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

1. Can anyone help me with this? Thanks and much appreciated, in advance!
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2. (Original post by nivvy21)
Can anyone help me with this? Thanks and much appreciated, in advance!
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
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
You divided by 100,000 instead of 10,000

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4. (Original post by nivvy21)
Can anyone help me with this? Thanks and much appreciated, in advance!
The difference is 80ppm (380 - 300).

5. Gah, a few hours until the exam >.<
6. what other colour changes do we need to know, apart from the bromine water?
7. (Original post by super121)
You divided by 100,000 instead of 10,000

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That was it! I was wondering why I was getting it wrong
8. (Original post by tasniaa)
what other colour changes do we need to know, apart from the bromine water?
When oxidation happens, the aldehyde converts to carboxylic acid and the colour change is orange to green
When oxidation happens, the aldehyde converts to carboxylic acid and the colour change is orange to green
thank you
10. 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
11. (Original post by King Hotpie)
Oh good now I just have to remember it for the next few hours

Does anyone know where I could find the January 2013 mark scheme?
Jan MS.pdf
When oxidation happens, the aldehyde converts to carboxylic acid and the colour change is orange to green
can you oxidise a ketone?
13. (Original post by nivvy21)
Can anyone help me with this? Thanks and much appreciated, in advance!
it's (380 - 300) / 300 ( X100) like you wrote
or did you want an explanation as to why you do that ?
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?
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

(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).

Thank you! I get it, I have no idea why I didn't do that and only couple more hours left
16. (Original post by CoolRunner)
can you oxidise a ketone?
Yes, Secondary alcohols are heated to oxidise a ketone
Yes, Secondary alcohols are heated to oxidise a ketone
You can't oxidise ketone's further though
18. What page is Jan 2013 on guys? Sorry for asking
19. (Original post by abzy1234)
You can't oxidise ketone's further though
Nope, and you can't oxidize tertiary alcohols
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

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