Question

define physical and chemical change with examples

Answer 1

the change which can be reverted easily is physical change... e.g. making raw roti from pasted wheat


the change which involve the transformation of the chemical characteristics of a thing is called chemical change.. they are permanent and cannot be reverted
...e.g... making fried roti of the raw


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Answer 2

Physical change -

• In physical change, we can get back the original substance.

• No new substance is formed.

• Examples -

1. tearing of paper
2. kicking of football
3. freezing of water
4. glowing if bulb
5. melting of ice

Chemical change -

• In chemical change, it is difficult to get the original substance back.
• New substance with new different properties if formed.
• Examples -

1. respiration in living beings
2. cooking of food
3. burning of paper
4. fermentation of sugarcane juice
5. burning of wood