June 01, 2020, 09:37:55 AM
Forum Rules: Read This Before Posting


Topic: Predicting products for single replacement  (Read 2527 times)

0 Members and 1 Guest are viewing this topic.

Offline tvis23089

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Predicting products for single replacement
« on: April 06, 2017, 08:19:31 PM »
I need help predicting the products for: __Br2+__Kl---->

I cant figure out how to use the: A+BC -----> AC+B method
« Last Edit: April 06, 2017, 09:10:55 PM by tvis23089 »

Offline Arkcon

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7360
  • Mole Snacks: +533/-147
Re: Predicting products for single replacement
« Reply #1 on: April 06, 2017, 08:40:37 PM »
Its hard to do this sort of problem with no background at all.  So usually, instructors don't give it with no background at all.  You've left space for balancing, but you also need to know what reaction can happen.  What's possible?  What is a single replacement reaction?

Sorry to answer a question with a question, but that's what we do here.  We give hints to help you solve for yourself.  That's all in the Forum Rules{click}.  You agreed to these rules as a condition of signing up for our forum, and they apply to you, whether you agree with them or not, or even if you're unaware of them. 
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline tvis23089

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Re: Predicting products for single replacement
« Reply #2 on: April 06, 2017, 08:46:48 PM »
Sorry for not giving any background, but I know what a single replacement is, I know how to balance the equation, i'm just not sure what the answer would be if I did these steps.  ??? 

Offline tvis23089

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Re: Predicting products for single replacement
« Reply #3 on: April 06, 2017, 08:49:41 PM »
My teacher taught me that we are supposed to predict these products by using the A + B ---> AC+B method, but I am not sure how to do it for this type of equation.

Offline Arkcon

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7360
  • Mole Snacks: +533/-147
Re: Predicting products for single replacement
« Reply #4 on: April 06, 2017, 08:52:22 PM »
O...kay.  So.  What is a single displacement reaction, and how does it apply in this case.  If you can balance, then do so, if you can't, then save it for later, or don't mention it.  What is possible to happen?  Can you think of a random change, if there's no example of a single displacement reaction in your book?
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline Arkcon

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7360
  • Mole Snacks: +533/-147
Re: Predicting products for single replacement
« Reply #5 on: April 06, 2017, 08:53:21 PM »
My teacher taught me that we are supposed to predict these products by using the A + B ---> AC+B method, but I am not sure how to do it for this type of equation.

Not the best example, but try it anyway.  But you really should look for a better one.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline tvis23089

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Re: Predicting products for single replacement
« Reply #6 on: April 06, 2017, 08:57:11 PM »
I am supposed to learn this type of reaction because it will be on my test tomorrow, I have tried different types of methods and I also looked in my chemistry book but I still do not know how to solve this problem. Any advice? (sorry I didn't know the rules before I came here, I just joined today)

Offline XeLa.

  • Regular Member
  • ***
  • Posts: 62
  • Mole Snacks: +9/-2
  • Gender: Male
Re: Predicting products for single replacement
« Reply #7 on: April 06, 2017, 10:59:16 PM »
Do you know what a single ion displacement reaction is? If not, what do you think the name suggests?

So your teacher wants you to learn how to write this reaction as A + BC :rarrow: C + BA...what do you think A, B, and C is for this reaction?

Like Arkcon said, you need to show your working before we can give you any further help.
« Last Edit: April 06, 2017, 11:09:52 PM by XeLa. »

Offline tvis23089

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Re: Predicting products for single replacement
« Reply #8 on: April 06, 2017, 11:41:33 PM »
This is what I got Br2+2KI--->2KBr+I2 when I solved it

The only problem is that I don't know if my teacher meant it to be a KL or KI

Offline XeLa.

  • Regular Member
  • ***
  • Posts: 62
  • Mole Snacks: +9/-2
  • Gender: Male
Re: Predicting products for single replacement
« Reply #9 on: April 07, 2017, 12:20:26 AM »
This is what I got Br2+2KI--->2KBr+I2 when I solved it

The only problem is that I don't know if my teacher meant it to be a KL or KI

That looks correct - the equation is balanced and that's a single ion displacement reaction. Do you know of any element with the symbol 'L'?

Offline tvis23089

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Re: Predicting products for single replacement
« Reply #10 on: April 07, 2017, 12:30:46 AM »
yes

Offline XeLa.

  • Regular Member
  • ***
  • Posts: 62
  • Mole Snacks: +9/-2
  • Gender: Male
Re: Predicting products for single replacement
« Reply #11 on: April 07, 2017, 12:33:35 AM »
Which element would that be exactly?

Offline tvis23089

  • New Member
  • **
  • Posts: 7
  • Mole Snacks: +0/-0
Re: Predicting products for single replacement
« Reply #12 on: April 07, 2017, 12:35:37 AM »
I don't think there is an element named L

Offline XeLa.

  • Regular Member
  • ***
  • Posts: 62
  • Mole Snacks: +9/-2
  • Gender: Male
Re: Predicting products for single replacement
« Reply #13 on: April 07, 2017, 12:42:22 AM »
I don't think there is an element named L

That means that it must be 'I', right? Iodine has the symbol 'I'.

We know that Br2 + 2KI :rarrow: 2KBr + I2, does iodine fit this description?

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 25776
  • Mole Snacks: +1686/-400
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Predicting products for single replacement
« Reply #14 on: April 07, 2017, 02:51:29 AM »
Note: chemistry is not only about finding whether the reactants given fit the scheme, it is also about knowing properties of elements and substances. Halogens are known for being able to replace their own kind according to reactivity - with F2 being the most reactive (and being able to replace all other halogens) an I2 being the least reactive (and being replaced by all other halogens). This is where the periodic table comes handy, as the reactivity gets lower when you travel down the group.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Sponsored Links