Edexcel A2 Chemistry 6ch04/05 JUNE 2015

Original post by MoHoosen9167

0.56 because pp of n2o4 was 0.4x2 and pp of no2 was 0.6x2 and then Kp was 0.555555555

Same.

Reply 1141

cbfks

Advantages and disadvantages of the 2 processes:

Palm oil:
+: Green as carbon neutral
-: Oil obtained from food sources is unethical
Coffee:
+: ?
-: Used methanol which is obtained from unsustainable crude oil

Reply 1142

Original post by Undisclosed 15

Nope. Ffs. How many marks do you think I've lost?

Posted from TSR Mobile

It was a 5 mark question, wasn't it? Not many man, I reckon 2 maximum.

Reply 1143

Undisclosed 15

18

Original post by Callum_Stewart

It was a 5 mark question, wasn't it? Not many man, I reckon 2 maximum.

Ye hopefully on 2. Thanks for the help

Posted from TSR Mobile

Reply 1144

Undisclosed 15

18

Original post by cbfks

Advantages and disadvantages of the 2 processes:

Palm oil:
+: Green as carbon neutral
-: Oil obtained from food sources is unethical
Coffee:
+: ?
-: Used methanol which is obtained from unsustainable crude oil

But don't you also have to react palm oil with methanol

Posted from TSR Mobile

Reply 1145

sj97

Original post by Callum_Stewart

It was a 5 mark question, wasn't it? Not many man, I reckon 2 maximum.

How many marks do you think it takes for full UMS? Usually around 82, isn't it? But since this was more difficult...?

Reply 1146

Original post by cbfks

Advantages and disadvantages of the 2 processes:

Palm oil:
+: Green as carbon neutral
-: Oil obtained from food sources is unethical
Coffee:
+: ?
-: Used methanol which is obtained from unsustainable crude oil

THIS QUESTION THO :frown:

Palm Oil adv: Can produce large scale bio oil, as opposed to the pathetic amounts from used coffee grounds
disadv: Lots of energy and water needed to run the plantation
Coffee grounds adv: not very wasteful, as they were just going to be thrown out anyway
Disadv: very hard to produce large amounts + wasted solvent and methanol
I concluded by saying the palm oil is better as a renewable source of energy.

Reply 1147

cbfks

Original post by Undisclosed 15

But don't you also have to react palm oil with methanol

Posted from TSR Mobile

Maybe I got them mixed up! I think I must have put 10-15% yield was low.

Reply 1148

blueynuey1

2

Please vote on difficulty here:

Poll: http://strawpoll.me/4593433

Reply 1149

Original post by sj97

How many marks do you think it takes for full UMS? Usually around 82, isn't it? But since this was more difficult...?

Yeah, I'm thinking lower too. God knows, maybe 80, 79?

Reply 1150

laurenjjj

8

How many marks for an A do you think for this paper? I've made so many stupid mistakes grr :frown:

Reply 1151

alexb104

Coffee
Pros: Coffee has already been used and so you are recycling
Cons: Methanol has to be used which is not renewable

Palm
Pros: Renewable because it's from trees.
Cons: Is only grown in tropical climates so there needs to be transportation which may not be green.

Reply 1152

Wahid1

7

Someone pls pls pls pls do the unofficial mark scheme now

Posted from TSR Mobile

Reply 1153

Stillreading

14

Original post by cbfks

Advantages and disadvantages of the 2 processes:

Palm oil:
+: Green as carbon neutral
-: Oil obtained from food sources is unethical
Coffee:
+: ?
-: Used methanol which is obtained from unsustainable crude oil

Do you think an advantage of the coffee one is that is used waste products and not new plants is ok? I think my disadvantage was that the % of oil obtained was low but yours seems more reasonable.

Reply 1154

Wahid1

7

Grade boundary predictions:
A: 60
B:54
C:48

How much more unorthodox can a paper get?!?

Thank you Edexcel for recruiting Satan as the author for Unit 4.

Posted from TSR Mobile

Reply 1155

sj97