Question

Comparison between physical and chemical changes. 5 points for class 7

Answer 1

PC-Temporary change
they are reversible reactions
new products are not formed
now intermidate is required for reaction to occur
clour nd state changes
CC-permenanat change
irreversible reaction
new products are formed

Answer 2

Physical change : 
1. Temporary
2. Reversible 
3. No new substances are formed; no change in compostion
4. No change in mass
5. Generally accompained by marked evoultion or absorption of heat.

Chemical change
1. Permanaet
2. Irreversible
3. New substances are formed; change in composition
4. Change in mass
5. Always accompained by the evolution or absorption of heat and sometimes emanation of light also.

Hope it helps