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BECE Science 2024 Paper
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Question : 24
Total: 40
The following processes are chemical changes except
crumpling of paper.
burning of wood.
mixing of an acid and a base.
rusting of iron.
Validate
Solution:
For chemical change, new substances are formed and the process is mostly irreversible.
Only crumpling of paper is physical change since no substance is formed. Crumpled paper is still paper.
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