Name the cause of change which takes place during the :

Name the cause of change which takes place during the :

1. Conversion of ice into water
2. Conversion of water into hydrogen and oxygen
3. Formation of image of a person on a photographic film
4. Bending of iron rods to make an iron grille.

Answer:

a. When ice is converted into water, heat is absorbed by ice.

b. Water splits into hydrogen and oxygen due to an electric current being passed through the wate r .

c. Photographic film captures the image formed by light reflecting from the surface being photographed.

d. Forcing the Iron rods to make an iron grille