Question

1. wet clothes are put on a washing line to dry. the water in the clothes turns into water vapour in the air as the clothes dry.

a) name the change as water turns into water vapour.........................
b) rain forms from water vapour in the air. name this change...................
c) the clothes dry much faster on a sunny day, explain why in terms of particles.
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Explanation:

a) When water turns into water vapour, it is a physical change called evaporation. Evaporation is the process by which a liquid (in this case, water) changes into a gas (water vapour).
b) When water vapour in the air forms rain, it is a physical change called condensation. Condensation is the process by which a gas (water vapour) changes into a liquid (rain).
c) On a sunny day, the temperature is higher. According to the kinetic - molecular theory, when the temperature is higher, the water particles in the clothes have more kinetic energy. They move faster and are more likely to escape from the surface of the clothes into the air as water vapour. So the rate of evaporation is higher, and the clothes dry faster.

Answer:

a) Evaporation
b) Condensation
c) On a sunny day, the temperature is higher. Water particles in the clothes have more kinetic energy, move faster, and escape more easily as water vapour. So clothes dry faster.