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JAMB Chemistry 2010 Question 27

Question 27

Energy Changes

If a reaction is exothermic and there is a great disorder, it means that

  1. A.the reaction is static
  2. B.the reaction is in a state of equilibrium
  3. C.there will be a large increase in free energy
  4. D.there will be a large decrease in free energy
Show the answer and explanation

Answer: D (there will be a large decrease in free energy)

Explanation

ΔG = ΔH − TΔS. A negative ΔH and a large positive ΔS both make ΔG strongly negative, a large decrease in free energy.