You are Here: Home

# Edexcel IAL Chemistry (WCH06/01) Chemistry Laboratory Skills II - 10th May 2016

Announcements Posted on
Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter 24-10-2016
1. Hi all
couldnt find a thread on this so decided to create one hows prep?
2. I have a question for calculating enthalpy changes when do we consider the mass of the solid added to the solution? when do we consider just the mass of the solution? and when do we consider the combined mass? In the equation Q= mc(deltaT)
3. Bump

Posted from TSR Mobile
4. Bumping again need help 😯😢

Posted from TSR Mobile
5. Well no help yet I will attach an example question

Posted from TSR Mobile
Attached Images

6. (Original post by Saad69)
I have a question for calculating enthalpy changes when do we consider the mass of the solid added to the solution? when do we consider just the mass of the solution? and when do we consider the combined mass? In the equation Q= mc(deltaT)
we only take the mass of the solution. if the other reactant added was a solid we do not consider it but if it was also a solution we add the solutions up (their volumes)
idk hope that was clear
7. (Original post by pondsteps)
we only take the mass of the solution. if the other reactant added was a solid we do not consider it but if it was also a solution we add the solutions up (their volumes)
idk hope that was clear
I got the first part saying that only solid masses are considered could u explain the 2nd part again about volumes

Posted from TSR Mobile
8. (Original post by Saad69)
I got the first part saying that only solid masses are considered could u explain the 2nd part again about volumes

Posted from TSR Mobile
wait no u got me wrong! i meant when in the rule it is m*c* delta T. so for the mass in the rule we use the volume of the solution and put it as it is for the mass since we assume that the density is 1.. whenever given in the question mass of solid, forget about it in the rule since we only consider solutions..
eg. 5g of zinc added to 10cm3 of sodium hydroxide
the mass used in mcdeltaT is 10

10cm3 of sodium hydroxide added to 50 cm3 of hcl
the mass used here is 60 cm3
9. We consider the combined mass when we're adding something aqueous to another anquous reagent. Or else we just consider the mass or the aqueous reagent, since it has the most significant heat capacity ( absorb most of the heat)

Posted from TSR Mobile
10. :3 so how's prep everyone? Chem's pretty good for me but physics is giving me a hard time

Posted from TSR Mobile
11. [QUOTE=-Akuma-;64672505]:3 so how's prep everyone? Chem's pretty good for me but physics is giving me a hard time

Posted from TSR Mobile[/QUOTE
Same chem is going well, but biooo ugh I hate it. My exam is today
12. Good luck with bio!

Posted from TSR Mobile
13. Good luck to you
14. (Original post by -Akuma-)
:3 so how's prep everyone? Chem's pretty good for me but physics is giving me a hard time

Posted from TSR Mobile
same here! physics is the worst!
15. (Original post by Nethmioysters)
same here! physics is the worst!
physics unit 3 is not that tough for me ask me any doubts u may have from it
16. (Original post by Saad69)
physics unit 3 is not that tough for me ask me any doubts u may have from it
thanks! ill ask you, when i come across some of my doubts!
17. Um can anybody tell me why we add saturated NaCl solution during purification of cyclohexene, which is made from cyclohexanol?

Posted from TSR Mobile
18. (Original post by -Akuma-)
:3 so how's prep everyone? Chem's pretty good for me but physics is giving me a hard time

Posted from TSR Mobile
Ikr same, physics is s*** 😱

Posted from TSR Mobile
19. why this thread so dead xD ? the bio thread was on fire this morning
20. (Original post by -Akuma-)
why this thread so dead xD ? the bio thread was on fire this morning
Ahahha Ike, any questions? Gonna start studying in an hour😬

Posted from TSR Mobile

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register

Updated: May 17, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

## Make your revision easier

Can you help? Study Help unanswered threadsStudy help rules and posting guidelines

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.