, Oxford Cambridge and RSA
Tuesday 23 May 2023 – Morning
AS Level Chemistry A
H032/02 Depth in chemistry
Time allowed: 1 hour 30 minutes
You must have:
* 9 8 8 0 6 6 0 3 8 8 *
• the Data Sheet for Chemistry A
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 2 0 2 *
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 2023 [601/5256/4] OCR is an exempt Charity
DC (CJ/JG) 315871/7 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
48Ti2+
ion.
Protons Neutrons Electrons
48Ti2+ ion
[1]
© OCR 2023
, 3
(b) An ore of titanium contains impure TiO2.
Titanium is manufactured from TiO2 in a two-stage process.
Stage 1 TiO2 + 2C + 2Cl 2 TiCl4 + 2CO Reaction 1.1
Stage 2 TiCl4 + 4Na Ti + 4NaCl Reaction 1.2
(i) The common name for TiO2 is titanium dioxide.
What is the systematic name of TiO2?
...................................................................................................................................... [1]
(ii) In Reaction 1.2, the percentage yield of titanium from TiCl4 is 72.0%.
Calculate the minimum mass, in kg, of sodium that is needed to produce 1.00 kg of
titanium.
Give your answer to 3 significant figures.
mass of sodium = ..................................................... kg [4]
(iii) Reaction 1.2 produces a mixture of titanium and sodium chloride.
Suggest how titanium could be separated from this mixture at room temperature.
Explain your answer.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
© OCR 2023 Turn over
Tuesday 23 May 2023 – Morning
AS Level Chemistry A
H032/02 Depth in chemistry
Time allowed: 1 hour 30 minutes
You must have:
* 9 8 8 0 6 6 0 3 8 8 *
• the Data Sheet for Chemistry A
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 0 3 2 0 2 *
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 2023 [601/5256/4] OCR is an exempt Charity
DC (CJ/JG) 315871/7 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
48Ti2+
ion.
Protons Neutrons Electrons
48Ti2+ ion
[1]
© OCR 2023
, 3
(b) An ore of titanium contains impure TiO2.
Titanium is manufactured from TiO2 in a two-stage process.
Stage 1 TiO2 + 2C + 2Cl 2 TiCl4 + 2CO Reaction 1.1
Stage 2 TiCl4 + 4Na Ti + 4NaCl Reaction 1.2
(i) The common name for TiO2 is titanium dioxide.
What is the systematic name of TiO2?
...................................................................................................................................... [1]
(ii) In Reaction 1.2, the percentage yield of titanium from TiCl4 is 72.0%.
Calculate the minimum mass, in kg, of sodium that is needed to produce 1.00 kg of
titanium.
Give your answer to 3 significant figures.
mass of sodium = ..................................................... kg [4]
(iii) Reaction 1.2 produces a mixture of titanium and sodium chloride.
Suggest how titanium could be separated from this mixture at room temperature.
Explain your answer.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
© OCR 2023 Turn over
