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3 marksRates of Reaction

CSEC Chemistry · January 2016 · Paper 2 · Question 1(c)(i)

From the stopwatches displayed in Figure 1 on page 7, record the times taken for the blue-black colour to appear in the appropriate spaces in Table 1. The time taken for Experiment 1 has already been recorded for you.

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Other parts of this question

  1. 1(a)(i)Define the term 'rate of reaction'.[1 mark]
  2. 1(a)(ii)State TWO factors, other than concentration, which affect the rate of a chemical reaction.[2 marks]
  3. 1(b)(i)Calculate the concentration, in mol dm⁻³, of KIO₃ in Solution 1. [RAM: K = 39.1, I = 126.9, O = 16.0][3 marks]
  4. 1(b)(ii)The final concentration of NaHSO₃ in all experiments was 0.0008 mol dm⁻³. Using the information provided in Table 1 on page 6, determine the concentration of…[2 marks]
  5. 1(c)(ii)Calculate the reciprocal times (1/time) and record them to 3 decimal places in the appropriate spaces in Table 1. One of the times has already been recorded…[3 marks]
  6. 1(c)(iii)Using the axes provided on page 8, plot a graph of concentration of KIO₃ versus reciprocal time for Experiments 1-5, and draw the best straight line through…[5 marks]
  7. 1(d)Based on the graph drawn in (c) (iii) on page 8, what deduction can be made about the effect of concentration of aqueous KIO₃ on the rate of reaction?[2 marks]
  8. 1(e)Experiment 6 was carried out using Solution X, which contained an unknown concentration of KIO₃. Using the reciprocal time calculated in Experiment 6,…[2 marks]
  9. 1(f)(i)State the responding variable.[1 mark]
  10. 1(f)(ii)State the controlled variable.[1 mark]

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