Explain why burning of wood and cutting it into small piece are considered as two different types of changes.

Answer in Brief

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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Chapter 5 Physical and Chemical Changes
Exercises | Q 7. | Page 55

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