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5 marksQualitative Analysis

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

A student conducts tests on an aqueous solution of Compound X, with some observations and inferences recorded in Table 2.

Complete Table 2 by filling in the missing observations and inferences.

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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(c)(i)Draw a CLEARLY labelled diagram of a suitable experimental arrangement for carrying out the investigation in the laboratory.[2 marks]
  8. 1(c)(ii)State TWO variables that should be controlled during the experiment.[2 marks]

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