Question

3 differences between physical and chemical change for class 7​

Answer 1

Answer:

chemical changes

1. A new substance is formed
2. a substance loses its properties while undergoing a chemical change
3. example burning of wood

physical changes

1. no new substance is formed
2. a substance retains its properties while undergoing a physical change
3. example chopping wood

hope it helps:-)

Answer 2

Answer:

Physical change -- (1) It is reversible. (2) Energy is not involved and if involved then in small amount.. (3) Example Melting of ice...

Chemical change -- (1) It is irreversible. (2) Energy is involved during change (3) Example - Burning of fuel