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1 markRates of Reaction

CSEC Chemistry · May/June 2013 · Paper 2 · Question 4(b)(i)

An experiment was carried out where an unknown mass of calcium carbonate chips was added to excess 2 mol dm⁻³ hydrochloric acid. The volume of CO₂ evolved was measured at specific times using a gas syringe. The results were plotted and produced the graph shown in Figure 4. The reaction equation is: CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + CO₂ (g) + H₂O (l).

Use the graph in Figure 4 to determine the total volume of CO₂ produced.

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Other parts of this question

  1. 4(a)State FOUR factors that can influence the rate of reaction.[4 marks]
  2. 4(b)(ii)Calculate the mass of CaCO₃ used in the experiment. [RAM: Ca = 40, C = 12, O = 16][2 marks]
  3. 4(b)(iii)One of the students suggested that powdered calcium carbonate should have been used instead of chips. State, with reason, how the time for completion of the…[2 marks]
  4. 4(c)(i)Explain why metals are often combined to make alloys.[2 marks]
  5. 4(c)(ii)Other than electrolysis, describe a suitable laboratory procedure that could be used to obtain a sample of dry copper from a sample of the alloy.[4 marks]

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