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OCR B (Salters) F332 Tuesday 4th June 2013 Exam Discussion (Now Closed)

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omg guys do the specimen paper- I swear I thought had done it before because one 1 questions from that pop up in a few papers

good idea xD

is there a markscheme?

Reply 681

Bridget Jones

Original post by Whostolemycookie

300/100000= 0.0030%
380/100000=0.0038%
The difference between the two is 0.0008
But the ms says 0.008 I don't get it tbh either :frown:

Original post by super121

You divided by 100,000 instead of 10,000

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Original post by usycool1

The difference is 80ppm (380 - 300).

Convert 80ppm to a percentage and that's your answer. :smile:

Thank you! I get it, I have no idea why I didn't do that :s-smilie:

and only couple more hours left :facepalm:

Reply 682

Whostolemycookie

Original post by CoolRunner

can you oxidise a ketone?

Yes, Secondary alcohols are heated to oxidise a ketone

Reply 683

abzy1234

Original post by Whostolemycookie

Yes, Secondary alcohols are heated to oxidise a ketone

You can't oxidise ketone's further though :smile:

Reply 684

cheetahs56

What page is Jan 2013 on guys? Sorry for asking :colondollar:

Reply 685

Whostolemycookie

Original post by abzy1234

You can't oxidise ketone's further though :smile:

Nope, and you can't oxidize tertiary alcohols

Reply 686

abzy1234

Original post by Whostolemycookie

Nope, and you can't oxidize tertiary alcohols

Yup, as they don't have a hydrogen atom on the carbon atom to which the -OH group is attached to :smile:

Reply 687

Bridget Jones

Sorry, but can anyone explain this to me please?

1370339175795.jpg31.8KB

Reply 688

Bow Tie

Original post by Whostolemycookie

Yes, Secondary alcohols are heated to oxidise a ketone

Secondary alcohols are oxidised to ketones but not oxidised from ketones. The Ketone is a product. Then there are not more hydrogens attached to the carbon attached to the OH group so no more oxidation can occur.

Reply 689

Whostolemycookie

Original post by nivvy21

Sorry, but can anyone explain this to me please?

Which one?

Original post by Ali_Ludley

Sorry that's what I meant

Reply 690

Bridget Jones

Original post by Whostolemycookie

Which one?

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The circled one, sorry :tongue:

Reply 691

Bow Tie

Original post by Whostolemycookie

Which one?

Sorry that's what I meant

I'm sure it is it's just these examiners are so pedantic in marking...

Thank you!!!!!!

Original post by nivvy21

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The circled one, sorry :tongue:

It looks like you got it right, what doesn't you understand

Reply 694

madrevision

Original post by tasniaa

good idea xD

is there a markscheme?

Reply 695

Kathiye

Is there anyone else who's feeling like they're going to completely mess this up? xD Chemical ideas is okay, but the storylines stuff is a different matter. And the advanced notice...

Reply 696

cheetahs56

That's just mark scheme, where's QP??

Reply 697

krisshP

Original post by michmic

Can anyone upload Jan 13 paper please??

http://www.thestudentroom.co.uk/showthread.php?p=42787726#post42787726

Reply 698

krisshP

Original post by cheetahs56

What page is Jan 2013 on guys? Sorry for asking :colondollar:

http://www.thestudentroom.co.uk/showthread.php?p=42787726#post42787726

Reply 699

Kathiye

Original post by Ali_Ludley

The propene is right however I'm not sure if you have to specify the double bond here so the proper name might be prop-2-ene and the diagram is correct.
If you look at the diagram it shows 2 but-2-enes and 1 prop-2-ene (in the middle).