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GCSE
CHEMISTRY
Higher Tier Paper 2
H
Tuesday 13 June 2023 Morning Time allowed: 1 hour 45 minutes
Materials
For this paper you must have: For Examiner’s Use
a ruler
a scientific calculator Question Mark
the periodic table (enclosed). 1
2
Instructions
Use black ink or black ball-point pen. 3
Pencil should only be used for drawing. 4
Fill in the boxes at the top of this page.
5
Answer all questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 6
If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
Do all rough work in this book. Cross through any work you do not want
to be marked. 9
In all calculations, show clearly how you work out your answer. 10
TOTAL
Information
The maximum mark for this paper is 100.
The marks for questions are shown in brackets.
You are expected to use a calculator where appropriate.
You are reminded of the need for good English and clear presentation
in your answers.
, 2
Do not write
outside the
0 1 box
A student investigated the rate of the reaction between zinc and sulfuric acid.
Hydrogen gas is produced during this reaction.
Figure 1 shows the apparatus.
Figure 1
This is the method used.
1. Add 50 cm3 of sulfuric acid to a conical flask.
2. Add 2.0 g of zinc to the conical flask.
3. Quickly put a stopper in the conical flask and start a timer.
4. Measure the time taken to collect 20 cm3 of gas.
5. Repeat steps 1 to 4 three more times.
0 1 . 1 Suggest why the stopper must be put in the conical flask as quickly as possible in
step 3.
[1 mark]
, Do not write
outside the
0 1 . 2 The student calculated the rate of the reaction for each trial. box
Table 1 shows the results of the calculations.
Table 1
Trial 1 Trial 2 Trial 3 Trial 4
Rate of reaction in cm3/s 0.78 0.81 0.68 0.81
Determine the mean time taken to collect 20 cm3 of gas.
Do not include any anomalous results.
Use the equation:
volume of gas collected
mean rate of reaction =
mean time taken
[5 marks]
, 3
Mean time taken = s
Question 1 continues on the next page
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