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Chemistry AS2 CCEA 17th June 2014

Somebody503

Hey guys what did we think??

Reply 1

Frank the Tankk

12

Definitely harder than past years. Everyone in my school came out looking rather forlorn.
Question with diols? What the ****.

Reply 2

ehhwot

Basically had to draw the ester and the carboxylic acid symmetrically as there were 2 OH groups, if I'm right that is

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Reply 3

Somebody503

OP

Yes I definitely think harder than any past paper! Did anyone get an ans for the one asking for the amount of energy released for every kg of CO2 released?
Also my multiple choice were BCBCDBBACA if anyone has theirs to compare :L :L

Reply 4

Dj-in-da-house

8

Original post by Somebody503

Yes I definitely think harder than any past paper! Did anyone get an ans for the one asking for the amount of energy released for every kg of CO2 released?
Also my multiple choice were BCBCDBBACA if anyone has theirs to compare :L :L

i got a lot of B's and C's and maybe 2 A's. do you remember what question you put D for?

Reply 5

Dj-in-da-house

8

I thought the multiple choice was good. Rest of the paper was okay but the last few pages about drawing the structures was hard :/

Reply 6

Sheepish153

2

Original post by Somebody503

Yes I definitely think harder than any past paper! Did anyone get an ans for the one asking for the amount of energy released for every kg of CO2 released?
Also my multiple choice were BCBCDBBACA if anyone has theirs to compare :L :L

Can't remember my answer, but I know I used the fact that there were 4 moles of CO2 released, when the energy released was as said, and then figured how much energy would be released when there was 1kg CO2 released. Sound familiar?

Reply 7

Somebody503

OP

Original post by Sheepish153

Can't remember my answer, but I know I used the fact that there were 4 moles of CO2 released, when the energy released was as said, and then figured how much energy would be released when there was 1kg CO2 released. Sound familiar?

Ah yes i used the same method! So hopefully same answer!

Reply 8

Somebody503

OP

Original post by Dj-in-da-house

i got a lot of B's and C's and maybe 2 A's. do you remember what question you put D for?

My D was for q.5 i said 1-bromopropane and potassium cyanide mix to give c4h7n

Reply 9

Aine Black

Worst test ever, like I literally couldn't answer majority of the paper apart from multiple choice that was nice

Reply 10

Somebody503

OP

For the multiple choice q.9 i wasnt sure if it was a free radical substitution or a nucleophilic substitution??

Reply 11

Frank the Tankk

12

Original post by Somebody503

For the multiple choice q.9 i wasnt sure if it was a free radical substitution or a nucleophilic substitution??

I thought it was elimination...because H2 was eliminated.

Reply 12

A1d9a9m7

1

Original post by Somebody503

For the multiple choice q.9 i wasnt sure if it was a free radical substitution or a nucleophilic substitution??

What was the question?

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Reply 13

Frank the Tankk

12

Original post by Dj-in-da-house

i said electrophillic addition lol. some people in my class put free radical substitution but i dont know the right answer!

I thought it would be too but that doesn't explain the gain of 69...surely it would gain 71 in mass if it was addition?

Reply 14

Dj-in-da-house

8

Original post by Somebody503

For the multiple choice q.9 i wasnt sure if it was a free radical substitution or a nucleophilic substitution??

is this about the chlorine being added and increased the mass by 69 ...i thot that was electrophillic addiction lol

Reply 15

Dj-in-da-house

8

Original post by Frank the Tankk

I thought it would be too but that doesn't explain the gain of 69...surely it would gain 71 in mass if it was addition?

thats what i thought too but i then i somehow told myself that 2 hydrogens are taken off :/

Reply 16

Sheepish153

2

Original post by Dj-in-da-house

is this about the chlorine being added and increased the mass by 69 ...i thot that was electrophillic addiction lol

But 71=rfm of chlorine x2 ie two Cl atoms added, 3 H atoms lost?

Reply 17

A1d9a9m7

1

Original post by Dj-in-da-house

is this about the chlorine being added and increased the mass by 69 ...i thot that was electrophillic addiction lol

Same i put electrophilic addition, I think that's right

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Reply 18

Somebody503

OP

Who knows :L the molecular mass had increased by 69... so i thought cl2 had been added on and 2 hydrogens removed but im not sure what thats called :L