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3 marksMole Concept

CSEC Chemistry · January 2009 · Paper 2 · Question 1(a)(iii)

Students are conducting an experiment to determine how hydrochloric acid concentration affects its reaction rate with magnesium. They have magnesium ribbon, 1.5 mol dm⁻³ HCl, deionized water, and lab equipment. They will perform four experiments using 50 cm³ of acid each time.

Calculate the mass of magnesium that will COMPLETELY react with 50 cm³ of 1.5 mol dm⁻³ HCl. (Relative atomic mass of Mg = 24; H = 1; Cl = 35.5)

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Other parts of this question

  1. 1(a)(i)Explain the effect of increasing the concentration of the reactants on the rate of a chemical reaction.[2 marks]
  2. 1(a)(ii)Write a balanced equation for the reaction between magnesium and hydrochloric acid.[2 marks]
  3. 1(a)(iv)Describe how you would prepare 50 cm³ of different concentrations of hydrochloric acid from the solution of 1.5 mol dm⁻³ hydrochloric acid provided.[3 marks]
  4. 1(a)(v)Figure 1 shows a series of diagrams that represents how the students set up the experiment to determine the effect of the concentration of acid on the rate of…[3 marks]
  5. 1(b)(i)Plot the TOTAL volume of oxygen given off against time, on the graph paper on page 7.[3 marks]
  6. 1(b)(ii)Account for the shape of the graph obtained.[2 marks]
  7. 1(b)(iii)From your graph determine the volume of oxygen gas produced after 50 seconds.[1 mark]
  8. 1(c)A number of tests were carried out on an aqueous solution of Compound R. The observations obtained are recorded in Table 2. Write suitable inferences and ionic…[6 marks]

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