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Chapter 2 Energy and Matter

2.5 States of Matter

Copyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings

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Solids

Solids have • a definite shape.• a definite volume. • particles that are close

together in a fixed arrangement.

• particles that move very slowly.

Copyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings

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Liquids

Liquids have• an indefinite shape, but

a definite volume.• the same shape as their

container. • particles that are close

together, but mobile.• particles that move

slowly.

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Gases

Gases have • an indefinite shape. • an indefinite volume.• the same shape and

volume as their container.

• particles that are far apart.

• particles that move very fast.

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Three States of Matter for Water

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Summary of the States of Matter

Solid Liquid Gas

Copyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings

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Identify each as: 1) solid 2) liquid or 3) gas.

___ A. It has a definite volume, but takes the shape of

the container.

__ B. Its particles are moving rapidly.

__ C. It fills the volume of a container.

__ D. It has particles in a fixed arrangement.

__ E. It has particles close together that are mobile.

Learning Check

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Identify each as: 1) solid 2) liquid or 3) gas.

2 A. It has a definite volume, but takes the shape of the container.3 B. Its particles are moving rapidly.

3 C. It fills the volume of a container.

1 D. It has particles in a fixed arrangement.

2 E. It has particles close together that are mobile.

Solution