Which of the following are physical changes?
Which of the following are physical changes and which are chemical changes?
(a) Burning of a magnesium wire
(b) Freezing of water
(c) Rusting of iron
(d) Glowing of an electric bulb
Classify the following changes as physical or chemical changes
Evaporation of alcohol
Expansion of air
Chewing food
Dissolving salt in water
Cooling a mixture of air and kerosene vapour
Burning a mixture of air and kerosene vapour
Pulling copper into thin wire
Tarnishing of jewellery
Which of the following is not a physical property of water?