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2 marksMole Concept

CSEC Chemistry · January 2012 · Paper 2 · Question 2(a)

An experiment was carried out at 25 °C by dissolving an unknown mass of limestone granules into excess 1 mol dm⁻³ hydrochloric acid. The volume of gas produced over a period of 6 minutes was measured using a gas syringe. The result was plotted as shown in Figure 3.

Assuming that the limestone granules are pure calcium carbonate, write a balanced equation for its reaction with hydrochloric acid.

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Other parts of this question

  1. 2(b)(i)Use the data from Figure 3 to determine the total volume of gas produced.[1 mark]
  2. 2(b)(ii)to calculate the moles of gas produced at STP [1 mole of any gas at STP has a volume of 22 400 cm³.][1 mark]
  3. 2(b)(iii)to calculate the mass of limestone granules used. [Relative molecular mass of CaCO₃ is 100.][2 marks]
  4. 2(c)(i)What is meant by the term 'rate of reaction'?[1 mark]
  5. 2(c)(ii)Besides temperature, identify TWO other factors that can affect the rate of the reaction.[2 marks]
  6. 2(c)(iii)a)If the temperature at which the reaction was carried out was changed from 25 °C to 40 °C, would the rate of reaction increase or decrease?[1 mark]
  7. 2(c)(iii)b)Explain your answer.[2 marks]
  8. 2(d)(i)Is it LIKELY that calcium carbonate will conduct electricity in its solid state?[1 mark]
  9. 2(d)(ii)Give a reason for your answer.[2 marks]

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