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OCR Gateway Chemistry 24th May 2012 C1 C2 C3

How was it? Does anyone have an unofficial mark scheme?

For the thread on the OCR Gateway Biology 21st May exam--> http://www.thestudentroom.co.uk/showthread.php?t=2006071

OCR Gateway Physics 30th May exam -->http://www.thestudentroom.co.uk/showthread.php?t=2016921&p=37840357#post37840357

(edited 11 years ago)

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Reply 1

L'Evil Fish

So easy!!! Hoping for full UMS!!! :biggrin:

Reply 2

bobbricks

Same!

But there was one question I wasn't too sure about- the question on why drainpipes are used for water? I wrote pipes are rigid and do not dissolve in water

Reply 3

alisonr

Original post by bobbricks

Same!

But there was one question I wasn't too sure about- the question on why drainpipes are used for water? I wrote pipes are rigid and do not dissolve in water

I put that as well:P

Reply 4

L'Evil Fish

Original post by bobbricks

Same!

But there was one question I wasn't too sure about- the question on why drainpipes are used for water? I wrote pipes are rigid and do not dissolve in water

I wrote about water not wearing it away and corrosion/erosion... I said it was low density so lightweight :/ oops..

Reply 5

milworthy

Original post by bobbricks

Same!

But there was one question I wasn't too sure about- the question on why drainpipes are used for water? I wrote pipes are rigid and do not dissolve in water

Wait, what section was that in? Because I think I might have misread it-or skipped it entirely? I cannot remember anything about drains at all-just about polystyrene cups.

(edited 11 years ago)

Reply 6

bobbricks

Original post by milworthy

Wait, what section was that in? Because I think I might have misread it-or skipped it entirely? I cannot remember anything about drains at all-just about polystyrene cups.

It was in C2 and there was a picture of a drainpipe. It asked why the polymer used was suitable for its purpose or something like that (maybe someone else could elaborate) :smile:

Reply 7

sunshinebeem

omgg this exam was great! Hoping not to jinx it but I think I did quite well :smile:

Reply 8

milworthy

Original post by bobbricks

It was in C2 and there was a picture of a drainpipe. It asked why the polymer used was suitable for its purpose or something like that (maybe someone else could elaborate) :smile:

Ok, like how many marks was it? Was it the advantages of steel over aluminium?

(edited 11 years ago)

Reply 9

bobbricks

Original post by milworthy

Ok, like how many marks was it? Was it the advantages of steel over aluminium?

No it was a few questions before it...It was two marks. :cool:

Reply 10

milworthy

Original post by bobbricks

No it was a few questions before it...It was two marks. :cool:

And was that the only question, I am scared I missed a double page. Wait were you doing foundation or higher?

Reply 11

bossun

Hii guys. My friends found the paper hard :rolleyes:

But i found it alright. What did you guys say about which fuel to choose? and among the last question why use a paraffin stove :wink:

Reply 12

bobbricks

Original post by milworthy

And was that the only question, I am scared I missed a double page. Wait were you doing foundation or higher?

Higher. And you? I'm sure you didn't miss it- you probably don't remember it. I have some friends who completely forget all of the questions after they leave the exam hall. :wink:

If someone can provide a list of questions in the C2 section, you might be able to spot whether you missed out some questions. Unfortunately, I don't remember all of those questions. :smile:

Reply 13

bobbricks

Original post by bossun

Hii guys. My friends found the paper hard :rolleyes:

But i found it alright. What did you guys say about which fuel to choose? and among the last question why use a paraffin stove :wink:

I said they should use ethanol since it showed the highest temperature change and had the highest mass of fuel burned so it released the most energy.

Reply 14

L'Evil Fish

Original post by bobbricks

I said they should use ethanol since it showed the highest temperature change and had the highest mass of fuel burned so it released the most energy.

No, it was paraffin because per unit which I said could be 0.6g it released 2.5x more energy than ethanol and petrol... So unless it was 2.5x more expensive it is the most sensible choice. :smile:

Reply 15

MangoFreak

It was very easy :awesome:

Like 10 marks for balancing equations :biggrin:

Reply 16

L'Evil Fish

For the Caliometric Experiment... When it asked for energy transfer... Of temperature x s.h.c x mass... Is it the mass of water or mass of fuel? I used the mass of water...

Reply 17

MangoFreak

Original post by bobbricks

I said they should use ethanol since it showed the highest temperature change and had the highest mass of fuel burned so it released the most energy.

Paraffin had the greatest ratio between temperature change and mass combusted, meaning it released the most energy :smile:

Reply 18

MangoFreak

Original post by shadab786ahmed

For the Caliometric Experiment... When it asked for energy transfer... Of temperature x s.h.c x mass... Is it the mass of water or mass of fuel? I used the mass of water...

That's right. The SHC is the energy required to raise 1g of water by 1 degree, so you have to multiply it by 100g to get the energy transferred into 100g of water. But because the mass of the fuel consumed was 0.6g, and the answer needed to be J/g, you needed to multiply the energy transfer by 1.66...

Reply 19

bobbricks

Original post by shadab786ahmed

No, it was paraffin because per unit which I said could be 0.6g it released 2.5x more energy than ethanol and petrol... So unless it was 2.5x more expensive it is the most sensible choice. :smile:

So are you saying you worked out the energy released per gram for each fuel?