AQA GCSE CHEMISTRY Higher Tier Paper 2 June 2023

AQA


GCSE
CHEMISTRY
Higher Tier Paper 2

June 2023

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0 1 A student investigated the rate of the reaction between zinc and sulfuric acid. box



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]




IB/M/Jun23/8462/2H

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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]




Mean time taken = s




Question 1 continues on the next page




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IB/M/Jun23/8462/2H