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Explain Why Burning of Wood and Cutting It into Small Piece Are Considered as Two Different Types of Changes. - CBSE Class 7 - Science

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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 1

When we burn wood, a new substance, coal, is formed. Therefore, it is a chemical change. However, when we cut wood, only the shape and size of the wood are changed. No new substance is formed. Therefore, it is a physical change.

Solution 2

Burning of wood is a chemical change because in burning new substances are formed as

Wood + Oxygen ———–> Charcoal + Carbon dioxide + Heat + Light

But cutting it into small pieces is physical change because no new substance is formed. We can only reduce the size of wood

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Science Textbook for Class 7 (2018 to Current)
Chapter 6: Physical and Chemical Changes
Q: 7 | Page no. 66
Solution Explain Why Burning of Wood and Cutting It into Small Piece Are Considered as Two Different Types of Changes. Concept: Concept of Physical Changes.
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