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Edexcel Chemistry A2 Unit 5 ~ Wednesday 19th June 2013 (Now Closed)

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Reply 2180

fempi

What did people put for the question about TiCl4 and TiO2?

Reply 2181

Qwob

Original post by Bord3r

Well I was thinking that the C=O bond splits heterolytically, and an electron pair goes from the bond to oxygen. I'm not 100% sure though.
See here

Yeah I agree. I'm confident it was A. I immediately wrote down A in the exam.

Look at page 128 in the official Edexcel A2 book. Clearly shows a double-headed arrow going from the double-bond to the oxygen.

Reply 2182

AS01

Original post by Bord3r

Well it gave you a ratio which was in relation to XYZ respectively so I think it did matter. You'd only lose one mark if you didn't though.

hopefully it doesn

Reply 2183

oli_G

Original post by Bord3r

In order of the questions on in the above pictures.

1) I put D but I'm sure the answers actually B
2) Ligand Exchange D
3) C as it is a tertiary alcohol so is not oxidised by dichromate
4) 3 which was B
5) D
6) A lower pH
7) D
8) D
9) B
10) A
11) B
12) C increase in Entropy
13) I put D but the answer is C
14) Titre of 1.8 moldm-3

For 11 the answer is A as it is a tertiary alcohol, whereas C is secondary. I agree with the rest of your answers

Reply 2184

Qwob

Predictions on grade boundaries everyone?

I hope it's the same as it has been for the last three June exams: 73 A*, 67 A. That would be beautiful. Can see it being higher though as most people here seem to have done well too.

Reply 2185

Bord3r

Original post by oli_G

For 11 the answer is A as it is a tertiary alcohol, whereas C is secondary. I agree with the rest of your answers

Yeah sorry I meant to edit it.

Reply 2186

clydeshen411

ahhhhh, did anyone do the international paper? Was your paper difficult?

Reply 2187

Qwob

Is this what everyone got for the NMR one? Seems quite straightforward...

Reply 2188

blossomx

Original post by Qwob

Is this what everyone got for the NMR one? Seems quite straightforward...

yeah that's what i got

Reply 2189

Bord3r

Original post by Qwob

Is this what everyone got for the NMR one? Seems quite straightforward...

Reply 2190

F1's Finest

Original post by Qwob

Is this what everyone got for the NMR one? Seems quite straightforward...

yep

Reply 2191

oli_G

i can't believe i got that question wrong when it's so easy (the nmr) - i rushed it and made silly mistakes D:

Reply 2192

senz72

Well I feel dumb now. Still don't get it. Shows how dumb I am. :frown:

Posted from TSR Mobile

Reply 2193

blossomx

can anyone remember the question where it asked for the formulae for what formed when sulfuric acid and another acid (think it was an organic acid?) was added to something (think it begun with a 'b' lol). if so what did you put?
wow so vague sorry

Reply 2194

Blob2491

Original post by LeaX

I think it was CH3CH2CH2NH3+HSO4-?

Reply 2195

Qwob

Original post by LeaX

I think it was an amine with 4 carbons in it.

I put 2 amine molecules, each with an 'NH3 +' at the end, and then an 'SO4 2-'. Fairly sure that's incorrect though. I just guessed that the sulfuric acid would donate 2 hydrogens, 1 per amine. :confused: