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1 markRates of Reaction

CSEC Chemistry · January 2020 · Paper 2 · Question 1(a)

Andrew conducted two experiments to investigate the rate of reaction between magnesium and dilute sulfuric acid. Experiment 1 involved adding magnesium strips to 50 cm³ of 2 mol dm⁻³ sulfuric acid in a 250 cm³ conical flask, measuring the volume of gas produced over six minutes. Figure 1 shows some gas syringe measurements, and Table 1 on page 6 summarizes the data.

Define the term 'rate of reaction'.

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Other parts of this question

  1. 1(b)(i)From the gas syringes displayed in Figure 1 on page 5, record the volume of gas produced in the appropriate spaces in Table 1. The volume at times 0, 5 and 6…[5 marks]
  2. 1(b)(ii)Use the data in Table 1 to plot a graph of the volume of gas produced against time, using the axes below.[5 marks]
  3. 1(b)(iii)From your graph, determine the time taken for the reaction to be completed.[1 mark]
  4. 1(b)(iv)During which time interval was the rate of reaction fastest?[1 mark]
  5. 1(b)(v)Explain your answer in (b) (iv).[3 marks]
  6. 1(b)(vi)From your graph, determine the volume of gas produced at 2.5 minutes.[1 mark]
  7. 1(b)(vii)Use your answer in (b) (vi) to determine the number of moles of gas produced at 2.5 minutes. [one mole of gas occupies 22.4 dm³ at standard temperature and…[3 marks]
  8. 1(b)(viii)Andrew wanted to identify the gas produced. He placed a lighted splint in a sample of the gas, which extinguished with a 'squeaky pop'. Deduce the identity of…[1 mark]
  9. 1(c)(i)Andrew's second experiment required the use of the same mass of magnesium but in the powdered form instead of strips. State the factor that Andrew is now…[1 mark]
  10. 1(c)(ii)Write a balanced chemical equation with state symbols for the reaction that occurred between magnesium and sulfuric acid in the experiments.[2 marks]
  11. 1(c)(iii)State ONE factor, other than the factor investigated by Andrew, which can affect the rate of a reaction.[1 mark]

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