| 1. | |
| powders in place of lump/ increase concentration/ increase temperature | |
| 2. | |
| temperature | |
| 3. | |
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| 4. | |
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| 5. | |
| a) | |
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| b) | C5H12O |
| c) | i) Pb |
| ii) As distance from road increases, lead in soil decreases/ As soil depth increases lead content decreases. |
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