Exam (elaborations)
AS & A Level CHEMISTRY 9701/21 Paper 2 AS Level Structured Questions May/June 2023 Authentic Marking Scheme
AS & A Level CHEMISTRY 9701/21 Paper 2 AS Level Structured Questions May/June 2023 Authentic Marking Scheme
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Cambridge International AS & A Level* 6 8 8 7 0 9 1 3 6 7 *
CHEMISTRY 9701/21
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 16 pages. Any blank pages are indicated.
DC (LK/FC) 308405/5
© UCLES 2023 [Turn over
, 2
1 Tellurium is an element in Group 16. The most common isotope of tellurium is 130Te. Its electronic
configuration is [Kr] 4d10 5s2 5p4.
(a) Complete Table 1.1.
Table 1.1
number of number of
nucleon number
neutrons electrons
130Te
[3]
(b) Identify the sub-shell in an atom of Te that contains electrons with the lowest energy.
............................................................................................................................................. [1]
(c) Construct an equation to represent the first ionisation energy of Te.
............................................................................................................................................. [1]
(d) (i) The radius of Te ions decreases after each successive ionisation.
State two factors that are responsible for the increase in the first six ionisation energies
of Te.
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) Sketch a graph in Fig. 1.1 to show the trend in the first seven ionisation energies of Te.
ionisation
energy / kJ mol–1
0
0 1 2 3 4 5 6 7
successive ionisation
Fig. 1.1
[2]
© UCLES 2023 9701/21/M/J/23
, 3
(e) Te reacts with F2 at 150 °C to form TeFx. Molecules of TeFx are octahedral with bond angles
of 90°.
Explain why TeFx is octahedral with bond angles of 90°.
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [2]
(f) TeFx reacts with water to form tellurium hydroxide and HF. The oxidation number of tellurium
does not change during this reaction.
(i) Construct an equation for the reaction of TeFx with water.
..................................................................................................................................... [1]
(ii) Name the type of reaction that occurs when TeFx reacts with water.
..................................................................................................................................... [1]
[Total: 13]
© UCLES 2023 9701/21/M/J/23 [Turn over
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