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

Reply 1120

super121

5

Original post by Tejmasta

What were the large scale uses of chlorine?

i wrote PVC and water treatment

Reply 1121

Welbeck

3

would saying propellants for the CFC questions be alright guys?

Reply 1122

tigerz

Original post by nukethemaly

I wrote disinfectant and for purifying drinking water? or something like that

Exactly what I wrote :P

Original post by nukethemaly

Chlorofluorocarbons. and I wrote blowing agents for that one, it was quite literally the only thing on my mind because my friend and I made this inappropriate joke in the morning around it haha

Haha ditto :wink:

Reply 1123

gregzzzter

Original post by nukethemaly

Chlorofluorocarbons. and I wrote blowing agents for that one, it was quite literally the only thing on my mind because my friend and I made this inappropriate joke in the morning around it haha

hahahaha, damn that would of been a good way of remembering it. Nice I put chlorofluorocarbons, thought it was a hard paper though. Hopefully 75/80 for an A

Reply 1124

Bow Tie

14

Original post by nukethemaly

I wrote disinfectant and for purifying drinking water? or something like that

Original post by tigerz

Exactly what I wrote :P

Haha ditto :wink:

I thought of the word 'purify' but its not actually purifying the liquid, in fact it is making it more impure by adding chlorine. It kills bacteria but that isn't the same as purifying. I'm not sure what the MS will be like on this though.

(edited 10 years ago)

Reply 1125

booooomblastruin

Original post by gregzzzter

I put flame retardants for the other use of CFCs is that right? and what does CFC actually stand for?

I think flame retardants is exclusive to bromine

Reply 1126

JammyGit07

16

I wrote Anhydrous Potassium Sulphate....Is that acceptable? Knew i should of put Sodium -_-'

(edited 10 years ago)

Reply 1127

tommyhulk

has anyone made an unofficial markscheme???

Reply 1128

gregzzzter

Is there any chance of an unofficial mark scheme being posted? There was one for Core 2 maths that I did two week ago, don't know if it's the same for Chemistry. :rolleyes:

Reply 1129

super121

5

Original post by booooomblastruin

I think flame retardants is exclusive to bromine

Chlorofluorocarbon

Reply 1130

super121

5

Original post by gregzzzter

Is there any chance of an unofficial mark scheme being posted? There was one for Core 2 maths that I did two week ago, don't know if it's the same for Chemistry. :rolleyes:

OCR papers are really hard to get hold of for some reason :/

Reply 1131

YouKnowMyName

1

do you have to say anhydrous to get the mark

I just said Magnesium Sulfate which i know is a drying agent =/

Reply 1132

MintCrepz

5

Original post by JammyGit07

I wrote Anhydrous Potassium Sulphate....Is that acceptable? Knew is should of put Sodium -_-'

Exactly the same :smile:

perfect

Reply 1133

tigerz

Original post by Ali_Ludley

I thought of the word 'purify' but its not actually purifying the liquid, in fact it is making it more impure by adding chlorine. It kills bacteria but that isn't the same as purifying. I'm not sure what the MS will be like on this though.

True that, I totally forgot about PVC etc I think i'll get 1 mark for that bit

Reply 1134

Alexandra82

Did anyone get 1,1,5- trimethyl hept-4-ene for the name of the molecule by any chance. It seems right to me when i work it out, but everyone seems to be writing other things...

Reply 1135

Bow Tie

14

Original post by tigerz

True that, I totally forgot about PVC etc I think i'll get 1 mark for that bit

To be honest, you may get the mark for purify, it just depends upon how pedantic they will be in the paper on marking.

Reply 1136

booooomblastruin

Original post by gregzzzter

I put flame retardants for the other use of CFCs is that right? and what does CFC actually stand for?

Original post by super121

Chlorofluorocarbon

Oh snap, apparently CFCs did use to be used as flame retardants. The MS should acknowledge this :biggrin:

Reply 1137

nukethemaly

11

Original post by gregzzzter

hahahaha, damn that would of been a good way of remembering it. Nice I put chlorofluorocarbons, thought it was a hard paper though. Hopefully 75/80 for an A

I'm hoping for maybe 70-72 for an A

Yeah I didn't think it was too easy or too hard, it was standard I'd say

Reply 1138

Bow Tie

14

Original post by Alexandra82

Did anyone get 1,1,5- trimethyl hept-4-ene for the name of the molecule by any chance. It seems right to me when i work it out, but everyone seems to be writing other things...

It is in fact 3,7-dimethyloct-3-ene.

Its this because the double bond must be on the smallest numbered carbon possible (In this case number 3 carbon) and then take the longest chain (8 carbons = octene) and then put the other groups in which is 2 methyl groups left on the 3rd and 7th carbon.

And there we have it.