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March 29, 2024, 07:06:23 am

Author Topic: SUGGESTED ANSWERS!!!  (Read 40983 times)

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WhoTookMyUsername

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Re: SUGGESTED ANSWERS!!!
« Reply #120 on: June 20, 2012, 07:50:11 pm »
1

missunknown

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Re: SUGGESTED ANSWERS!!!
« Reply #121 on: June 20, 2012, 08:10:31 pm »
A+ would probably be 85% onwards. The cut-off tends to increase every year, but it also depends on the difficulty of the exam :)

SenriAkane

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Re: SUGGESTED ANSWERS!!!
« Reply #122 on: June 20, 2012, 08:31:11 pm »
Quick question

I've made the dumbest mistake and read that graph wrong and i got 38mg instead of 36 but i showed all my working out so the examiner will realise it was because i read it wrong...
what do you reckon will happen? Will i drop 1 mark or 1/2 mark??? or 2 marks?

Thanks :)
you might not lose any because 36-38 is fairly close
but otherwise 1 mark at most
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ilikeoranges

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Re: SUGGESTED ANSWERS!!!
« Reply #123 on: July 02, 2012, 02:54:08 pm »
for question 4d, could fractional distillation be an appropriate method to use????

charmanderp

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Re: SUGGESTED ANSWERS!!!
« Reply #124 on: July 02, 2012, 03:18:12 pm »
for question 4d, could fractional distillation be an appropriate method to use????
Unfortunately not.
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ilikeoranges

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Re: SUGGESTED ANSWERS!!!
« Reply #125 on: July 02, 2012, 05:35:38 pm »
but couldn't you explain that if another substance separated at a different boiling point to the propanoate from the mixture then this indicates that substance is not pure??

charmanderp

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Re: SUGGESTED ANSWERS!!!
« Reply #126 on: July 02, 2012, 05:38:34 pm »
but couldn't you explain that if another substance separated at a different boiling point to the propanoate from the mixture then this indicates that substance is not pure??
You can't actually tell whether the substances are being separated or not though.
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ilikeoranges

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Re: SUGGESTED ANSWERS!!!
« Reply #127 on: July 02, 2012, 05:42:30 pm »
would i get any marks though ??

charmanderp

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Re: SUGGESTED ANSWERS!!!
« Reply #128 on: July 02, 2012, 05:43:39 pm »
If it was a three mark question I'd give you one mark but since it was only worth two, you probably won't get any, unfortunately.
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thushan

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Re: SUGGESTED ANSWERS!!!
« Reply #129 on: July 02, 2012, 10:32:07 pm »
The other thing is that fractional distillation will just separate the components of the reaction mixture. You wouldn't know which of the components is the ester.
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ilikeoranges

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Re: SUGGESTED ANSWERS!!!
« Reply #130 on: July 03, 2012, 07:30:53 pm »
ah well too bad for me, I don't know why it didn't come to my mind to put gas chromatography instead of frac distillation  :P