| 1. | |
| a) | lump |
| b) | |
| flaked – less than 25s greater than 18s | |
| lump greater than 25s | |
| c) | less than 18s |
| 2. | |
| faster production of gas | |
| 3. | |
| New substance produced | |
| 4. | |
| A | Oxygen |
| B | Hydrogen |
| C | Carbon dioxide |
| 5. | |
 |
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