Cambridge International AS & A Level: CHEMISTRY 9701/22

Cambridge International AS & A Level
*2460000734*
CHEMISTRY9701/22
Paper 2 AS Level Structured Questions May/June 2020
1 hour 15 minutes
You must answer on the question paper.
You will need: Data booklet
INSTRUCTIONS
●● Answer all questions.
●● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
●● Write your name, centre number and candidate number in the boxes at the top of the page.
●● Write your answer to each question in the space provided.
●● Do not use an erasable pen or correction fluid.
●● Do not write on any bar codes.
●● You may use a calculator.
●● You should show all your working, use appropriate units and use an appropriate number of significant
figures.
INFORMATION
●● The total mark for this paper is 60.
●● The number of marks for each question or part question is shown in brackets [ ].
This document has 12 pages. Blank pages are indicated.
IB20 06_9701_22/3RP
© UCLES 2020 [Turn over
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2
Answer all the questions in the spaces provided.
1 Gallium is an element in Group 13.
A sample of gallium is analysed using a mass spectrometer. The mass spectrum produced is
shown.
60.11%
39.89%
% relative
abundance
mass 69 71
(a) Explain what is meant by the term relative atomic mass.
.....................................................................................................................................................
............................................................................................................................................... [2]
(b) C
alculate the relative atomic mass of gallium in this sample. Give your answer to 4 significant
figures.
Show your working.
relative atomic mass = .............................. [2]
(c) Complete the table which describes a gaseous atom of gallium.
total number type of orbital which

nucleon
isotope of electrons in contains the electron in
number
lowest energy level the highest energy level
71
Ga
[3]
© UCLES 2020 9701/22/M/J/20

3
(d) When gallium is heated in excess chlorine, gallium trichloride, GaCl 3, is made.
Draw the shape of the gallium trichloride molecule and suggest the Cl –Ga–Cl bond angle.
shape of molecule
bond angle .................................................................

[2]
(e) Gallium oxide, Ga2O3, and aluminium oxide react in the same way with HCl (aq) and with
NaOH(aq).
(i) Suggest the equation for the reaction between Ga2O3 and HCl (aq).
........................................................................................................................................ [1]
(ii) Suggest an equation for the reaction between gallium oxide and NaOH(aq).
........................................................................................................................................ [2]
[Total: 12]
© UCLES 2020 9701/22/M/J/20 [Turn over

4
2 Nitric acid can be made in a 3-stage process.
Stage 1 Ammonia is oxidised by oxygen from the air, to form nitrogen monoxide and water. This
reaction is carried out at 10–13 atmospheres pressure and 900 °C in the presence of a
platinum catalyst.
Stage 2 Nitrogen monoxide reacts with more oxygen to form nitrogen dioxide.
2NO + O2 2NO2 ∆H = –114 kJ mol–1
Stage 3 Nitrogen dioxide reacts with water to make nitric acid and nitrogen monoxide.
3NO2 + H2O → 2HNO3 + NO
(a) Write an equation to show the reaction occurring in stage 1.
............................................................................................................................................... [1]
(b) Draw a ‘dot-and-cross’ diagram to show the arrangement of outer electrons in a molecule of
ammonia.
[1]
(c) (i) In the boxes, give the oxidation numbers of nitrogen in the nitrogen-containing species for
the reaction in stage 3.
3NO2 + H2O → 2HNO3 + NO
[2]
(ii) Explain why the reaction in stage 3 is described as a disproportionation reaction.

Include reference to transfer of electrons in your answer.
..............................................................................................................................................
..............................................................................................................................................
........................................................................................................................................ [2]
© UCLES 2020 9701/22/M/J/20

5
(d) The release of nitrogen monoxide into the atmosphere causes atmospheric pollution.
State and explain the effect of nitrogen monoxide gas in contact with moist air.
.....................................................................................................................................................
............................................................................................................................................... [2]
(e) The nitric acid made in stage 3 can then be reacted with ammonia to form ammonium nitrate.
Stage 3 3NO2 + H2O → 2HNO3 + NO
NH3 + HNO3 → NH4NO3
Calculate the volume of nitrogen dioxide, measured at room temperature and pressure,
required to make 40 tonnes of ammonium nitrate.
[1 tonne = 1000 kg]
Show your working.
volume of nitrogen dioxide = .............................. [3]
(f) State one use of ammonium nitrate.
............................................................................................................................................... [1]
[Total: 12]

6
3 Sucrose, C12H22O11, reacts with water to form glucose and fructose in reaction A.
glucose fructose
O H O CH2OH
C C
H C OH HO C H
C12H22O11 + H2O HO C H + H C OH
H C OH H C OH
H C OH CH2OH
CH2OH
reaction A
(a) Suggest a name for this type of reaction.
............................................................................................................................................... [1]
(b) Explain in detail, why glucose and fructose are a pair of structural isomers. Your answer should
refer specifically to these two molecules.
.....................................................................................................................................................
.....................................................................................................................................................
............................................................................................................................................... [2]
(c) Reaction A occurs faster in the presence of an enzyme. This is reaction B.
(i) The activation energy for reaction B is +29 kJ mol–1.
Predict a value for the activation energy of reaction A.
........................................................................................................................................ [1]
(ii) The enthalpy change for reaction A is –14 kJ mol–1.
Predict a value for the enthalpy change for reaction B.
........................................................................................................................................ [1]
© UCLES 2020 9701/22/M/J/20

7
(iii) Sketch a labelled energy level diagram for reaction B. Use relevant values from (c)(i) and
(c)(ii).
energy
/ kJ mol–1
progress of reaction
[2]
(d) 1.00 g of sucrose, C12H22O11, is completely combusted. The heat energy produced is used to
increase the temperature of 250 g of water inside a calorimeter from 25.0 °C to 40.7 °C.
These data can be used to calculate the enthalpy change of combustion of sucrose.
(i) Explain what is meant by the term enthalpy change of combustion of sucrose.
..............................................................................................................................................
..............................................................................................................................................
........................................................................................................................................ [2]
(ii) Use the Data Booklet to calculate the enthalpy change, in kJ mol–1, for the combustion of
sucrose.
Assume that all of the heat energy produced is transferred to the water.
Show your working.
enthalpy change of combustion of sucrose = .............................. kJ mol–1

[3]
[Total: 12]

8
4 (a) An unlabelled bottle contains a straight-chain halogenoalkane, Q. The molecular formula of Q
is C5H11X, where X is a halogen; bromine, chlorine or iodine.
A test is carried out to identify the halogen present in Q.

A sample of Q is added to NaOH(aq) and warmed. Dilute nitric acid is then added followed by
a few drops of aqueous silver nitrate. A cream precipitate is observed.
(i) Suggest the identity of X.
........................................................................................................................................ [1]
(ii) Write an ionic equation to describe the formation of the cream precipitate. Include state
symbols.
........................................................................................................................................ [1]
(iii) Describe a further test which would confirm the identity of X.
test .......................................................................................................................................
expected result ....................................................................................................................

[2]
(b) The reaction of Q with NaOH(aq) tends to proceed via an SN2 mechanism.
(i)
Suggest the structural formula of the straight-chain halogenoalkane Q.
[1]
(ii)
Explain why the reaction tends to proceed via an SN2 mechanism rather than an SN1
mechanism.
..............................................................................................................................................
..............................................................................................................................................
........................................................................................................................................ [2]
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9
(c) Two different halogenoalkanes, P and R, both with the molecular formula C4H9Cl, are separately
dissolved in ethanol and heated under reflux with sodium hydroxide.
The major organic product of each of these reactions is methylpropene.
(i)
Name the type of reaction occurring.
........................................................................................................................................ [1]
(ii)
Write an equation, using molecular formulae, to represent the reaction occurring.
........................................................................................................................................ [1]
(iii) Draw the skeletal formula of methylpropene.
[1]
(iv) Give the names of P and R.
........................................................................................................................................ [2]
[Total: 12]

10
5 The reaction sequence shows how ethene, C2H4, can be converted into other organic molecules.
C 2H 4
reaction 1
reaction 5
OH Cl
reaction 2 reaction 6
O NH2
reaction 3
HO
reaction 4
heat with dilute acid
(a) Complete the table to give

●● the name of the reaction mechanisms of reactions 1 and 6
●● the reagents and conditions required for reactions 1, 2 and 6.
name of name of reagents

reaction
mechanism and conditions
[6]
© UCLES 2020 9701/22/M/J/20

11
(b) In reaction 3 the organic molecule reacts with HCN and a KCN catalyst.
(i) Complete the diagram to show the mechanism of the reaction occurring.
Include all relevant dipoles, lone pairs and curly arrows in your answer.
H H H
–
C O H3C C O H 3C C OH
H 3C CN CN
C– H
C
N C–
N
N
[3]
(ii) Name the functional groups present in the product of reaction 3.
........................................................................................................................................ [2]
(c)
Draw the structure of the organic molecule W formed in reaction 4.
[1]
[Total: 12]

12
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To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge
Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download
at www.cambridgeinternational.org after the live examination series.
Cambridge Assessment International Education is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of the University of
Cambridge Local Examinations Syndicate (UCLES), which itself is a department of the University of Cambridge.
© UCLES 2020 9701/22/M/J/20


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Cambridge International AS & A Level

You must answer on the question paper.

You will need: Data booklet

This document has 12 pages. Blank pages are indicated.

Answer all the questions in the spaces provided.

1 Gallium is an element in Group 13.

(a) Explain what is meant by the term relative atomic mass.

Show your working.

 relative atomic mass = .............................. [2]

(c) Complete the table which describes a gaseous atom of gallium.

total number type of orbital which

© UCLES 2020 9701/22/M/J/20

bond angle .................................................................

© UCLES 2020 9701/22/M/J/20 [Turn over

2 Nitric acid can be made in a 3-stage process.

2NO + O2 2NO2 ∆H = –114 kJ mol–1

3NO2 + H2O → 2HNO3 + NO

(a) Write an equation to show the reaction occurring in stage 1.

3NO2 + H2O → 2HNO3 + NO

(ii) Explain why the reaction in stage 3 is described as a disproportionation reaction.

© UCLES 2020 9701/22/M/J/20

Stage 3 3NO2 + H2O → 2HNO3 + NO

NH3 + HNO3 → NH4NO3

Show your working.

 volume of nitrogen dioxide = .............................. [3]

(f) State one use of ammonium nitrate.

© UCLES 2020 9701/22/M/J/20 [Turn over

(a) Suggest a name for this type of reaction.

(c) Reaction A occurs faster in the presence of an enzyme. This is reaction B.

(i) The activation energy for reaction B is +29 kJ mol–1.

Predict a value for the activation energy of reaction A.

(ii) The enthalpy change for reaction A is –14 kJ mol–1.

Predict a value for the enthalpy change for reaction B.

© UCLES 2020 9701/22/M/J/20

Show your working.

 enthalpy change of combustion of sucrose = .............................. kJ mol–1

© UCLES 2020 9701/22/M/J/20 [Turn over

A test is carried out to identify the halogen present in Q.

(i) Suggest the identity of X.

(iii) Describe a further test which would confirm the identity of X.

expected result ....................................................................................................................

© UCLES 2020 9701/22/M/J/20

The major organic product of each of these reactions is methylpropene.

(iii) Draw the skeletal formula of methylpropene.

(iv) Give the names of P and R.

© UCLES 2020 9701/22/M/J/20 [Turn over

(a) Complete the table to give

name of name of reagents

© UCLES 2020 9701/22/M/J/20

(ii) Name the functional groups present in the product of reaction 3.

© UCLES 2020 9701/22/M/J/20 [Turn over

© UCLES 2020 9701/22/M/J/20

You might also like

1 Gallium is an element in Group 13.

(a) Explain what is meant by the term relative atomic mass.

Show your working.

relative atomic mass = .............................. [2]

(c) Complete the table which describes a gaseous atom of gallium.

2 Nitric acid can be made in a 3-stage process.

(a) Write an equation to show the reaction occurring in stage 1.

(ii) Explain why the reaction in stage 3 is described as a disproportionation reaction.

Show your working.

volume of nitrogen dioxide = .............................. [3]

(f) State one use of ammonium nitrate.

(a) Suggest a name for this type of reaction.

(c) Reaction A occurs faster in the presence of an enzyme. This is reaction B.

(i) The activation energy for reaction B is +29 kJ mol–1.

Predict a value for the activation energy of reaction A.

(ii) The enthalpy change for reaction A is –14 kJ mol–1.

Predict a value for the enthalpy change for reaction B.

Show your working.

enthalpy change of combustion of sucrose = .............................. kJ mol–1

A test is carried out to identify the halogen present in Q.

(i) Suggest the identity of X.

(iii) Describe a further test which would confirm the identity of X.

The major organic product of each of these reactions is methylpropene.

(iii) Draw the skeletal formula of methylpropene.

(iv) Give the names of P and R.

(a) Complete the table to give

(ii) Name the functional groups present in the product of reaction 3.