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Question
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Solution
- Wood cannot be joined again to form the original piece, but its properties do not change.
- This is a physical change. Wood cannot be restored to its original form after burning.
- Its properties also change, and heat is produced. This is a chemical change. Here, there are two different states of burning the wood and cutting it into small pieces.
- In this situation, two different types of changes are considered.
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Physical changes are reversible.
