chemistry edexcel synoptic

does anyone have any unit 6b papers for edexcel chemistry i really need them cause i dont have any and even my school isnt willing to give any jan papers will be really useful thanks in advance :tsr:

Reply 1

meawinner1

Theres jan 04 here http://www.emailed.org.uk/

Reply 2

Asian cutie

1

so wat does everyone think will come up. also u may way check out edexcel site instead of having an additional booklet u write in the exam paper now.

Reply 3

colombiche

2

well, usually they ask stuff that wos not in unit 4, nd 5, so im guessing it gonna be on sumtin like
1) structure of benzene, nd sum mechanisms,
2)group 4,
3) vanadium
4)transition metals,
5) pH curves
6) organic synthesis reactions

Reply 4

TerrorSquad

1

why do u think group 4?

Reply 5

kpg

11

colombiche

well, usually they ask stuff that wos not in unit 4, nd 5,

and unit 1...unit 2...couple of practical techniques...

You can kind of pre-guess a lot of the unit test questions but looking at past papers this is almost impossible with the synoptic because the questions are so varied and asked in different ways. Bit of intense revision over the weekend coming up I guess :frown:

Reply 6

john !!

14

I think they can ask you anything on the whole course. fortunately I did retakes so I have unit 1 and 2 fresh in my mind.. having said that its mostly obvious stuff now that Ive revised loads for unit 4 and 5. Juist need to go over all the tests for everything, and Im expecting them you sneak a few questions in on the applied organic chemistry (eg. weird stuff like "why do oils have lower mpts than fats?")

Reply 7

mr_shoe_uk

TerrorSquad

why do u think group 4?

Yeah, they asked about the trend of +2 becoming more stable than +4 down group 4, so I don't know if group 4 would come up again.

Having said that.. both units 4 and 5 had about oxidising alcohols and aldehydes, so maybe they will ask again anyway.

I expect some sort of redox, as this wasn't in unit 5 either, and probably something to do with the colour of transition metals.

Reply 8

Magician

15

mr_shoe_uk

I expect some sort of redox, as this wasn't in unit 5 either, and probably something to do with the colour of transition metals.

there was redox and colour of transition metals...!

Reply 9

Asian cutie

1

hopefull something about sicl4 and ccl4 because there a question on that every year and it has come up so far. u know the non option question is that usually on 1 topic or several????

Reply 10

mr_shoe_uk

Mathemagician

there was redox and colour of transition metals...!

I meant a redox titration calculation. Are you sure there was anything about the colour of transition metals..? There was the slight bit about iron, but nothing about why they're coloured.

Reply 11

littleone

does anyone have any revision tips? i cant seem to beable to do any questions on the paper or even think about how to approach it...in serrious need of some help!! :frown:

Reply 12

KP Nuts

1

Be able to do calculations - the first 10 or so marks are almost always a calculation - mainly the AS calculations such as volumetric, percentage purity or maybe some redox titrations. There is quite often a practical technique question too - and there was no heat under reflux, recrystallisation or (fractional) distillation in unit 4 or 5. They always try and choose stuff which 'permeates' chemistry - most of chemistry relates properties of elements / compounds to their structure - so you should probably look at bonding, electronegativity, shapes of molecules and intermolecular forces. Kinetics is quite a large block of chemistry - catalysis, maxwell boltzman and energy profiles. They can ask absolutely ANYTHING, but it is unlikely there will be many marks for simple recall from unit 1 and 2. It's going to be applying the main concepts to new and unfamiliar stuff - so if u get a question which u think sounds really strange or hard, just sit and think about the simple ideas u have learnt during your course - e.g. for Biology synoptic there was a question on how some bacteria were suited to responding to a protein - in the end it was nothing to do with the specific structure of the bacteria or the protein, just all about transport across membranes - a very simple concept you learn at AS.

Reply 13

Bond007

yeh kinda worried as well....as confused wat to revise as anything cud come up but the list KP just gave I might use as a checklist......I was just revising Phenol i.e It having intermolecualr hydrogen bonding leading to high pmt and bpt and it reaction as with Na/Alkalis....but now I kinda doubt at last Q of U5 had that Question....lol well might start some volmetric reaction.....does anyone think Benzene could prop up also I havent been taught SN1 and SN2 reactions! lol and they came up in the exam! Well I did have a go as I looked em up....but still as just saw a Q in a past paper and was very confused :eek:

So any tips? Cheerz

Reply 14

KP Nuts

1

SN1 and SN2 does not seem to be taught well anywhere - i had to look it up too. There was already a hell of a lot of benzene stuff in unit 5 - so i doubt that much will come up again. There was also nothing on commercial applications of organic compounds, and there is a large bit on commercial processes in unit 2 - another possibility!

Reply 15

littleone

KP Nuts

SN1 and SN2 does not seem to be taught well anywhere - i had to look it up too. There was already a hell of a lot of benzene stuff in unit 5 - so i doubt that much will come up again. There was also nothing on commercial applications of organic compounds, and there is a large bit on commercial processes in unit 2 - another possibility!

than u for ur advice! some calculations seem hard to work out where to start (see my thread)!
:smile:

Reply 16

Bond007

Hey yeh I agree ....yeh thats true...and also the usage of hetero and homo catalysts............in those commerical processes..so at least I know wat I shud be revising.Any other tips?

Reply 17

mr_shoe_uk

If benzene comes up they might ask you about the structure, ie. delocalised pi-bonding electrons.

You probably do know about SN1 and SN2 but not the names (well, I was like that anyway). SN1 is Substitution, nucleophilic, uni-mollecular; SN2 is substitution, nucleophilic, bi-mollecular.

Take Haloalkanes (Halogenoalkanes) as an example, the mechanism for them forming an alcohol is either of these. In a primary haloalkane, SN2 will probably be favoured, as there is 'simultaneous' breaking and forming of bonds. In a tertiary haloalkane SN1 will likely be favoured, as in the first step only the haloalkane itself is involved, the more electronegative halogen more likely to leave a carbocation, as due to the 3 electron-releasing alkyl groups, the carbocation is more stable.

If you want I can draw a mechanism on SN1 and SN2 and put them up here for you. It might be unlikely they're on the synoptic, as unit 5 already had a carbocation stability question and SN2 mechanism. You never know though, seeing there was quite a lot of repition of organic on units 4 and 5.

Reply 18

Bond007

That wud be Brill.....as then I could check if I was kinda right in U5....

waiting.................

Reply 19

KP Nuts

1

its in the NAS textbook if u have it

chemistry edexcel synoptic

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