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#O C R AS Level Chemistry A H032/02 Depth in chemistry May 2023
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#O C R AS Level Chemistry A H032/02 Depth in chemistry May 2023
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#O C RAS Level Chemistry A
H032/02 Depth in chemistry
May 2023
Time allowed: 1 hour 30 minutes
You must have:
the Data Sheet for Chemistry A
You can use:
a scientific or graphical calculator
an HB pencil
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.
,2023
Turn over
, 2
1 This question is about titanium (atomic number 22) and its compounds.
(a) Titanium exists as a mixture of five isotopes.
A chemist analyses a sample of titanium using mass spectrometry.
The results are shown in the table below.
Isotope Abundance (%)
46Ti 8.30
47Ti 7.40
48Ti 73.70
49Ti 5.40
50Ti 5.20
(i) Calculate the relative atomic mass of titanium in the sample.
Give your answer to 2 decimal places.
relative atomic mass =...........................................................[2]
(ii) Complete the electron configuration of a titanium atom.
1s2.....................................................................................................................................................................................[1]
(iii) Complete the table to show the number of protons, neutrons and electrons in a
48 2+
Ti ion.
Protons Neutrons Electrons
48
Ti2+ ion
[1]
2023
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