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2 marksUncertainty in Measurements

CAPE Chemistry Unit 2 · 2007 · Paper 2 · Question 1(b)(ii)

State TWO precautions that should be taken to ensure the experiment yields accurate results.

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  1. 1(a)(i)Write the chemical equation for the equilibrium reaction between bromine and chlorine forming BrCl.[1 mark]
  2. 1(a)(ii)Write the expression for the equilibrium constant, K_c.[2 marks]
  3. 1(b)(i)In an experiment to monitor the equilibrium, the mixture contains 0.0389 mol of Br2, 0.0111 mol of Cl2, and 0.0546 mol of BrCl. Given that K_c at 298 K is…[3 marks]
  4. 1(b)(iii)Suggest ONE safety measure that should be taken in this experiment.[1 mark]
  5. 1(c)Under what experimental condition would the value of K_c be greater than 6.90, given that the reaction is endothermic?[1 mark]

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