f322 january 2012

question paper

HideShow resource information
  • Created by: Danni
  • Created on: 16-05-12 13:39
Preview of f322 january 2012

First 323 words of the document:

Thursday 19 January 2012 ­ Afternoon
AS GCE CHEMISTRY A
F322 Chains, Energy and Resources
* F 3 1 4 4 4 0 1 1 2 *
Candidates answer on the Question Paper.
OCR supplied materials: Duration: 1 hour 45 minutes
· Data Sheet for Chemistry A (inserted)
Other materials required:
· Scientific calculator
* F 3 2 2 *
INSTRUCTIONS TO CANDIDATES
· The Insert will be found in the centre of this document.
· Write your name, centre number and candidate number in the boxes above. Please write clearly
and in capital letters.
· Use black ink. HB pencil may be used for graphs and diagrams only.
· Answer all the questions.
· Read each question carefully. Make sure you know what you have to do before starting your
answer.
· Write your answer to each question in the space provided. If additional space is required, you
should use the lined pages at the end of this booklet. The question number(s) must be clearly
shown.
· Do not write in the bar codes.
INFORMATION FOR CANDIDATES
· The number of marks is given in brackets [ ] at the end of each question or part question.
Where you see this icon you will be awarded marks for the quality of written communication
in your answer.
This means for example you should:
· ensure that text is legible and that spelling, punctuation and grammar are accurate so that
meaning is clear;
· organise information clearly and coherently, using specialist vocabulary when appropriate.
· You may use a scientific calculator.
· A copy of the Data Sheet for Chemistry A is provided as an insert with this question paper.
· You are advised to show all the steps in any calculations.
· The total number of marks for this paper is 100.
· This document consists of 24 pages. Any blank pages are indicated.
© OCR 2012 [H/500/7834] OCR is an exempt Charity
DC (LEO/SW) 40572/6 Turn over

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Answer all the questions.
1 Crude oil is a source of many hydrocarbons.
The skeletal formulae of some of these hydrocarbons are shown below.
A B C
D E F
G H I
(a) Explain why compound A is both saturated and a hydrocarbon.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [2]
(b) What is the empirical formula for compound A?
.............................................................................................................................................. [1]
(c) Give the letters, A, B, C, D, E, F, G, H or I, of two hydrocarbons that are structural isomers of
each other.
........................…read more

Page 3

Preview of page 3

Here's a taster:

The petroleum industry processes straight chain alkanes into cyclic hydrocarbons such as A,
B and E.
(i) Explain why the petroleum industry processes straight chain alkanes into cyclic
hydrocarbons.
...........................................................................................................................................
...................................................................................................................................... [1]
(ii) Hydrocarbon C can be processed into the cyclic hydrocarbon B.
Construct an equation for this reaction.
[1]
(e) Explain why hydrocarbon D has a higher boiling point than hydrocarbon C.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [2]
(f) Hydrocarbons G and H are stereoisomers of each other.…read more

Page 4

Preview of page 4

Here's a taster:

A hydrocarbon molecule, C16H34, is cracked to form an octane molecule and two molecules
of but-2-ene.
Construct the equation for this reaction.
.............................................................................................................................................. [1]
(i) Compound I is 3-methylheptane. It does not contain a functional group.
I
(i) What is meant by the term functional group?
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [1]
(ii) Compound I reacts with chlorine in the presence of ultraviolet radiation to give several
structural isomers of C8H17Cl.
How many structural isomers could be formed in this reaction?
......................................................................................................................................…read more

Page 5

Preview of page 5

Here's a taster:

Ethanoic acid, CH3COOH, is used to make esters.
Some information about two of the processes used to make ethanoic acid is given below.
Process 1
This is a one-step process that involves the reaction of methanol with carbon monoxide.
CH3OH + CO CH3COOH
The conditions used are 180 °C and 30 atmospheres pressure. A rhodium/iodine catalyst
is used.
The percentage yield for this process is 99%.
Process 2
This involves the oxidation of naphtha, a fraction obtained from crude oil.…read more

Page 6

Preview of page 6

Here's a taster:

The other products formed in Process 2 are carboxylic acids, aldehydes and ketones.
A research chemist investigates some of these other products of Process 2.
(i) The research chemist isolates product, J.
The infrared spectrum of J is shown below.
100
transmittance
(%)
50
0
4000 3000 2000 1500 1000 500
wavenumber / cm­1
The chemist also finds that 0.172 g of a pure sample of J contains 2.00 × 10­3 mol of J.
Suggest, with reasons, one possible structure for J.…read more

Page 7

Preview of page 7

Here's a taster:

The chemist isolates another product, the carboxylic acid, K.
K has the molecular formula C4H8O2.
Suggest a possible structure and name for K.
structure
name ............................................................................................................................ [2]
(c) Ethanoic acid is used in the manufacture of the ester, propyl ethanoate.
Describe how ethanoic acid is converted into propyl ethanoate.
Include an equation in your answer.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
..............................................................................................................................................…read more

Page 8

Preview of page 8

Here's a taster:

Enthalpy changes can be determined directly or indirectly.
(a) A student investigates the reaction between magnesium and dilute hydrochloric acid.
Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g)
The student determines the enthalpy change for this reaction.
In her experiment, she reacts 0.486 g of magnesium with 50.0 cm3 of 2.00 mol dm­3 HCl(aq).
The HCl(aq) is in excess.
The temperature of the solution changes from 19.2 °C to 32.0 °C.
(i) Calculate the energy released, in kJ, during this reaction.…read more

Page 9

Preview of page 9

Here's a taster:

The student wants to determine the enthalpy change of formation of calcium carbonate,
CaCO3(s).
Ca(s) + C(s) + 1½O2(g) CaCO3(s)
(i) What is meant by the term standard enthalpy change of formation?
You should state the standard conditions in your answer.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [3]
(ii) Using the following data and enthalpy cycle,
· fill in the boxes on the enthalpy cycle with the correct enthalpy change values
· calculate the enthalpy change of formation, Hf, of CaCO3(s).…read more

Page 10

Preview of page 10

Here's a taster:

Hydrogen and chlorine are reacted together to form hydrogen chloride.
H2(g) + Cl2(g) 2HCl(g) H = ­184 kJ mol­1
(a) Calculate the bond enthalpy for the H­Cl bond using the information in the table below.
bond enthalpy
bond
/ kJ mol­1
H­H +436
Cl­Cl +243
bond enthalpy = ........................................... kJ mol­1 [2]
(b) The reaction is repeated at a higher pressure.
Describe and explain what happens to the rate of the reaction between H2(g) and Cl2(g).
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
..............................................................................................................................................…read more

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »