way out :(

Offline ARGOS++

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Re: phase change practice with other variables
« Reply #20 on: February 05, 2009, 05:08:32 PM »

Offline mr cool

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Re: phase change practice with other variables
« Reply #21 on: February 05, 2009, 05:14:44 PM »

Offline ARGOS++

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Re: phase change practice with other variables
« Reply #22 on: February 05, 2009, 05:20:55 PM »

Dear reezyfbaby;

Sorry, - Yes!

Please do it only stepwise!  Please start with First: .

Good Luck!
                    ARGOS++


Offline mr cool

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Re: phase change practice with other variables
« Reply #23 on: February 05, 2009, 05:25:49 PM »

Dear reezyfbaby;

Sorry, - Yes!

Please do it only stepwise!  Please start with First: .

Good Luck!
                    ARGOS++



oh you want me to do #1 first ? oki...

85000 kj / 4.1845 = 20313


P.S. Here is another problem i was trying in the meantime...

What is the final temperature of a 50.00g sample of ice at -10.00*C if it is exposed to 59.75 J of energy and remains ice?

(.5 cal/g)(50.00g)(F- -10.00*C) = 250 cal
25 cal (F - -10*C) =250 cal
25 cal(F) + -250 cal = 250 cal
-225 cal = 250cal
250cal / -225 cal = 0.9 *C 

?

Offline ARGOS++

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Re: phase change practice with other variables
« Reply #24 on: February 05, 2009, 05:34:18 PM »

Offline mr cool

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Re: phase change practice with other variables
« Reply #25 on: February 05, 2009, 05:36:28 PM »

Offline ARGOS++

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Re: phase change practice with other variables
« Reply #26 on: February 05, 2009, 05:44:16 PM »

Offline mr cool

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Re: phase change practice with other variables
« Reply #27 on: February 05, 2009, 05:45:37 PM »
4563 left?

Offline ARGOS++

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Re: phase change practice with other variables
« Reply #28 on: February 05, 2009, 05:50:32 PM »

Offline mr cool

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Re: phase change practice with other variables
« Reply #29 on: February 05, 2009, 05:52:32 PM »

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