Chapter 10Changing Matter

Physical ChangesLesson 2

VocabularyPhysical Change: a change in the way matter looks.

Tearing a sheet of paper is a physical change.

Mixture: different kinds of matter mixed together. When you pour milk in cereal you have a mixture.

Solution: forms when one or more kinds of matter are mixed evenly into another kind of matter.

What are physical changes?• A physical change is a change in the way

matter looks.• Tearing a sheet of paper is a physical change.• The size and shape of the paper is different,

but the paper is still paper.• A change of state is also a physical change.

When liquid freezes, its state changes but it is still water.

When happens when you mix matter?• Another kind of physical change is a mixture.• A mixture is different kinds of matter mixed

together.• When you pour milk on your cereal, you are

making a mixture.• In a mixture the properties of each kind of

matter might change. The cereal may get soggy.• A mixture can be a combination of solids, liquids, and gases.

Solutions

• One kind of mixture is a solution.• A solution forms when one or more kinds of

matter are mixed evenly into another kind of matter.

• Salt water is a solution. If you add salt to water, the salt mixes evenly with the water.

• Some solutions contain no liquids at all. Air is a solution of different gases

How can mixtures be separated?• Some properties help you separate mixtures.• These properties include size, shape, and

color. • One way to separate a mixture is to pick out

each different type of matter.• Another way is by evaporation. Leave a

solution of salt and water in a warm place. As the water evaporates, the salt is left behind.

• Filters separate mixtures by size • Magnets separate certain metals from other

objects