Chemistry-Grade 9

Do we always need to heat or change pressure for changing the state of matter?

• TRUE

• FALSE

Why does our palm feel cold when we put some acetone or perfume?

• Particles of liquid absorb energy

• It happens due to humidity

What affects the rate of evaporation?

• Humidity

• Wind

• Energy

• Temperature

If the amount of water in air is already high,the rate of evaporation

• increases

• decreases

• is the same

• neutral

Why do people sprinkle water on the ground in summer during evening?

• The water stays there and the place is still warm

• The water evaporates and the place is warm

• The water evaporates and the place gets cool

Phenomenon of change of a liquid into vapours at any temperature below its boiling point is called

• condensation

• precipation

• evaporation

• water cycle