GCE Chemistry
BH033/02: Chemistry
in depth AS Level
Oxford
cambridge
and rsa
2024
Ocr 2024
, Oxford Cambridge and RSA
Tuesday 21 May 2024 – Morning
AS Level Chemistry B (Salters)
H033/02 Chemistry in depth
Time allowed: 1 hour 30 minutes
You must have:
• the Data Sheet for Chemistry B
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 begiven
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 is an exempt Charity
Turn over
, 2
1 ‘Lo Salt’ is a reduced-sodium alternative to regular table salt. Some of the sodium chloride is
replaced by potassium chloride.
(a) Two models of the structure of sodium chloride are shown below in Fig. 1.1 and Fig. 1.2.
Fig. 1.1
Na+
Cl –
Fig. 1.2
Na+Cl
–
The two models show different features of the structure.
Complete the table with ticks (✓) where a statement is correct for a model.
Correct for Correct for
Fig. 1.1 Fig. 1.2
Model shows the relative sizes of ions
Model shows how the ions pack together
Model allows all the ions in the model to be seen
[2]
(c) A student has a solid sample of an unknown ionic chloride.
The student uses the following method to calculate the percentage by mass of chlorine in thesolid:
• Weigh out 0.94 g of solid and dissolve in deionised water.
• Add excess silver nitrate solution so AgCl precipitates.
• Collect and dry the precipitate. It weighs 2.29 g.
(i) Calculate the percentage by mass of chlorine in the unknown solid.
percentage by mass of chlorine = ...................................................................% [3]
(ii) The student fails to dry the AgCl precipitate fully.
What effect would this have on the percentage by mass of chlorine calculated?
Explain your answer.
..........................................................................................................................................................
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