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3 marksMole Concept

CSEC Chemistry · May/June 2019 · Paper 2 · Question 1(e)(ii)

Calculate the total volume of hydrogen gas that would be produced at RTP from 0.55 g of zinc granules. [RAM: Zn = 65.4; 1 mole of a gas occupies 24 000 cm³ at RTP]

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  1. 1(a)(i)From the stopwatches displayed in Figure 1 on page 5, record the times for the hydrogen gas to be collected in Column 3 in Table 1. The time taken for…[3 marks]
  2. 1(a)(ii)Using the formula Rate = 1/Time, calculate the rate of reaction for each experiment and record these values to 3 decimal places in Column 4 of Table 1. The…[3 marks]
  3. 1(a)(iii)Using the grid provided on page 7, plot a graph of rate versus time for Experiments 1-6. Draw the best curve through the points.[5 marks]
  4. 1(b)(i)Based on the graph plotted on page 7, deduce how the rate of the reaction varied with time.[2 marks]
  5. 1(b)(ii)Explain how the trend in the rate of reaction stated in (b)(i) relates to the surface area of the zinc granules.[2 marks]
  6. 1(b)(iii)List THREE factors, other than surface area, that affect the rate of a reaction.[3 marks]
  7. 1(c)State ONE safety precaution that Michael and Jennifer may have taken during the experiments.[1 mark]
  8. 1(d)Suggest ONE way in which Michael and Jennifer may have controlled the temperature during the experiments.[1 mark]
  9. 1(e)(i)Write a balanced chemical equation, including state symbols, for the reaction between zinc metal and sulfuric acid.[2 marks]

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