Edexcel IAL Chemistry Unit 03B - 10th of May, 2017

dexcel_Chemistry_Unit_3B_-_Laboratory_Techniques_-_Test_for_Ions

I found this https://www.thestudentroom.co.uk/wiki/Revision :colone:

Reply 6

https://drive.google.com/file/d/0B6Ws7vka_m2eYVZLWGdPNUpXNjQ/view
My teacher gave this out for us, hope it helps!

Reply 7

Can someone explain why there is an increase in the temperature here even though the reaction is endothermic? And I basically don't understand the shape of the graph at all...
The paper is May 2015 unit 3.

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Reply 8

Can someone explain why there is an increase in the temperature here even though the reaction is endothermic? And I basically don't understand the shape of the graph at all...

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The reaction is endothermic, so the reaction mixture cools quickly at the start to drop below room temperature. Then after the reaction is over, the temperature of the product mixture will rise back up as heat energy from the room is transferred to it. Leave it for long enough, and the solution will reach room temperature again.

It's like leaving a cube of ice in a room: it will melt, and its water will heat to room temperature because air molecules that collide with the liquid molecules will transfer some of their kinetic energy to the liquid molecules, and thus heat up the liquid.

That's the answer, by user @K-Man_PhysCheM

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Reply 9

Alexander313

2

Original post by Whitefeather

https://drive.google.com/file/d/0B6Ws7vka_m2eYVZLWGdPNUpXNjQ/view
My teacher gave this out for us, hope it helps!

really helpful ,thanks

Reply 10

isnt the exam on the 9th?

Reply 11

Micrometer101

1

The exam is on the 9th

Reply 12

Daiski

6

Hello, I'm doing unit 3B tomorrow too! I haven't studied unit 1 or 2 though.. i had to study for other exams :/
Does anyone have any tips for some quick revision or anything like that? I don't expect to get anything above a C :ashamed:

Reply 13

Well I would say just do past papers because I studied unit 1 and 3. It is mainly laboratory skills and memorisations

Reply 14

Original post by Daiski

Hello, I'm doing unit 3B tomorrow too! I haven't studied unit 1 or 2 though.. i had to study for other exams :/
Does anyone have any tips for some quick revision or anything like that? I don't expect to get anything above a C :ashamed:

Learn the process of purifying an organic liquid. It always comes in the paper. Revise enthalpy changes and you have to know the test for anions and cations and some imp compounds. Revise test for organic compounds as well. And last of all, do past papers. Good luck :smile:

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Reply 15

Daiski

6

Original post by Droneon

Learn the process of purifying an organic liquid. It always comes in the paper. Revise enthalpy changes and you have to know the test for anions and cations and some imp compounds. Revise test for organic compounds as well. And last of all, do past papers. Good luck :smile:

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Thank you so much! Will do :biggrin:

Reply 16

Original post by Daiski

Thank you so much! Will do :biggrin:

Anytime

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Reply 17

azrah vakil

if u learn the tests for anion cations gases and flame tests as well as tests for organic liquids you will score 15 to 20 marks just like that so make sure u know them!

Reply 18

Micrometer101

1

I seem to have a problem with Hess' diagram. Does anyone have some advice or anything that can help me?

Reply 19