F322 Pack

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THIS IS A NEW SPECIFICATION
ADVANCED SUBSIDIARY GCE
CHEMISTRY A F322
Chains, Energy and Resources
Wednesday 3 June 2009
*OCE/T73768*
Candidates answer on the question paper
OCR Supplied Materials:
Morning
· Data Sheet for Chemistry A (Inserted)
Duration: 1 hour 45 minutes
Other Materials Required:
· Scientific calculator
* F 3 2 2 *
INSTRUCTIONS TO CANDIDATES
· Write your name clearly in capital letters, your Centre Number and Candidate Number in the boxes above.
· Use black ink. Pencil may be used for graphs and diagrams only.
· Read each question carefully and make sure that you know what you have to do before starting your answer.
· Answer all the questions.
· Do not write in the bar codes.
· Write your answer to each question in the space provided, however
additional paper may be used if necessary. FOR EXAMINER'S USE
Qu. Max. Mark
INFORMATION FOR CANDIDATES
· The number of marks is given in brackets [ ] at the end of each question or 1 13
part question.
· Where you see this icon you will be awarded marks for the 2 14
quality of written communication in your answer.
3 15
This means for example you should:
· ensure that text is legible and that spelling, punctuation and grammar 4 14
are accurate so that meaning is clear;
· organise information clearly and coherently, using specialist
5 13
vocabulary when appropriate.
· You may use a scientific calculator.
6 12
· A copy of the Data Sheet for Chemistry A is provided as an insert with this
question paper.
7 19
· 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 16 pages. Any blank pages are indicated. TOTAL 100
SP © OCR 2009 [H/500/7834] OCR is an exempt Charity
SP (SHW 00297 6/08) T73768/6 Turn over

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Page 2

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Answer all the questions.
1 Crude oil is a source of hydrocarbons which can be used as fuels or for processing into
petrochemicals.
Octane, C8H18, is one of the alkanes present in petrol.
Carbon dioxide is formed during the complete combustion of octane.
C8H18 + 12½O2 8CO2 + 9H2O
(a) What is the general formula for an alkane?
............................................................................................................................................ [1]
(b) Carbon monoxide, CO, is formed during the incomplete combustion of octane.…read more

Page 3

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Oil companies process hydrocarbons, such as octane, into branched and cyclic hydrocarbons
that promote efficient combustion in petrol.
Draw the skeletal formulae of a branched hydrocarbon and a cyclic hydrocarbon, each
containing eight carbon atoms.
[2]
(e) Some scientists believe that increased CO2 levels arising from the combustion of hydrocarbons
lead to global warming because CO2 is a greenhouse gas. Carbon capture and storage, CCS,
is being developed as a method for removing CO2 produced by combustion.…read more

Page 4

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Enthalpy changes of combustion, Hc, are amongst the easiest enthalpy changes to determine
directly.
(a) Define the term enthalpy change of combustion.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................ [2]
(b) A student carried out an experiment to determine the enthalpy change of combustion of
pentan-1-ol, CH3(CH2)4OH.
In the experiment, 1.76 g of pentan-1-ol was burnt. The energy was used to heat 250 cm3 of
water from 24.0 °C to 78.0 °C.
(i) Calculate the energy released, in kJ, during combustion of 1.76 g pentan-1-ol.…read more

Page 5

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The standard enthalpy change of formation of hexane can be defined as:
The enthalpy change when 1 mol of hexane is formed from its constituent elements in
their standard states under standard conditions.
Hexane melts at ­95 °C and boils at 69 °C.
(i) What are standard conditions?
.................................................................................................................................... [1]
(ii) An incomplete equation is shown below for the chemical change that takes place to
produce the standard enthalpy change of formation of hexane.…read more

Page 6

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Alkenes are unsaturated hydrocarbons used in the industrial production of many organic
compounds.
(a) Complete the flowchart below to show the organic product formed in each addition reaction of
methylpropene.
H CH3
H2 / Ni Br2
C C
H CH3
HBr
mixture of isomers
[4]
(b) Curly arrows are used in reaction mechanisms to show the movement of electron pairs during
chemical reactions.
Use curly arrows to outline the mechanism for the addition reaction of methylpropene with
bromine.…read more

Page 7

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Alkenes can be prepared by the dehydration of alcohols with an acid catalyst.
Cyclohexene can be prepared by the dehydration of cyclohexanol, shown below.
OH
+ H2O
A student reacted 7.65 g of cyclohexanol, C6H12O, and obtained 0.0268 mol of cyclohexene.
(i) What is the molecular formula of cyclohexene?
.................................................................................................................................... [1]
(ii) Calculate the percentage yield of cyclohexene.
answer = .................................................... % [3]
(d) Percentage yield has been used for many years to measure the `success' of a reaction.…read more

Page 8

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In the chemical industry methanol, CH3OH, is synthesised by reacting together carbon monoxide
and hydrogen in the presence of copper, zinc oxide and alumina which act as a catalyst. This is a
reversible reaction.
CO(g) + 2H2(g) CH3OH(g) H = ­91 kJ mol­1
(a) High pressures and low temperatures would give the maximum equilibrium yield of methanol.
Explain why.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................ [2]
(b) Explain why the actual conditions used in the chemical industry might be different from those
in (a) above.
...................................................................................................................................................…read more

Page 9

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Using the axes below, sketch an enthalpy profile diagram for an exothermic reaction to
show how a catalyst provides an alternative reaction route with a lower activation energy.
Include on your diagram labels for:
· enthalpy change, H;
· activation energy for the catalysed route, Ec;
· activation energy for the uncatalysed route, Ea.
reactants
enthalpy
progress of reaction
[3]
(d) Chemical companies are using catalysts to develop processes that are more sustainable.
These processes reduce costs and are less harmful to the environment.…read more

Page 10

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Alcohols A, B, C and D are shown below.
CH3 CH3
CH3 CH2 OH H C OH CH3 CH2 CH2 OH H3C C OH
CH3 CH3
A B C D
(a) Compound A is ethanol, a very useful alcohol.
Identify the two main methods used in the industrial production of ethanol.
Write an equation for each method.
method 1 ...................................................................................................................................
...................................................................................................................................................
equation ....................................................................................................................................
method 2 ...................................................................................................................................
...................................................................................................................................................
equation ............................................................................................................................. [4]
(b) A student heated each alcohol, A­D, with acidified potassium dichromate(VI) as the oxidising
agent.…read more

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