Topic: Science Primary 4 - Water

• List of sub-topics– States of water– Changes of states– Freezing and

Melting– Boiling– Evaporation– Condensation

• Games• Assessments &

Activities

LEARNING PANELORGANIZE

THINK

EXPLORE

APPLY

ATER

images

Organize*Click on the following link to open*

. States of water. Changes in the states of water

. Freezing and Melting. Boiling

. Evaporation. Condensation

ThinkClick on the links below to read your instructions before proceeding to the next task.

• states of water

• changes in the states of water

• freezing and melting

• boiling

• evaporation

• condensation

ExploreLINKS TO ADDITIONAL READING MATERIALS

& ACTIVITIES

Science clip 1Science clip 2

Lets change the state of water!States of Water

SolidLiquidGas

Apply ASSESSMENT CORNER

*Click the following link to do your assessment*

Sheet 1

Sheet 2

- Part 1

- Part 2

• Water exists in states : – Liquid– Solid– Gaseous or Gas

• ExampleS :Solid – Ice or SnowLiquid – WaterGas – Water vapour / Steam

• The water that comes out of our taps is a liquid.

• Hence it is called water in a liquid state.

• If we put water in a freezer, it changes to ice.

• Ice is a solid, therefore it is water in a solid state.

• If we boil water for a long time, it disappears.

• It changes to steam or water vapour.• Steam or water vapour is a gas, thus

it is water in the gaseous state.• On whole, water exists in 3 different

states namely liquid state, solid state and gaseous state.

1. Can you see steam?2. Water has many uses. Give some

examples.

Review Questions…. What is the three states of water?What is the other name for steam?

CHANGES IN THE STATES OF WATER

CHANGES IN STATES OF WATER

• Water can exist in any of the 3 states depending on its temperature.

• Water gains heat when heated.• Water loses heat when cooled.

Change water from one state to another.HEAT

1. What happened to the temperature when water gains and loses heat?

Review Question Water requires _______ energy to change its states.

Freezing

REEZING

• When water becomes cold, it loses heat.– Its temperature falls.

• At 0°C, water changes to ice.– Changes : Liquid state to Solid state

• Hence, the changes from liquid to solid is called FREEZING.

• The temperature of 0°c is called the freezing point of water.

1. What are the uses of ice?

Review QuestionsWhat happens to water when we put it in the freezer?What is the temperature 0°c implies to?

MELTING

MELTING• Changes of water from solid to

liquid is called melting.• Ice melts at 0°c. The temperature

where ice melts is called the melting point.

• Ice can change into water.• Water can also change into ice.

1. What is a cycle?2. Some water changes to ice. The ice then melts and change to water. This is a ‘water

cycle’. Why?

Review QuestionWhat happens to ice when it gets warm?

BoilingBoiling

• Another state of water is boiling.• Boiling is the process whereby water

changes to steam.• When we heat water, it becomes hot

and start to boil at the temperature of 100°C.

• This is the boiling point of water.• Boiling = Water Steam

BoilingBoiling

1.What happened when we boil water?

Review QuestionsWhat is the temperature of boiling water?What is steam?

VAPORATIO

• Water does not have to boil to change into gas.

• This change can happen at any temperature.

What will happen if you

wash your clothes and

hang them up?

We cannot see water vapour. Water vapour is water in gaseous state.

The liquid water in your clothes

changes into a gas called WATER

VAPOUR.

We call this change from liquid to gas EVAPORATION.

Water Water Vapour

When all the liquid water in your clothes has evaporated, your clothes are dry.

EVAPORATION

1. Do you think evaporation happens when water boils?

2. Both steam and water vapour are gases. What is the difference?

Review QuestionsWhat is evaporation?What is water vapour?

What is condensatio

n?

There is a lot of water vapour in the air.We cannot see this water vapour.When water vapour touches something cold for example, a cold glass the water vapour changes into liquid water.This change of state is called CONDENSATION.

Water Vapour WaterCONDENSATION

Condensation also happens when water boils.When water boils it changes into steam. When steam touches cold air, we can see a cloud.This cloud is made up of tiny drops of water.The steam has condensed into water.

Steam Water

Water can change into steam and steam can also change back into water again.

CONDENSATION

1. Have you seen drops of water on a cold glass? Where does the water come from?2. If someone wear glasses, what will

happened if he/she move from a cold room into warm air? Why?

Review QuestionWhat happens in condensation?What are the changes of states taking place in condensation?

Boiling Water

Ice

Drinking Water

LIST OF IMAGES & ANIMATION

LAKE

RIVER

SEAS

RAINDROPS

STATES OF WATER

States of Water

•Click ‘ORGANIZE’, read the lesson notes on states of

water. •Answer the questions given.

•Discuss with teacher.

CHANGES IN THE STATES OF WATER

•Click ‘ORGANIZE’, read the lesson notes on THIS

TOPIC.•Answer the questions.•Discuss with teacher.

Freezing and Melting

• Click ‘ORGANIZE’, read the lesson notes on THIS TOPIC.

• Answer the questions.• Discuss with teacher.• Link the terms ice, water, melting

and freezing.• Infer that the air temperature must

be less than 0°c for freezing to takes place and the processes is reversible.

Boiling

•Click ‘ORGANIZE’, read the lesson notes on Boiling.•Answer the question.•Discuss with teacher.

Evaporation

•Click ‘ORGANIZE’, read the lesson notes on THIS

TOPIC.•Answer the questions.

•Discuss with the teacher.

Condensation

• Click ‘ORGANIZE’, read the lesson notes on Condensation.

• Answer the questions.• Discuss with teacher.• Relate the process of

condensation and Evaporation.