Question

What do you observe when :
a) water is boiled
b) a piece of paper is burnt
c) some ice cubes are kept in a glass tumbler
d) solid ammonium is heated
e) an iron nail is kept in tap water for a few minutes

Answer 1

Answer:

answer b) a piece of paper is burnt

Answer 2

Answer:

a) When water is boiled the solubility decreases when the temperature is raised, and the dissolved air bubbles go out from the water.

And the process of turning from liquid into vapour is known as evaporation.

b) When a piece of paper is burned then it turns into ashes.This process is chemical change.

c) when ice cubes are kept in a glass tumbler after few seconds it turns into liquid. This process is called physical change .

d)