Question

what is physical and chemical change?​

Answer 1

Difference between Physical & Chemical change.

Pʜʏsɪᴄᴀʟ ᴄʜᴀɴɢᴇ:

[1] Change is temporary.

[2] No new product is formed.

[3] It only effect physical properties.

[4] Ex: Burning of wax.

Cʜᴇᴍɪᴄᴀʟ ᴄʜᴀɴɢᴇ:

[1] Change is permanent.

[2] New product is formed.

[3] It effect both physical & chemical properties.

[4] Ex: Melting of wax.

Answer 2

A physical change is a change in which no new substance is formed or obtained after the reaction. The composition of the substance only changes physically not chemically. These can be easily reverted. They include changes like change in shape, luster, etc. whereas,

A chemical change is the one in which a new substance is obtained after the reaction. The composition of the substance changes chemically. These changes are usually irreversible. They include changes like change in temperature, color, etc.