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3 marksRates of Reaction

CSEC Chemistry · January 2006 · Paper 2 · Question 3(a)(i)

Lauri investigates how the mass of manganese (IV) oxide catalyst affects the rate of oxygen production during hydrogen peroxide (H₂O₂) decomposition. Water and heat are also produced.

Name THREE factors OTHER THAN a catalyst, which can affect the rate of a chemical reaction.

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  1. 3(a)(ii)Write a balanced equation to show the decomposition of hydrogen peroxide by manganese (IV) oxide, MnO₂.[2 marks]
  2. 3(b)(i)Explain why the plots in Figure 4 are different.[2 marks]
  3. 3(b)(ii)a)For 0.80 mol dm⁻³ H₂O₂ and 4.0 g of catalyst, determine the quantity of O₂ produced in 16 seconds.[5 marks]
  4. 3(b)(ii)b)For 0.80 mol dm⁻³ H₂O₂ and 4.0 g of catalyst, determine the number of moles of O₂ produced in 16 seconds. [Atomic mass: O = 16][5 marks]
  5. 3(b)(ii)c)For 0.80 mol dm⁻³ H₂O₂ and 4.0 g of catalyst, determine the volume of O₂ produced at S.T.P. in 16 seconds. [1 mole of gas occupies 22.4 dm³ at S.T.P.][5 marks]
  6. 3(c)Draw a fully labelled energy profile diagram to illustrate how the catalyst affects the rate of decomposition of hydrogen peroxide.[3 marks]

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