| 1. | B | |
| 2. | D | |
| 3. | A | |
| 4. | B | |
| 5. | B | |
| 6. | D | |
| 7. | C | |
| 8. | C | |
| 9. | A | |
| 10. | B | |
| 11. | |
 |
|
| 12. | |
 |
|
| 13. | |
| B | |
| 14. | |
 |
|
| 15. | |
 |
|
| 16. | |
| Mean bond enthalpy is the average enthalpy change when one mole of bonds are broken. | |
| 17. | |
| a) | |
| i) | Hydration |
| ii) | -45 kj mol-1 |
| 18. | |
| -8 kj mol-1 | |
| 19. | |
| b) | |
| i) | Enthalpy of formation. |
| ii) | |
| 20. | |
| a) | |
| b) | |
| c) | |
