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WJEC AS Chemistry CH2 June 2nd 2015

Hey, guys. I've decided to make threads for the PH2 and CH2 exams since the PH1 and CH1 exams are (thankfully) over now.

Is preparation going well? Has everyone learnt all of those mechanisms, reactions/tests? There's a lot of content in CH2, probably substantially more than in CH1, so if you guys have any questions and/or are struggling with a certain topic, let me know!

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Reply 1

HG_07

Is there any chance you could list the mechanisms we need to know please as I keep getting confused? :/

Reply 2

Ser_

-Photochlorination of methane
-Electrophilic addition
-Nucleophilic substitution

... I think that's all?

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Reply 3

HG_07

Completely forgot about photo chlorination of methane!! Thanks!

Reply 4

matthewdjones

anyone got CH2 2009 January paper?

Reply 5

fishhasgills

How are people feeling about this paper? I'm hoping it will be kinder than CH1 was. Lots of organic chemistry please.

Reply 6

HG_07

Think it will be Okay. Tbh you can't go really wrong in ch2 provided you've memorised the reactions Etc

Reply 7

SoThisIsStresful

bit late but what tests do we need to know. i never found a solid list so have been learning the ones i found in past papers...

Reply 8

Jack1066

That test completely dicked me over.

By far the hardest exam I've done so far

Reply 9

anomyous

it was hard but i thought it was okay overall

Reply 10

dyrghrdegbyu

it was a hard paper i thought

Reply 11

Fortauna

I thought that was brilliant :biggrin:

Reply 12

Ser_

Thought the exam was lovely! Only questions that tripped me up were the electron density in the bond ones and the one about Amonia and ethane.

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Reply 13

fishhasgills

Original post by Ser_

Thought the exam was lovely! Only questions that tripped me up were the electron density in the bond ones and the one about Amonia and ethane.

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Exactly the same.

Reply 14

Questioner1234

Original post by Ser_

Thought the exam was lovely! Only questions that tripped me up were the electron density in the bond ones and the one about Amonia and ethane.

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Same apart from the only real dodgy question was the electron density question

Reply 15

Revenation

How do you go about doing the empirical formula question and calculating the amount of Carbon present in Acid F? Couldn't figure it out for the life of me..

Reply 16

Questioner1234

100 UMS 70/71 out of 80

Reply 17

Questioner1234

Original post by Revenation

How do you go about doing the empirical formula question and calculating the amount of Carbon present in Acid F? Couldn't figure it out for the life of me..

Find mol of carbon present in co2 x12 gives like 0.48ish or something. Then 0.6something for oxygen. Then empirical formula was c2o2h3

Reply 18

Revenation

Original post by Questioner1234

Find mol of carbon present in co2 x12 gives like 0.48ish or something. Then 0.6something for oxygen. Then empirical formula was c2o2h3

Sorry, im trying it now, so basically, Mol = Mass/Mr,
The mass of Co2 was 1.79g,
So 1.79/44 = 0.407 moles of Co2.

How do you get 0.48? Am I barking up the wrong tree here?