well, ive just done the C4 exam and it really wasnt as bad as id feared it would, how did everyone else find it??1
It was just about what i was expect;
A couple of nice mechanisms.
A Kp or a Kc.
An acid Ka question.
A rates question.
The only thing that i thought was slightly dodgy about it was the wordy question 8 parts, which seemed to have too many marks allocated to them for what was being asked, But we can but wait and see for the marks now.
The order question was a bit dodgy, but I had enough time to go over and run all my answers through the rate equation (k=47.9?), so they all worked out.
The partial pressure one they tried to feck us over with, I've never seen a question with just the partial pressure of one gas and from that you had to work out the rest. But it wasn't too hard.
The only toughie was the nmr question, which at a total of 4 marks can't really mess up my mark if i flunked it.
The spectrum for X was 2 wasn't it?
What was the reagent to turn phenylpropan-1-ol to phenylpropene?
Mod Expression - Language
What did you get for the pH, 2.2? What about the acid concentration? And what value did you get for KP?
I got k to equal 49.7 i think it was wither that or 47.9.
And i got spectra 2 as the spectrum for X
The rates question was fine as was all the calculations.
Conc Sulphuric Acid i belive was the reagent, altho they didnt as for it i also put it needed to be in alcoholic solution.
No NAOH and KOH are pretty much the same. I said H2S04 for that question anyway.
It was an ok paper altho i dont think my mark will go up. I just did it to prepare for the synoptic. So hopefully there will be some mod 4 on the multiple choice.
I put potassium dicromate(VII), no reaction with C, but D would form an aldehyde and water, I didnt know what colours so just said that. I said E reacts with fehlings to give a brick red solution..is that right? What did everyone get for the [salt] in the pH question?