How things can change

Students know the properties of substances can change when the substances are mixed, cooled, or heated... Things Can Change Things are solid, liquid, or gas.. Mixing can change some t

Standards Preview Standard Set 1 Physical Sciences

1 Materials come in different forms

(states), including solids, liquids, and

gases As a basis for understanding

this concept:

1.b. Students know the properties

of substances can change when the

substances are mixed, cooled, or

heated

Nonfi ction Put Things in Order • Captions

• Glossary

Matter

Scott Foresman Science 1.2

ISBN 0-328-23475-3

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How Things Can

Change

by Peggy Bresnick Kendler

Physical Sciences

dissolve

evaporate

freeze

melt

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How Things Can

Change

by Peggy Bresnick Kendler

Things Can

Change

Things are solid, liquid, or gas

Things can change

Mixing can change some things

Mix cocoa with milk for chocolate milk!

See what happens when cocoa

mixes with milk!

2

Milk is a liquid

We can freeze milk

To freeze is to change a liquid to a solid.

Frozen milk is a solid

3

Heating melts the frozen milk.

Melt means to change to a liquid.

Heating frozen milk makes it into a liquid

Popsicles can melt.

4

Making Ice Cream

Next, stir the liquid in the ice cream maker.

The liquid freezes into

a solid Yum!

First, pour liquid milk and cream into a bowl.

5

Properties Can

Change

Size, shape, and color can change

Rain makes puddles bigger

When you use crayons, they get smaller

Mixing changes some things

Mix red paint and yellow paint

You get orange paint!

6

Wood can be changed by fi re

Fire is very, very hot

Fire burns wood

Heating changes the wood

It turns it into ashes and smoke

Fire changes wood into ashes.

7

Mixing Changes

Things

Mix some salt with water

The salt is a solid

The salt can dissolve in water

To dissolve means to spread through

a liquid

8

Rocks are solid

Rocks do not dissolve in water

They stay solid

9

Heating and

Cooling Changes

Things

Water is a liquid

Water can freeze as it falls from clouds

The frozen water makes snowfl akes

Snowfl akes are solid

Snow is frozen water.

10

Heating changes snow

The Sun’s heat melts the snow

It changes it into water

Heating makes snow melt.

11

Water as a Gas

Rain makes the ground wet

Later the ground will be dry

The water will evaporate into the air

Evaporate means to change from a liquid

to a gas

The water evaporates.

12

The Sun’s heat dries the ground

It turns the water into a gas

The water goes into the air

Dirt is a solid

It does not evaporate

Dirt stays when the water evaporates

The dirt does not evaporate.

13

Some Things

Cannot Change

Back

You can toast a piece of bread

It is changed by heating

Heating cooks the bread

It makes it brown and crisp

The toast will never change back into bread

Heating changes

bread.

14

You can cook an egg

The egg is changed by heat

When the egg is heated it cooks

The cooked egg will never change back to

a raw egg

Heating changes

an egg.

15

dissolve spread throughout a liquid

evaporate change from a liquid to a gas

freeze change from a liquid to a solid

melt change from a solid into a

liquid

Glossary

16

What did you learn?

1 What happens to water when it is heated?

2 How does freezing change water?

describing ice cream before and after it melts Describe how it looks and feels

4 Put Things in Order Tell what happens

after a snowfall if the Sun comes out and

the air becomes warm Use the words fi rst, next, and last.