| 1. | D |
| 2. | D |
| 3. | B |
| 4. | A |
| 5. | B |
| 6. | B |
| 7. | D |
| 8. | B |
| 9. | B |
| 10. | A |
| 11. | |
| a) | B |
| b) | A,D |
| 12. | |
| a) | 1.36 cm3s-1 |
| b) | use a smaller hole to extend time to escape. Use larger volume of gas/ syringe |
| 13. | |
| a) | pink/purple to colourless [both parts needed] |
| b) | rate = 0.012s-1; time = 1/0.012 = 83.3s |
| c) | the time taken for the colour change would be too long for an accurate and consistent end point to be established. |
| 14. | |
 |
|
| 15. | |
| a) Endothermic | |
| b) 53.8ºC |
