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AS Level Chemistry A H032/02 Depth in chemistry
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Oxford Cambridge and RSATuesday 12 October 2021 – Morning
AS Level Chemistry A
H032/02 Depth in chemistry
Time allowed: 1 hour 30 minutes
You must have:
*8937841650*
• the Data Sheet for Chemistry A
You can use:
• a scientific or graphical calculator
• an HB pencil
*H03202*
Please write clearly in black ink.Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be given
for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 16 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2021 [601/5256/4] DC (ST/CT) 301076/4
OCR is an exempt Charity
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2
Answer all the questions.
1 This question is about compounds of sulfur.
(a) Potassium sulfide, K2S, shows ionic bonding.
(i) Explain what is meant by ionic bonding.
...........................................................................................................................................
...................................................................................................................................... [1]
(ii) Draw a ‘dot-and-cross’ diagram to show the bonding in K2S.
Show outer electrons only.
[2]
(b) Sulfur difluoride, SF2, shows covalent bonding.
Draw a ‘dot-and-cross’ diagram to show the bonding in SF2.
Show outer electrons only.
[2]
(c) At room temperature, K2S is a solid, but SF2 is a gas.
Use ideas about structure and bonding to explain this difference.
..................................................................................................................................................
.
..................................................................................................................................................
.
© OCR 2021
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3
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[3]
(d) Sulfur hexafluoride, SF6, is used in medical ultrasound imaging because SF6 is
unreactive.
(i) State the shape of, and F—S—F bond angle in, an SF6 molecule.
Shape .................................................................................
Bond angle .........................................................................
[2]
(ii) Suggest why SF6 is unreactive.
...........................................................................................................................................
...................................................................................................................................... [1]
2 Alkane A, shown below, reacts with bromine in a radical substitution reaction.
CH3
C
H3C H
CH3
Alkane A
(a) What is meant by a radical?
.............................................................................................................................................. [1]
(b) Name the type of bond breaking that occurs in a radical substitution reaction.
.............................................................................................................................................. [1]
© OCR 2021 Turn over
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