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Rates of Reaction · CAPE Chemistry Unit 1

64 past-paper questions on Rates of Reaction, part of Kinetics and Equilibria, from every CAPE Chemistry Unit 1 paper on Quelpr.

Practise Rates of Reaction
  1. 2(a)(i)3 marks· CAPE Chemistry Unit 1 · 2021 · Paper 2Using the data from Experiment 1 in Table 1, calculate a value for the rate constant, k, and state its units.
  2. 2(a)(ii)4 marks· CAPE Chemistry Unit 1 · 2021 · Paper 2Complete Table 1 by inserting the missing initial [Q], initial [R] and initial rate for the reaction between Q and R.
  3. 2(a)(iii)1 mark· CAPE Chemistry Unit 1 · 2021 · Paper 2The order of the reaction with respect to R is 2. State the meaning of the term 'order of reaction' with respect to R.
  4. 2(a)(iv)1 mark· CAPE Chemistry Unit 1 · 2021 · Paper 2Deduce the overall order of the reaction between Q and R.
  5. 2(b)2 marks· CAPE Chemistry Unit 1 · 2021 · Paper 2A fixed mass of marble lumps is reacted with dilute hydrochloric acid at a constant temperature. Outline why the rate of the reaction would increase if the lumps of marble are reduced in size.
  6. 2(b)(i)2 marks· CAPE Chemistry Unit 1 · May/June 2022 · Paper 2Define the term 'rate of reaction'.
  7. 2(b)(ii)4 marks· CAPE Chemistry Unit 1 · May/June 2022 · Paper 2Explain how catalysts and surface area affect the rate of a chemical reaction.
  8. 2(c)(i)4 marks· CAPE Chemistry Unit 1 · May/June 2022 · Paper 2Use ONLY the data in Table 4 to determine the order of reaction with respect to S2O8^2- and I^-.
  9. 2(c)(ii)1 mark· CAPE Chemistry Unit 1 · May/June 2022 · Paper 2Based on your answer in (c)(i), determine the overall order of the reaction.
  10. 2(c)(iii)2 marks· CAPE Chemistry Unit 1 · May/June 2022 · Paper 2Determine the rate law for the reaction.
  11. 2(h)2 marks· CAPE Chemistry Unit 1 · May/June 2024 · Paper 2Define the term 'half-life'.
  12. 2(i)2 marks· CAPE Chemistry Unit 1 · May/June 2024 · Paper 2Using a Boltzmann distribution curve, show how a catalyst affects the rate of a chemical reaction.
  13. 2(a)2 marks· CAPE Chemistry Unit 1 · May/June 2026 · Paper 2Define the term 'rate of a reaction'.
  14. 2(b)(i)4 marks· CAPE Chemistry Unit 1 · May/June 2026 · Paper 2With reference to the experiment number used, deduce the order of the reaction with respect to Substance A and Substance B.
  15. 2(b)(ii)1 mark· CAPE Chemistry Unit 1 · May/June 2026 · Paper 2Write the rate equation for the reaction between A and B.
  16. 2(b)(iii)2 marks· CAPE Chemistry Unit 1 · May/June 2026 · Paper 2Using the rate equation from (b)(ii), calculate the numerical value of the rate constant k, stating its unit.
  17. 2(b)(iv)2 marks· CAPE Chemistry Unit 1 · May/June 2026 · Paper 2Using the rate equation from (b)(ii), suggest a mechanism for the reaction between A and B.
  18. 2(a)4 marks· Chemistry · Unit 1 Q2 2(a)On the grid provided on page 7, plot a graph of the concentration of butyl chloride, [C₄H₉Cl] on the y-axis against time in seconds, on the x-axis.
  19. 2(a)2 marks· Chemistry · Unit 1 Q2 2(a)State TWO factors which affect reaction rates.
  20. 2(b)1 mark· Chemistry · Unit 1 Q2 2(b)Using your graph, estimate the concentration of butyl chloride at t = 400 s.
  21. 2(b)(i)2 marks· Chemistry · Unit 1 Q2 2(b)(i)Complete Table 1 by writing the missing values for 1/[NO2].
  22. 2(b)(ii)2 marks· Chemistry · Unit 1 Q2 2(b)(ii)Plot a graph of 1/[NO2] against time, on the grid below. The first and last points have been plotted on the grid.
  23. 2(b)(iii)2 marks· Chemistry · Unit 1 Q2 2(b)(iii)From your graph, determine the order of the reaction with respect to NO2. Give a reason for your answer.
  24. 2(b)(iv)1 mark· Chemistry · Unit 1 Q2 2(b)(iv)State the rate law for the reaction.
  25. 2(b)(v)2 marks· Chemistry · Unit 1 Q2 2(b)(v)Use the slope of the graph to determine the value and units of the rate constant, k, for the reaction.
  26. 2(c)2 marks· Chemistry · Unit 1 Q2 2(c)Several experimental methods, including titrimetry, can be used to determine reaction rates. Suggest TWO OTHER methods which can be used to determine reaction rates.
  27. 2(c)(i)4 marks· Chemistry · Unit 1 Q2 2(c)(i)Using suitable well-labelled diagrams, explain how EACH of the following affects reaction rates: Catalysts
  28. 2(c)(i)1 mark· Chemistry · Unit 1 Q2 2(c)(i)Deduce the order of the reaction.
  29. 2(c)(ii)4 marks· Chemistry · Unit 1 Q2 2(c)(ii)Using suitable well-labelled diagrams, explain how EACH of the following affects reaction rates: Temperature
  30. 2(c)(ii)2 marks· Chemistry · Unit 1 Q2 2(c)(ii)Calculate the rate constant for the decomposition.
  31. 2(d)2 marks· Chemistry · Unit 1 Q2 2(d)Name TWO industrial processes in which catalysts are used.
  32. 2(d)2 marks· Chemistry · Unit 1 Q2 2(d)Outline TWO experimental steps in the determination of the reaction rate of an esterification reaction using titrimetry.
  33. 2(d)(ii)4 marks· Chemistry · Unit 1 Q2 2(d)(ii)Outline an alternative experimental method to determine the rate of decomposition of HOX at room temperature.
  34. 5(a)(i)4 marks· Chemistry · Unit 1 Q5 5(a)(i)With the aid of appropriate Boltzmann distribution curves, (using the axes provided on page 12) describe the effect of Temperature on reaction rates.
  35. 5(a)(i)2 marks· Chemistry · Unit 1 Q5 5(a)(i)Explain EACH of the following terms: Rate law
  36. 5(a)(i)2 marks· Chemistry · Unit 1 Q5 5(a)(i)State and explain the effect of EACH of the following on the rate of a chemical reaction: A catalyst
  37. 5(a)(ii)2 marks· Chemistry · Unit 1 Q5 5(a)(ii)Explain EACH of the following terms: Order of reaction
  38. 5(a)(ii)3 marks· Chemistry · Unit 1 Q5 5(a)(ii)With the aid of appropriate Boltzmann distribution curves, (using the axes provided on page 12) describe the effect of Catalyst on reaction rates.
  39. 5(a)(ii)3 marks· Chemistry · Unit 1 Q5 5(a)(ii)State and explain the effect of EACH of the following on the rate of a chemical reaction: Concentration of the reactants
  40. 5(b)(i)5 marks· Chemistry · Unit 1 Q5 5(b)(i)Use the information from the table to deduce the rate equation and calculate the overall order of the reaction.
  41. 5(b)(i)2 marks· Chemistry · Unit 1 Q5 5(b)(i)Use the data given in Table 1 to calculate the order of the reaction with respect to the SO₂Cl₂.
  42. 5(b)(i)2 marks· Chemistry · Unit 1 Q5 5(b)(i)Write an expression for the rate law.
  43. 5(b)(ii)1 mark· Chemistry · Unit 1 Q5 5(b)(ii)Write an expression for the OVERALL order of reaction.
  44. 5(b)(ii)4 marks· Chemistry · Unit 1 Q5 5(b)(ii)Write the rate equation for the reaction and calculate the value and units for the rate constant.
  45. 5(b)(ii)a)2 marks· Chemistry · Unit 1 Q5 5(b)(ii)a)Calculate the rate constant.
  46. 5(b)(ii)b)1 mark· Chemistry · Unit 1 Q5 5(b)(ii)b)Calculate the initial rate of the reaction when [S₂O₃²⁻]₀ = 0.13 mol dm⁻³ and [I⁻]₀ = 0.32 mol dm⁻³.
  47. 5(b)(iii)2 marks· Chemistry · Unit 1 Q5 5(b)(iii)Calculate t₁/₂ for the reaction.
  48. 5(b)(iii)1 mark· Chemistry · Unit 1 Q5 5(b)(iii)The overall order of this reaction was found to follow second-order kinetics. Deduce the units of the rate constant for the reaction.
  49. 5(b)(iv)2 marks· Chemistry · Unit 1 Q5 5(b)(iv)State and explain the effect on the rate of dissociation of SO₂Cl₂, of carrying out the experiment at a higher temperature.
  50. 5(c)3 marks· Chemistry · Unit 1 Q5 5(c)Use the information relating to the kinetics of the reaction to write the equation representing the rate determining step. Give a reason for your response. Equation: Reason:
  51. 5(c)(i)2 marks· Chemistry · Unit 1 Q5 5(c)(i)Sketch a diagram showing the distribution of energies in a gas at a given temperature, T₁.
  52. 5(c)(ii)1 mark· Chemistry · Unit 1 Q5 5(c)(ii)On the same diagram as in 5(c)(i), insert another curve showing the distribution of energies of the molecules at a higher temperature, T₂.
  53. 5(c)(iii)2 marks· Chemistry · Unit 1 Q5 5(c)(iii)Using your sketch, explain the difference in the rates of reaction at temperatures T₁ and T₂.
  54. 5(d)(i)2 marks· Chemistry · Unit 1 Q5 5(d)(i)Plot the data on the grid provided on page 17, circling the plotted points.
  55. 5(d)(ii)2 marks· Chemistry · Unit 1 Q5 5(d)(ii)Using the graph in (d) (i), calculate the rate constant for the decomposition of nitrogen(V) oxide at 333 K, stating the appropriate units.
  56. 161 mark· Chemistry · Unit 1 Q16 16What is the effect on a chemical reaction of introducing a catalyst in it?
  57. 161 mark· Chemistry · Unit 1 Q16 16Which of the following phrases does NOT define the rate of a chemical reaction?
  58. 171 mark· Chemistry · Unit 1 Q17 17The rate law for a given reaction is Rate = k[A]² [B]. What are the units for k?
  59. 171 mark· Chemistry · Unit 1 Q17 17What is the OVERALL order of the reaction?
  60. 191 mark· Chemistry · Unit 1 Q19 19What is the rate constant for the reaction at 629 K?
  61. 201 mark· Chemistry · Unit 1 Q20 20The reaction 2AB(g) → A₂(g) + B₂(g) has the rate law, Rate = k [AB]. If the half-life is 253 s, then the value of the velocity constant (k) at the temperature of the reaction is
  62. 201 mark· Chemistry · Unit 1 Q20 20If the half-life is 253 s, then the value of the velocity constant (k) at the temperature of the reaction is
  63. 241 mark· Chemistry · Unit 1 Q24 24Which of the following graphs represents the order of reaction with respect to propanone?
  64. 251 mark· Chemistry · Unit 1 Q25 25The rate equation for the reaction is

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