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JAMB Chemistry 1984 Question 16

Question 16

Energy Changes

The diagram above (Fig. 3) shows the energy profile for the reaction A + B = C + D. From this diagram, it is clear that the reaction is

Diagram for this question
  1. A.spontaneous
  2. B.isothermal
  3. C.adiabatic
  4. D.exothermic
  5. E.endothermic
Show the answer and explanation

Answer: D (exothermic)

Explanation

The products end at a lower energy (about 42 kJ) than the reactants (about 60 kJ). Energy is given out, so the reaction is exothermic.