OCR AS - Chemistry Unit F322 - Chains, energy and resource - REVISION!

Did anyone put a curly arrow on K?
I was wrong to do that ... the electrons dont go to k do they ....
Will i lose a mark for taht?

please could someone clarify these;

1. general formula of alcohol, why cant it be CnH2n+2O

2. international cooperation?

3. for the hydrolysis question - how many marks was it?

4. the last question i got the alcohol wrong but i got up to identifying its fragment and molecular formular but i drew it wrong which lead me to name it wrong which lead me to identify X as propyl propanoate! how many marks do u reckon i lost?

would methanol fuel cell not be accepted?

Did anyone else notice that on the last the question the melecular ion for Y was at 47, but there are no alcahols that can be formed with 47m/z.

For the nucleophilic substitution reaction did you have to show both Cl and Br's mechanism or only one? And what if you have shown both?

I thought the paper started off quite confusing but then got better.

My answers roughly - don't get disheartened/pissed off if our answers don't match, there's no guarantee I'm even right.

Respiration formula was standard.
Why is it endothermic Bond breaking is endothermic, bond breaking is exothermic, one outweighs the other, can't remember which one i put, nor do i have the mental capacity to work it out now.
Enthalpy question -2793 or something in that region.
Activation energy minimum energy needed to begin breaking reactant bonds and kick start a reaction.
Why cant you measure formation directly Activation energy is too high.

Dynamic system question - collision theory, more particles in same volume, closer together on average, all that jazz.
Car Exhaust not a closed system
Compare alkanes and alcohols I just waffled on about one has van der waal forces, the other has hydrogen bonds, hydrogen are stronger than vandewaals. And something about boiling points.
Name the monomer But-1-ene?

Ozone mechanism NO + 03 ------> N02 + 02 (1) NO2 + 0 ---------> NO + O2 (2) Overall: O3 + O ------> 2O2


Use for methanol Feedstock (just wrote that, not sure if i'll get a mark for putting just that)
Tertiary Alcohol 2-methylpropan-2-ol
Secondary Butan-2-ol
Why one dissolves in water Polar OH- group forms hydrogen bonds.
Complete combustion of methanol CH3OH + 1.5O2 -------> CO2 + 2H20
Incomplete CH3OH + O2 ------> CO + 2H20

Cracking Process 5 i think i put?
Isomer product Process 1?
One of the answers F
The other one ahah D&E

Drawing it First drawing just took the double bond out, next two, drew the methyl group, but then had the bromine next to the methyl group on one picture, then at the other point for the other.

Shapes Tetrahedral and then trigonal i think?

Mechanism was nucleophilic substitution, heterolytic, bromoalkane hydrolyzed faster because it was longer, weaker bond enthalpy and more reactive.

Ester Ethyl Propanoate and all that analysis ****.

All the green chemistry i just waffled **** loads - CO is poisonous/carcinogenic (i think that's a lie) contributes to acid rain? HCL (acid rain, ground level ozone?) And more stuff - which is probably all lies also.

Atom economy I thought was better - less waste, more sustainable

International treaty I invoked gandi and martin luther king as i began preaching about saving the world by reducing polymers.

That is all i can actually remember - hope any of that helps.
It's my third time doing it (got 118/150 both times) Keep resitting, your chemistry ability will continually get better.

Wish all of you luckk.

For the nucleophilic substitution reaction did you have to show both Cl and Br's mechanism or only one? And what if you have shown both?

isnt it homolytic fission ??

Were the only equations that we had to write out, was it just the radical one and the incomplete/complete combusion? I keep on thinking that there was another one to do with NO (Nirtrogen Monoxide), and it's really bugging me?

isnt it homolytic fission ??

Were the only equations that we had to write out, was it just the radical one and the incomplete/complete combusion? I keep on thinking that there was another one to do with NO (Nirtrogen Monoxide), and it's really bugging me?

i think there was a question that asked you to explain how NO catalyses the depletion of the ozone layer with the aid of equations?
you had to do
O3 + NO --> O2 + NO2
NO2 + O --> O2 + NO
overall equation: O3 + O --> 2O2

Ahh thanks, so that and the incomplete/complete combustion were the only equations?

1. i wrote CnH2n+2O and i think we'll get the mark because it is still correct really

2. i put something like it is important because otherwise there would still be waste being produced blablahblaaa it was a muddled answer, not entirely sure what they were after :/

3. 10 marks for the hydrolysis question i think

4. i think you will have lost 1 for naming the alcohol wrong and maybe 1 or 2 for identifying X wrong but not too many as long as you got propanoic acid you will have got a couple marks for working out the empirical formula and identifying the peaks and stuff

umm... the first question was showing the combustion of glucose i think? something along those lines? can't think of any others though

Yeah there was one actually.

2NO + O2 ------> 2NO2 or something like that?

Dam, it was really stupid of me to put alcoholic drinks for the uses of methanol question! LOL Even though i sat there, fully aware that ethanol is the only really used alcohol for drinks ... i decided to stick with it ....
I feel so stupid, especially as perfume was quite an obvious one ....