PS AR RSO P5L5 Water and Changes of State WS

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Topic: WATER AND CHANGES OF STATE (LESSON 5)

WATER AND CHANGES OF STATE (LESSON 5)

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Lesson Outline

• Notes
• Activity 1: Concept Recall
• Activity 2: Open-ended Questions
• Activity 3: Science in Daily Life

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WATER AND CHANGES OF STATE – NOTES Primary 5: Rocket Science
Animation
States of Water

Solid Liquid Gas

Temperature When we Water will When we The boiling point
of ice is increase the remain in increase the of water is at
surrounding liquid state temperature
. temperature from the till 100℃, .
The freezing ice will start temperature water will The rate of
and melting to ranging from start to evaporation is
temperature and this governed by 4
of ice is process is to . and factors:
reversible A special occurs. But
. i.e. if we property of when we 1)
When salt is decrease the water is that decrease the 2)
added to ice surrounding water will temperature 3)
it temperature contract the water 4)
the melting water will when cooled vapour will
point. start to to 4℃ but start to

. until 0℃ to become
water.

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Primary 5: Rocket Science OEQ

Activity 2 – Open-ended Questions
1. Leon gathered 4 identical containers A, B, C and D that was made from different

materials. He poured a different amount of water into each container and placed them
under the hot sun.

Container A Container B Container C Container D

The table below provides information about the containers used.

Container AB C D
2
Time placed in the sun (h) 1 2 1 80

Initial volume of water (ml) 80 100 80

(a) To find out how the material of the container affects the rate of evaporation [1]
of water, name two containers Leon should use for his experiment. Explain
your answer.

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Primary 5: Rocket Science OEQ

(b) Leon had two measuring cylinders (1000ml and 100ml) as shown below to
measure the amount of water left in the containers at the end of his
experiment.

ml

Cylinder P Cylinder Q

Which cylinder should Leon use to measure the amount of water left in the [1]
containers? Explain your answer.

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Primary 5: Rocket Science OEQ

2. Desalination is a process in which salt and other minerals are removed from sea water.
The diagram below shows a model of how desalination is carried out.

B

Stopper Tube

Cold, damp cloth

A Sea Beaker
water C
Test
tube

Heat

(a) In the table below, write down the process that is taking place at A and B. [1]

Processes
A
B

(b) Explain how the cold damp cloth that covers the tube helps the process of [1]
obtaining C in the beaker.

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Primary 5: Rocket Science OEQ

(c) The desalination process is carried out until there is no sea water left in the [1]
test tube. Identify the substances that are collected at the end of the
desalination process.

Substance left in the test tube
Liquid left in the beaker

(d) The statements A to F below describe the events that lead to the formation of [1]
rain. They are not in the correct order.

A: Water evaporates.
B: Condensation happens.
C: Warm air rises and then cools.
D: Droplets of water form clouds.
E: Heat energy from the sun warms the Earth.
F: When the water droplets become bigger, rain falls.

Complete the diagram below to show the correct order of events in rain
formation.

F

(e) Why is the water cycle important? [1]

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Primary 5: Rocket Science OEQ

3. Ahmad bought a glass of iced milo. After a while, he noticed there were water
droplets on the outside of the cup.

Water droplets [2]
(a) Explain how the water droplets were formed.

(b) Ahmad left the glass of milo on the table and then went for a nap. After two hours,
Ahmad came back and noticed that the water droplets had disappeared.

Explain why the water droplets had disappeared from the side of the cup. [2]

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Primary 5: Rocket Science OEQ

4. Raleigh made a “mini world” where plants grow in. The plants can live for many months
without adding water or removing the stopper for air to enter.

Stopper
Jar

Moist soil

(a) Explain why the plants can survive many months without adding water. [2]

(b) The stopper prevents air from entering the jar. Explain how the plants are [2]
able to remain alive without a continuous supply of fresh air.

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Primary 5: Rocket Science OEQ
Activity 3 – Science in Daily Life: How do dehumidifier granules work?

Discussion:

1. What are these granules for?
2. What are they made of?
3. How do they prevent mould growth or furniture damage?

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