What kind of change is shown by tearing of paper?

Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.

What kind of change is shown by tearing of paper?

Which of the following is a physical change?

State whether the following statements are true or false:

(a) When a candle burns, both physical and chemical changes take place.

(b) Anaerobic bacteria digest animal waste and produce biogas.

(c) Ships suffer a lot of damage though they are painted.

(d) Stretching of rubber band is not a physical change.

Explain why burning of wood and cutting it into small pieces are considered as two different changes.

Classify the changes involved in the following processes as physical or chemical changes:

a) Photosynthesis

b) Dissolving sugar in water

c) Burning of coal

d) Melting of wax

e) Beating aluminum to make aluminum foil

f) Digestion of food