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4 marksRates of Reaction

CAPE Chemistry Unit 1 · 2008 · Paper 2 · Question 2(a)

This section covers kinetics and equilibria. The reaction between butyl chloride (C₄H₉Cl) and water is investigated to determine the effect of concentration on reaction rates. A 0.100 mol dm⁻³ aqueous solution of butyl chloride is reacted with water, and its concentration is measured at various time intervals, as shown in Table 2.

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.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 2(b)Using your graph, estimate the concentration of butyl chloride at t = 400 s.[1 mark]
  2. 2(c)(i)Using suitable well-labelled diagrams, explain how EACH of the following affects reaction rates: Catalysts[4 marks]
  3. 2(c)(ii)Using suitable well-labelled diagrams, explain how EACH of the following affects reaction rates: Temperature[4 marks]
  4. 2(d)Name TWO industrial processes in which catalysts are used.[2 marks]

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