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2 marksMole Concept

CSEC Chemistry · May/June 2018 · Paper 2 · Question 1(b)(i)

Write a balanced chemical equation for the reaction between calcium carbonate and hydrochloric acid.

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  1. 1(a)Define 'rate of reaction'.[1 mark]
  2. 1(b)(ii)Calculate the volume of carbon dioxide that would be produced at RTP from 1.0 g of CaCO₃ chips. [RMM: CaCO₃ = 100; 1 mole of a gas occupies 24 000 cm³ at RTP.][3 marks]
  3. 1(c)(i)From the stopwatches displayed in Figure 1 on page 4, record the times taken for the carbon dioxide gas to be collected in the appropriate spaces in Table 1.…[3 marks]
  4. 1(c)(ii)Calculate the reciprocal times (1/time) and record them to 3 decimal places in the appropriate spaces in Table 1. The reciprocal time for Test 1 has already…[4 marks]
  5. 1(c)(iii)Using the axes provided in Figure 2 on page 7, plot a graph of reciprocal time versus temperature for Tests 1–6. Draw the best curve through the points.[5 marks]
  6. 1(d)(i)Based on the graph drawn in (c)(iii) on page 7, deduce the effect that temperature has on the rate of reaction.[1 mark]
  7. 1(d)(ii)State TWO reasons that account for the observed effect, given in (d)(i), of temperature on the rate of reaction.[2 marks]
  8. 1(e)Use the graph drawn on page 7 to determine the value of the reciprocal time that would have been obtained if the experiment was carried out at 40 °C.[2 marks]
  9. 1(f)Describe a confirmatory test for carbon dioxide.[2 marks]

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