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1 markMole Concept

CSEC Chemistry · January 2012 · Paper 2 · Question 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.]

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  1. 2(a)Assuming that the limestone granules are pure calcium carbonate, write a balanced equation for its reaction with hydrochloric acid.[2 marks]
  2. 2(b)(i)Use the data from Figure 3 to determine the total volume of gas produced.[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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