0653.C6.2.01 — Describe the effect on the rate of reaction of: 5 Explain the effect on the rate of reaction of: (a). changing the concentration of solution: past paper questions
Real questions on 0653.c6.2.01 — describe the effect on the rate of reaction of: 5 explain the effect on the rate of reaction of: (a). changing the concentration of solution
The newest 20 of 29 written questions. Open one to see it on the real paper.
- 0653/31 · October/November 2025 · Q4b(ii)[2]
The volume of gas produced in 60 seconds is 22.6 cm 3 . Calculate the rate of reaction in cm 3 per second. rate of reaction = cm 3 per second Give your answer to two decimal places.
See it on the paper → - 0653/31 · October/November 2025 · Q4b(iii)[2]
Manganese( IV ) oxide is a catalyst for this reaction. Describe what is meant by a catalyst.
See it on the paper → - 0653/43 · October/November 2025 · Q4b(i)[1]
Calculate the rate of reaction in cm 3 per s for magnesium carbonate powder. Write your answer in Table 4.1. (i)
See it on the paper → - 0653/43 · October/November 2025 · Q4b(ii)[3]
State and explain how the size of the magnesium carbonate pieces affects the rate of this reaction.
See it on the paper → - 0653/31 · May/June 2025 · Q4d[1]
Iron is used as a catalyst in a reaction to make ammonia. Describe the effect of a catalyst on the rate of reaction.
See it on the paper → - 0653/32 · May/June 2025 · Q6e[1]
Predict the effect of this change on the reaction. (e) The temperature of the hydrogen peroxide is increased. All other conditions stay the same.
See it on the paper → - 0653/61 · May/June 2025 · Q3a(i)[2]
Fig. 3.1 shows the readings from the stop‑watch for 15 cm 3 and 10 cm 3 of aqueous H. 10 cm 3 of aqueous H 15 cm 3 of aqueous H 0:42.61 min 1:52.34 sec min sec Fig. 3.1 Record in Table 3.1 these reaction times to the nearest second.
See it on the paper → - 0653/61 · May/June 2025 · Q3a(ii)[1]
State the relationship between the volume of aqueous H and the reaction time. Use information from Table 3.1.
See it on the paper → - 0653/61 · May/June 2025 · Q3a(iii)[2]
Calculate the rate of reaction for 15 cm 3 and 10 cm 3 of aqueous H. Use the equation shown. rate of reaction = 30 reaction time Record in Table 3.1 these values to two significant figures.
See it on the paper → - 0653/61 · May/June 2025 · Q3a(iv)[1]
State the relationship between the volume of aqueous H and the rate of reaction. Use information from Table 3.1.
See it on the paper → - 0653/61 · May/June 2025 · Q3a(v)[1]
State the name of a piece of apparatus suitable to measure the volumes of aqueous H.
See it on the paper → - 0653/61 · May/June 2025 · Q3a(vi)[1]
Explain why in step 4 it is important that all the magnesium is under the surface of aqueous H.
See it on the paper → - 0653/61 · May/June 2025 · Q3a(vii)[1]
Explain why in step 7 it is important the beaker and stirrer are rinsed.
See it on the paper → - 0653/21 · October/November 2024 · Q20[1]
Which statement explains how decreasing the concentration of reactants affects the rate of a reaction?
See it on the paper → - 0653/33 · May/June 2024 · Q2b(iii)[1]
Suggest one change to increase the rate of the reaction of iron with dilute hydrochloric acid.
See it on the paper → - 0653/43 · May/June 2024 · Q2a(i)[3]
Complete the energy level diagrams shown in Fig. 2.1 and Fig. 2.2 by labelling: • • the activation energy the energy change of reaction.
See it on the paper → - 0653/43 · May/June 2024 · Q2a(ii)[2]
The following statements are about the reactions shown in Fig. 2.1 and Fig. 2.2. Put one tick (✓) for each statement to show if it is true or false. statement true false The reaction between nitrogen and oxygen is exothermic. When nitrogen monoxide reacts with oxygen, the energy given out is greater than the energy tak...
See it on the paper → - 0653/33 · October/November 2023 · Q2b(iii)[1]
Suggest one way the student can increase the rate of this reaction.
See it on the paper → - 0653/61 · October/November 2023 · Q1a(iv)[1]
Use your answer in (a)(i) to decide if temperature is a source of error in this investigation. Tick (✓) the appropriate box and explain your decision. temperature is a source of error temperature is not a source of error explanation
See it on the paper → - 0653/61 · October/November 2023 · Q1a(v)[1]
Identify one source of error in step 2. Suggest a suitable piece of apparatus to overcome this error. error apparatus
See it on the paper →
What examiners said
Most candidates knew that catalysts increase the rate of reaction.
— Examiner report, May/June 2025, 0653/31 Q4(d) (Cambridge)
Many candidates successfully predicted that the increase in temperature increases the rate of reaction.
— Examiner report, May/June 2025, 0653/32 Q6(e) (Cambridge)
Most candidates correctly read the stop-watches and converted the times to seconds. As candidates were specifically asked to record times to the nearest second, answers that included any decimal places were not awarded credit.
— Examiner report, May/June 2025, 0653/61 Q3(a)(i) (Cambridge)
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