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2 marksRates of Reaction

CSEC Chemistry · May/June 2010 · Paper 2 · Question 1(c)(ii)

You are required to plan and design an experiment to compare the effects of the catalysts manganese(IV) oxide and catalase on the rate of decomposition of hydrogen peroxide.

State TWO variables that should be controlled during the experiment.

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Other parts of this question

  1. 1(a)(i)Identify the parts labelled A, B, C, D on the diagram.[4 marks]
  2. 1(a)(ii)Write a balanced equation to show the decomposition of hydrogen peroxide by manganese(IV) oxide (MnO₂).[2 marks]
  3. 1(a)(iii)Using the same axes as the graph (Figure 1) on page 3, plot a graph of the volume of oxygen against time using the data in Table 1. The first three points have…[3 marks]
  4. 1(a)(iv)Compare the plots obtained from Jonathan's and Karen's results in terms of the slope of the graph and the volume of oxygen produced. Account for the…[4 marks]
  5. 1(a)(v)a)Using Karen's graph, determine the volume of oxygen produced in 45 seconds.[1 mark]
  6. 1(a)(v)b)Determine the number of moles of oxygen produced in 45 seconds at RTP (room temperature and pressure). (1 mole of gas occupies 24 dm³ at RTP: Relative Atomic…[2 marks]
  7. 1(b)Complete Table 2 by filling in the missing observations and inferences.[5 marks]
  8. 1(c)(i)Draw a CLEARLY labelled diagram of a suitable experimental arrangement for carrying out the investigation in the laboratory.[2 marks]

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