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OCR Chemistry F322~ 4th June 2013~ AS Chemistry

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Reply 2400

beautywithbrains

From seeing those old spec questions, had made me panic loads now :frown:

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Reply 2401

Akpanudo

Original post by Sara_A

Does anyone know where the specimen paper mark scheme is?

Yup http://www.ocr.org.uk/Images/75089-unit-f322-chains-energy-and-resources-specimen.pdf

Reply 2402

Sara_A

Original post by Akpanudo

Yup http://www.ocr.org.uk/Images/75089-unit-f322-chains-energy-and-resources-specimen.pdf

Thanks, didnt know you had to scroll down for the mark scheme silly me

Reply 2403

amin666

Original post by tom2013

Hi guys, I am going to retake this paper for the 3rd time :frown:

I got C first time around and then got a U in January! So any advise on how to revise for this unit??

oh, I thought Jan 2013 was much easier that June 2012
I got e in June 12 and c in Jan 13
this time I'm aiming to a freaking A :biggrin:

Reply 2404

MAZADO

can someone help on question 3 b) ii) the cycle

http://www.ocr.org.uk/Images/78566-question-paper-unit-f322-chains-energy-and-resources.pdf

Reply 2405

Ché.

Original post by shomshomni

Thank you!!!!!

Ni for Dehydration too...
Palladium, Rhodium and Platinum for Isomerisation...
Inert Aluminium Oxide for Isomerisation and Reforming...
:biggrin:

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Reply 2406

simifeltham

Original post by MAZADO

can someone help on question 3 b) ii) the cycle

http://www.ocr.org.uk/Images/78566-question-paper-unit-f322-chains-energy-and-resources.pdf

-393-285-168--54=-792

Reply 2407

amin666

Original post by MAZADO

can someone help on question 3 b) ii) the cycle

http://www.ocr.org.uk/Images/78566-question-paper-unit-f322-chains-energy-and-resources.pdf

Hi, Sure,
You need to cancel out the same elements in each two equations, to get the equations in the box
for example for the first one:
C(s) (up) cancelles with C(s) (down)
and
11/2 O2 (up) cancels with the 11/2 O2 (down)
so what is left is same as 4th equation, u see? :biggrin:

then put the value

Reply 2408

wndms

Original post by iamvick

That's not actually in the specimen. What you need to know is the rate of hydrolysis increases as you move down group 7. This is because the bond enthalpy of the C-Halogen bond weakens and so is easier to break; hence a faster reaction.

You need to know primary secondary tertiary halogenoalkanes. It was in the past paper

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Reply 2409

MAZADO

Original post by amin666

then put the value

got it thanks very much!

Reply 2410

wndms

Can someone explain greenhouse effect pleade

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Reply 2411

amin666

Just a warning to people who thinking to take A2 Chemistry next year ( ITS A PAIN ).

Reply 2412

Sum786

can someone please explain the key points from chapter 4?

Thanks in advance

Reply 2413

theo3335796

Original post by amin666

Just a warning to people who thinking to take A2 Chemistry next year ( ITS A PAIN ).

How is A2 if you find AS not too bad

Reply 2414

XiLE

For anyone who has done the January 2013 paper, the last question was worth 10 marks and gave mass of C, H & O. However I ignored them & used the m/z to find the mr and used trial and error to get the molecular formula.
After deducing X I found Y however to achieve full 10 marks do I have to use all information in the question? I find it unfair answering the question exactly but to get all the marks I have to use information I don't need like fragment ions. :/

Reply 2415

GeneralOJB

****storm in this thread. Have some sleep and do some last minute revision tomorrow morning.

Reply 2416

amin666

Original post by Sum786

can someone please explain the key points from chapter 4?

Thanks in advance

use of catalyst in car.
ways to store CO2 ( under sea bed, react with base to make carbonates)
global warming, and how its produced ( by absorbing of IR radiation by CO2 and H2O, bonds vibrating and emit the energy back to earth)

these are the most important parts that always will be questions from in exam paper.

(edited 10 years ago)

Reply 2417

saz62

GUYS IM CRAMMING NOW BECAUSE I DIDN'T GET TIME TO REVISE OVER THE PAST FEW WEEKS BECAUSE I WAS REALLY WORRIED ABOUT BIOLOGY 1 AND CHEM 1 RESITS ://///

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Reply 2418

LH78

predictions on what will come up? :confused:

Reply 2419

amin666

Original post by theo3335796

How is A2 if you find AS not too bad

I'm doing A2 chem only because i didn't have any other choice, its a pain specially F325
you need to know F321, F322 and F324 to answere the questions,
and its horrible