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5 marksPrinciples of Chemical Equilibrium

CAPE Chemistry Unit 1 · 2005 · Paper 2 · Question 4(a)

A chemical reaction achieves dynamic equilibrium as illustrated in Figure 2.

Describe the characteristic features of a dynamic equilibrium system, and explain which features are demonstrated in Figure 2.

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Other parts of this question

  1. 4(b)(i)Explain what is meant by the equilibrium terms Kc, Ka, and Kp.[3 marks]
  2. 4(b)(ii)Write the equilibrium constant expression Kc for the esterification reaction: C2H5OH(l) + CH3COOH(l) <=> CH3COOC2H5(l) + H2O(l).[2 marks]
  3. 4(b)(iii)Complete the missing initial and equilibrium concentration values in Table 3 for the esterification system.[5 marks]
  4. 4(b)(iv)Calculate the value of Kc using the concentrations from Table 3.[2 marks]
  5. 4(c)(i)Write the equilibrium constant expression for the reaction: 2SO2(g) + O2(g) <=> 2SO3(g).[1 mark]
  6. 4(c)(ii)Explain what a very small equilibrium constant indicates about the reaction mixture, and suggest how industrial sulfuric acid production remains commercially…[2 marks]

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