water - evaporation 1

Define evaporation.

• A process which liquid changes to gas in a range of temperature.

• A process which liquid changes to gas at a fixed temperature.

• A process which water changes to water vapour in a range of temperature.

• A process which water changes to water vapour at a fixed temperature.

Which of the following is not a difference between evaporation and boiling?

• Bubbles are seen during boiling but not during evaporation.

• Evaporation happens at the surface of the liquid but boiling happens throughout the liquid.

• Liquid changes to gas during evaporation but not during boiling.

• Boiling is a fast process but evaporation is a slow process.

Which of the following statements is true when a pot of water is boiling?

• Evaporation is known as boiling when water is at 100^oC.

• Evaporation also happens during boiling.

• Bubbles are produced at the surface of the water.

• When bubbles are seen, the temperature of water must be above 100^oC.

Four glasses, P, Q, R and S, contain equal amount of water.

Heating lamps are placed on top of the four glasses as shown.

Which glass will have the least amount of water after some time?

• glass P

• glass Q

• glass R

• glass S

Four containers, A, B, C and D, contain equal amount of water.
Fans are blowing at the same speed on top of the containers as shown.
Which container will have the most amount of water left after some time?

• container A

• container B

• container C

• container D

Four different containers, A, B, C and D, contain equal amount of water.

Which container will be the last to dry up?

• container A

• container B

• container C

• container D

Four containers, A, B, C and D, contain equal amount of water.
Fans and heating lamps are turned on as shown.
Which container will have the most amount of water left after some time?

• container P

• container Q

• container R

• container S

How does blowing bubbles into the water increases the rate of evaporation?

• increases the expose surface area of water

• increases the temperature of the water

• decreases the expose surface area of water

• decreases the temperature of the water

Four sets of wet sponges are shown below.

Which set will dry up first?

• set A

• set B

• set C

• set D

Which of the following is a similarity between condensation and evaporation?

• both involve a state change from liquid to gas

• both happen at a range of temperature

• bubbles can be seen during both processes

• both processes require heat to be absorbed