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AS & A Level CHEMISTRY 9701/23 Paper 2 AS Level Structured Questions May/June 2023 Authentic Marking Scheme
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AS & A Level CHEMISTRY 9701/23 Paper 2 AS Level Structured Questions May/June 2023
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Cambridge International AS & A Level* 3 5 0 8 5 0 7 4 0 9 *
CHEMISTRY 9701/23
Paper 2 AS Level Structured Questions May/June 2023
1 hour 15 minutes
You must answer on the question paper.
No additional materials are needed.
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 and use appropriate units.
INFORMATION
● The total mark for this paper is 60.
● The number of marks for each question or part question is shown in brackets [ ].
● The Periodic Table is printed in the question paper.
● Important values, constants and standards are printed in the question paper.
This document has 20 pages. Any blank pages are indicated.
DC (LK/JG) 308408/5
© UCLES 2023 [Turn over
, 2
1 Copper is used in electrical equipment. It has a melting point of 1085 °C.
(a) (i) Identify the lattice structure of copper.
..................................................................................................................................... [1]
(ii) Draw a labelled diagram to show the bonding present in copper.
[1]
(b) The relative isotopic masses and natural abundances of the two isotopes in a sample of
copper are shown in Table 1.1.
Table 1.1
isotope relative isotopic mass % abundance
63Cu 62.930 69.15
65Cu 64.928 30.85
(i) Define the unified atomic mass unit.
...........................................................................................................................................
..................................................................................................................................... [1]
(ii) Define relative atomic mass, Ar , in terms of the unified atomic mass unit.
...........................................................................................................................................
..................................................................................................................................... [1]
(iii) Calculate the relative atomic mass, Ar , of copper in this sample using the data in
Table 1.1.
Show your working.
Ar = .............................. [1]
© UCLES 2023 9701/23/M/J/23
, 3
(c) The mass spectrum of a sample of pure copper is shown in Fig. 1.1.
50 46%
40
% abundance 30
23%
21%
20
10%
10
0
31.5 32.5 63 65
m/e
Fig. 1.1
Identify the ion with an abundance of 23% in the sample.
............................................................................................................................................. [1]
(d) When KI(aq) is added to CuSO4(aq) the blue-coloured solution turns brown and a white
precipitate of CuI(s) is seen.
The reaction between copper ions and iodide forms only two products.
(i) Complete the equation for this reaction.
............Cu2+ + ...........I– ...........CuI + ...................................
[1]
(ii) Identify the oxidising agent in this reaction. Explain your answer in terms of electron
transfer.
...........................................................................................................................................
..................................................................................................................................... [1]
(iii) State the full electronic configuration of Cu2+.
..................................................................................................................................... [1]
[Total: 9]
© UCLES 2023 9701/23/M/J/23 [Turn over
, 4
2 (a) The reaction of pure aluminium is only observed if the aluminium oxide layer is removed first.
When pure aluminium is added to cold water, bubbles of gas are seen.
(i) State one property of aluminium oxide that explains why an aluminium object does not
react with cold water until the aluminium oxide layer is removed.
..................................................................................................................................... [1]
(ii) Write an equation, with state symbols, for the reaction of aluminium oxide with an excess
of NaOH(aq).
..................................................................................................................................... [2]
(iii) Name one other Period 3 element that also produces bubbles of gas when added to cold
water.
..................................................................................................................................... [1]
(b) Aluminium nitrate is a white soluble salt. On heating aluminium nitrate, thermal decomposition
occurs and a brown gas is seen.
State the formula of the salt of another element in Period 3 which also decomposes on
heating to produce a brown gas.
............................................................................................................................................. [1]
(c) Aluminium chloride and phosphorus chloride are both white solids.
(i) State the maximum oxidation number of aluminium and of phosphorus in these solid
chloride salts.
maximum oxidation number of aluminium .............................................
maximum oxidation number of phosphorus ..........................................
[1]
(ii) State why the maximum oxidation number of aluminium is different from that of
phosphorus.
...........................................................................................................................................
..................................................................................................................................... [1]
(iii) Write an equation for the reaction of solid phosphorus chloride and excess water.
..................................................................................................................................... [1]
© UCLES 2023 9701/23/M/J/23
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