Question

7. Explain why burning of wood and cutting it into small pieces
considered as two different types of changes.
Describe how crystals of conner unhata
2​

Answer 1

The burning of wood leads to the formation of new substances like ash(carbon), carbon dioxide gas, water vapour, heat and light. This change is irreversible and hence a chemical change.While cutting wood into smaller pieces is a physical change as there is no change in the original composition of wood. Also, no new substances are formed.

Answer 2

Answer:

1. burning of wood is a chemical. change where a new substance is formed however cutting of wood is a physical change
2. crystal or crystalline solids whose constituent such as atom molecules or ions are arranged in a highly ordered microscopic structure forming a crystal lattice that extend in all directions.