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2 marksRates of Reaction

CSEC Chemistry · May/June 2008 · Paper 2 · Question 1(c)

Hydrogen peroxide decomposes slowly at room temperature into water and oxygen, a process that can be accelerated by catalysts. Manganese (IV) oxide, copper oxide, liver extracts, and potato extracts are known catalysts. The task is to design an experiment to find the most effective catalyst among these for hydrogen peroxide decomposition.

Plan and design an experiment to determine which of the four catalysts above will be most effective in increasing the rate of decomposition of hydrogen peroxide. Write your answer in the spaces provided. Outline of method (include the variables controlled):

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Other parts of this question

  1. 1(a)(i)a)What is meant by EACH of the following? pH scale[4 marks]
  2. 1(a)(i)b)What is meant by EACH of the following? The end point of an acid-base titration[4 marks]
  3. 1(a)(ii)Complete Table 1 below by recording the missing pH meter readings from Figure 1.[2 marks]
  4. 1(a)(iii)Using the graph paper provided on page 5 and the data in Table 1, plot a graph of pH against volume of sodium hydroxide added.[3 marks]
  5. 1(a)(iv)Use the graph to determine the volume of sodium hydroxide which reacts completely with the 20 cm³ of 0.005 mol dm⁻³ sulphuric acid.[1 mark]
  6. 1(a)(v)a)Calculate EACH of the following: The number of moles of sulphuric acid in 20 cm³ of the sulphuric acid used[2 marks]
  7. 1(a)(v)b)Calculate EACH of the following: The number of moles of sodium hydroxide in the volume of sodium hydroxide used in (a) (iv)[2 marks]
  8. 1(a)(v)c)Calculate EACH of the following: The number of moles of sodium hydroxide in 1 dm³ of this solution[1 mark]
  9. 1(b)Complete Table 2 by filling in the inferences that could be made based on the observations recorded.[1 mark]
  10. 1(c) (diagram)Labelled diagram of apparatus to be used:[2 marks]

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