3rd Grade ICSE

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07. Forms Of Matter Solids, Liquids And Gases

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Last edited 37 days ago by Learn LoopHQ.

Chapter: 07. Forms Of Matter Solids, Liquids And Gases

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Question 1

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Questions

Identify the three forms of matter depicted in the picture.

For each identified form, briefly describe one key characteristic from the chapter.

How does this picture help us understand that water can exist in different forms?

Answers

The three forms of matter depicted are solid (ice), liquid (water), and gas (steam/water vapour).

Ice (solid) has a fixed shape and size. Water (liquid) takes the shape of its container and flows easily. Steam (gas) does not have a fixed shape or size and spreads out to fill the space.

This picture clearly shows water in its solid state as ice and ice floes, in its liquid state as the surrounding water, and in its gaseous state as steam rising from the boiling kettle. This visual representation vividly illustrates how the same substance, water, can exist in all three forms of matter.

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Question 2

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Questions

What form of matter are all these objects?

Based on the chapter, what are two main characteristics that classify these as this form of matter?

If you tried to pour any of these objects into a different shaped container, what would happen?

Answers

All these objects – the wooden chair, the stack of books, and the ice cubes – are examples of solids.

Two main characteristics that classify them as solids are that they have a fixed shape and a fixed size. They also cannot flow.

If you tried to pour any of these objects into a different shaped container, they would not flow or change their individual shapes to fit the new container. For example, a chair would remain a chair, and ice cubes would remain cubes, even if the container could hold them.

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Question 3

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Questions

What form of matter is being poured in this picture?

Observe the water in the different glasses. What can you say about its shape?

What does this observation tell us about the property of liquids regarding their shape?

Answers

The form of matter being poured in this picture is a liquid, specifically water.

When the water is poured into the tall glass, it takes on a tall, slender shape. In the short, wide glass, it becomes short and wide. In the spherical glass, it adapts to the round shape. The water itself does not have a fixed shape, but its volume remains constant.

This observation clearly tells us that liquids do not have a fixed shape of their own; instead, they take the exact shape of the container they are placed in. However, they do occupy a fixed amount of space.

Question 4

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Questions

What is inside the inflated balloon that makes it big and sometimes buoyant?

Can you clearly see what fills the inflated balloon? What does this suggest about the nature of this matter?

If you let the substance out of the balloon, what will happen to the space it occupies?

Answers

Inside the inflated balloon is air, which is a mixture of gases. It is the volume of this air that makes the balloon appear big and, if filled with a lighter gas like helium, buoyant.

No, we cannot clearly see what fills the inflated balloon. This suggests that most gases, like air, are invisible and cannot be seen with the naked eye.

If you let the air out of the balloon, the gas will quickly spread out to fill the entire surrounding space, becoming undetectable in the vastness of the room. It will no longer be confined to the small, fixed space within the balloon.

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