Answers: Exercise 1_2A Enthalpy 1. C 2. B 3. D 4. B 5. D 6. D 7. D 8. A 9. B 10. B 11. a) Line showing position of EA. 12. B 13. a) i) Activation energy = 70kj mol-1 Enthalpy change = +40 kj mol-1 ii) Activation energy = 30kj mol-1 Enthalpy change = -40 kj mol-1 b) Activation energy would be reduced by use of a catalyst. 14. 15.
