2. More about Water

Question 1

Water does not have any ____________, ____________ and ___________

Answer 1

1. smell
2. taste
3. colour

Question 2

What states does water exist?

Answer 2

1. Liquid (water)
2. Solid (ice)
3. gas (water vapour)

Question 3

States of Water

___________ and ____________ can take different shapes and they can flow.

Answer 3

1. Water
2. Water Vapour

Question 4

States of Water

___________ has a fixed shape and it cannot flow.

Answer 4

Ice

Question 5

States of Water

Water and water vapour can take ______________ and they can_______________

Answer 5

different shapes
flow

Question 6

States of Water

Ice has a ____________ and it ________ flow

Answer 6

fixed shape
cannot

Question 7

Describe the changes of the state of water

Answer 7

1. When ice is heated, it melts and turns in to water.
2. When water is heated, it evaporates and turns into water vapour.
3. When water vapour is cooled, it condenses and turns into water.
4. When water is cooled, it freezes and turns into ice.

Question 8

We can observe how water changes from one state to another in our daily lives. For example, if we hang we clothes in the open air,

Answer 8

the water evaporates and the clothes gradually become dry.

Question 9

The rate of evaporation is affected by

Answer 9

1. airflow
2. temperature
3. size of the exposed surface area of an object

Question 10

Rate of evaporation

Water evaporates faster from an object if

Answer 10

1. The airflow is good
2. The temperature is high
3. The exposed surface are is large

Question 11

Water constantly changes from one state to another in the ____________

Answer 11

water cycle

Question 12

Water can appear in different forms such as

Answer 12

1. cloud
2. rain
3. fog (霧)
4. dew (露)
5. snow
6. frost (霜)

Question 13

Describe the water cycle

Answer 13

1. The sun heats up water on the land and in the sea.
2. Some water evaporates and turns into water vapour, which rises into the air
3. Water vapour cools and condenses into water droplets. They groups together and become clouds.
4. When the water droplets become too heavy, they fall on land and into the sea as rain.

Question 14

Describe the formation of fog

Answer 14

If warm and humid air is cooled down in the lower sky, the water vapour may condense into tiny water droplets, which float in the air.

Question 15

Describe the formation of dew

Answer 15

Water vapour condenses into water droplets on a cooler surface