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4 marksRates of Reaction

CSEC Chemistry · May/June 2012 · Paper 2 · Question 1(a)(iii)

A student investigates the effect of particle size on the rate of reaction between calcium carbonate and nitric acid. They weigh 1.8 g of powdered calcium carbonate and 1.8 g of large granules (marble chips), reacting each with excess dilute nitric acid. The volume of gas produced is measured at 10-second intervals for 100 seconds. Table 1 records the gas volume for both reactions. Figure 1 is an incomplete diagram of the apparatus, and Figure 2 shows the graph for powdered calcium carbonate.

With reference to the volume of gas produced and the slopes along the two curves on the graph, outline ONE similarity and ONE difference in the volume of carbon dioxide produced from powdered calcium carbonate and from marble chips. Include a reason in EACH case.

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Other parts of this question

  1. 1(a)(i)Complete Figure 1 to show how the gas was collected and measured during the experiment.[2 marks]
  2. 1(a)(ii)Using the same axes in Figure 2, plot a graph of the volume of gas produced versus time for the reaction with marble chips. Four of the points have already…[3 marks]
  3. 1(a)(iv)Write a balanced equation for the reaction between calcium carbonate and nitric acid.[2 marks]
  4. 1(a)(v)Calculate the volume of gas that can be obtained from reacting 1.8 g of calcium carbonate with dilute nitric acid at R.T.P. [1 mole of gas occupies 24 000 cm³…[3 marks]
  5. 1(a)(vi)From the graph, the total volume of gas produced is 370 cm³. Suggest a possible reason for the difference in your answer obtained in (v) on page 4 and the…[1 mark]
  6. 1(a)(vii)State TWO other factors (than the one given in (vi) above) that can affect the rate of reaction between nitric acid and calcium carbonate.[2 marks]
  7. 1(b)(i)Complete Table 2, row 1, inference (i).[8 marks]
  8. 1(b)(ii)Complete Table 2, row 2, observation (ii).[8 marks]
  9. 1(b)(iii)Complete Table 2, row 3, inference (iii).[8 marks]
  10. 1(b)(iv)Complete Table 2, row 4, inference (iv).[8 marks]
  11. 1(b)(v)Complete Table 2, row 4, observation (v).[8 marks]

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