3rd Grade ICSE

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08. Some Properties Of Water

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Last edited 37 days ago by Learn LoopHQ.

Chapter: 08. Some Properties Of Water

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Question 1

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Questions

What two forms of water are shown in the picture?

What process is happening to the ice cubes in the glass?

If this glass were placed in a very cold freezer, what process would occur to the liquid water?

Answers

The two forms of water shown are solid, represented by the ice cubes, and liquid, which is the water in the glass.

The process happening to the ice cubes is melting, which is the change of solid ice into liquid water due to the absorption of heat from the surrounding environment.

If this glass were placed in a very cold freezer, the liquid water would undergo solidification or freezing, where it would change from its liquid state back into solid ice due to the removal of heat.

Question 2

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Questions

Name the process by which water is turning into steam from the kettle.

What form of water is the steam?

What process is causing the water droplets to form on the underside of the cool plate?

Answers

The process by which water is turning into steam from the kettle is evaporation, where liquid water absorbs enough heat to transform into a gaseous state.

The steam visible is water in its gaseous form, commonly referred to as water vapour.

The process causing the water droplets to form on the underside of the cool plate is condensation, which occurs when the hot water vapour comes into contact with the cooler surface of the plate, loses heat, and changes back into liquid water.

Question 3

A clear glass of water with sugar granules

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Questions

In this picture, what substance acts as the solute and what acts as the solvent?

What is the resulting mixture in the glass called after the sugar fully disappears?

Suggest one way to make the sugar dissolve faster, based on what you’ve learned.

Answers

In this picture, the sugar granules act as the solute because they are the substance that is being dissolved, while the water acts as the solvent because it is the substance that dissolves the sugar.

The resulting mixture in the glass, once the sugar has completely dissolved and is no longer visible, is called a solution.

One effective way to make the sugar dissolve faster is to heat the water (the solvent), as warmer temperatures typically increase the rate at which solids dissolve in liquids.

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Question 4

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Questions

Identify which object is floating and which object is sinking in the water.

Explain why the plastic duck floats.

Explain why the metal key sinks.

Answers

In the picture, the yellow plastic duck is floating on the surface of the water, while the heavy metal key is sinking and resting at the bottom of the tank.

The plastic duck floats because, according to Archimedes’ principle, it displaces a volume of water that weighs more than the duck itself. This means the duck is less dense than the water it displaces.

The metal key sinks because it displaces a volume of water that weighs less than the key itself. This indicates that the key is denser than the water it displaces, causing it to move downwards to the bottom.

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