May/June 2026 Paper 62

2026 · 4 questions · 22 parts · 40 marks

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1(a)1(b)(i)1(b)(ii)1(c)1(d)1(e)

–/8 mks

2(a)2(b)2(c)(i)2(c)(ii)2(d)2(e)(i)2(e)(ii)2(f)(i)2(f)(ii)2(g)

–/19 mks

3(a)3(b)3(c)3(d)3(e)

–/7 mks

–/6 mks

Context for question 2

A student investigates the volume of gas made in 75 seconds when dilute ethanoic acid reacts with solid sodium hydrogencarbonate. The student does five experiments using the apparatus shown in Figure 2.1.

Figure 2.1, a 250 cm3 conical flask with a stopper and rubber delivery tube leading under water in a trough to an inverted 100 cm3 measuring cylinder held by a clamp.

Experiment 1

Use a 10 cm $^{3}$ measuring cylinder to pour 10.0 cm $^{3}$ of dilute ethanoic acid into a 250 cm $^{3}$ conical flask.
Use a 100 cm $^{3}$ measuring cylinder to pour 100 cm $^{3}$ of distilled water into the conical flask. Swirl the flask to mix the contents.
Set up the apparatus as shown in Figure 2.1. Ensure the inverted measuring cylinder is full of water.
Remove the stopper from the conical flask.
Add 1 g of solid sodium hydrogencarbonate to the conical flask. Do not mix the contents of the flask. Immediately replace the bung and start the stop-watch.
Measure the volume of gas collected in the inverted measuring cylinder at 75 seconds.
Rinse the conical flask with distilled water.

Experiment 2

Repeat Experiment 1 using 90 cm $^{3}$ of distilled water instead of 100 cm $^{3}$ .

Experiment 3

Repeat Experiment 1 using 80 cm $^{3}$ of distilled water instead of 100 cm $^{3}$ .

Experiment 4

Repeat Experiment 1 using 70 cm $^{3}$ of distilled water instead of 100 cm $^{3}$ .

Experiment 5

Repeat Experiment 1 using 60 cm $^{3}$ of distilled water instead of 100 cm $^{3}$ .

2(a)Medium3 marks

Use the information in the descriptions of the experiments and the measuring cylinder diagrams to complete Table 2.1.

Table 2.1, rows for Experiments 1 to 5 with columns for volume of dilute ethanoic acid, volume of distilled water, a measuring-cylinder diagram and volume of gas collected in 75 seconds; only Experiment 1's acid volume (10.0) is filled in and each row shows an inverted measuring cylinder with the gas level to be read off.

Your answer

2(b)Medium4 marks

Complete a suitable scale on the

y

-axis and plot your results from Experiments 1 to 5 on Figure 2.2. Draw a line of best fit.

Draw with the mouse or a finger.

2(c)(i)Easy2 marks

The mean rate of reaction is calculated using the equation shown.

mean rate of reaction = \frac{volume of gas collected}{time taken to collect the gas}

Calculate the mean rate of reaction in Experiment 3. Give units for the mean rate you have calculated.

mean rate of reaction =

units

2(c)(ii)Easy1 mark

State which Experiment, 1, 2, 3, 4 or 5, has the highest mean rate of reaction.

2(d)Medium3 marks

Use your graph in Figure 2.2 to predict the volume of gas collected in 75 seconds if the volume of distilled water is 77 cm

^{3}

. Show your working on Figure 2.2.

volume =

2(e)(i)Easy1 mark

The volume of the dilute ethanoic acid is measured using a 10 cm

^{3}

measuring cylinder. State why a 10 cm

^{3}

measuring cylinder is used rather than a 50 cm

^{3}

measuring cylinder to measure the volume of the dilute ethanoic acid.

2(e)(ii)Medium1 mark

The volume of the dilute ethanoic acid can be measured using a 10

cm^{3}

volumetric pipette. State one advantage of using a 10

cm^{3}

volumetric pipette rather than a 10

cm^{3}

measuring cylinder to measure the volume of the dilute ethanoic acid.

2(f)(i)Medium1 mark

Some of the gas made in the reaction escapes from the conical flask before the stopper is replaced in the flask. State the effect, if any, the gas escaping has on the volume of gas collected in 75 seconds.

2(f)(ii)Medium2 marks

Deduce in which experiment the most gas would escape. Explain your answer.

Your answer

2(g)Easy1 mark

Sketch a line on Figure 2.2 to show the results that would be obtained if the experiment is repeated with 20.0

cm^{3}

of dilute ethanoic acid instead of 10.0

cm^{3}

Draw with the mouse or a finger.