OCR Chemistry F322~ 4th June 2013~ AS Chemistry

I wrote ir spectropocy is used for measuring greenhouse gasses? Is that correct?

Here is an unofficial mark scheme for Q3

3(a) Alkene and ester (2)

(b) C=C bond present (1)

(c) Orange/brown to colourless (1)

(d)(i) Stereoismers have the same structural formula but different arrangement of atoms in space (1)
(ii) I is Z-isomer, J is E-isomer (1)

(e)(i) Enthalpy change when one mole of a substance undergoes complete combustion (2)
(ii) 4.18 x (54.0 - 20.2) x 50 = 7.06 kJ/mol (2)
(iii) 1.34/268 = 0.005mol (2)
(iv) 7.064/0.005 = -1419 kJ/mol (3)

‒4596 or ‒4956 something like that

What if you wanted just an A overall and got a B in AS? Would you just need high A's, like 85%?

That's not right. An A* grade is awarded ONLY for the A2 units. You must:

1) Get enough UMS for an A overall (480/600)

2) Get an average of 90% or above in the A2 units. (270/300 or above for A2)

However, I'm not entirely sure if the Practical Skills (F326) unit counts towards this. In mathematics you only need a 90% average in C3 and C4 (not the third, chosen module) to get the A*, so maybe it's only for the core exams. Anyone know for certain?

I put environmental monitoring of pollution... Not sure about it though.

As always, there will be some people who found the paper easy and others who found it extremely hard. At my college, people didn't think it went very well. Lets not forget that grade boundaries are based on how well everyone who sat this paper did. Many had the same reaction to January's paper (I didn't do that one, I'm just basing that on what I read on here) and it was 79 for an A. So I don't think anyone is in the position to be predicting grade boundaries to be honest. Those who feel they have done exceedingly well will predict the grade boundaries to be high and those who didn't feel they did as well will be praying its lower.

Patience is a virtue. I know its hard but the only thing we can all do is get on with the rest of exams and wait till August for results.

This may be a dumb question...but...what do you do about the nitrogen? I mean, they didn't give you the values in the table?

For functional group i said double bond is this okay

This may be a dumb question...but...what do you do about the nitrogen? I mean, they didn't give you the values in the table?

i know omfg i didn't get that either

My teacher told me that the largest number of C atoms you can get in an alkane ring is 6, so wouldn't the skeletal formula of Octane be a hexagon with two methyl groups extending from it?

I remember it being discussed not so long ago.

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i know omfg i didn't get that either

I put environmental monitoring of pollution... Not sure about it though.