UNIT 7: matter, materials and mixtures

Matter, materials and mixtures

Unit 7: 3rd grade

What is matter?

Matter is everything around you, for example: rocks, a pen, water and even people are made of matter. It is everything that has got weith, volume and takes up space.

Index of the unit

Where do materials come from?

Matter changes

Mixtures

Matter changes

Physical changes

chemical changes

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physical changes

Matter has got different properties (shape, size and state). These properties can change. These changes are called physical changes. We can distinguish between change of state and change of shape.

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Change of state

• The states of matter are: solid, liquid and gas.
• Solid can become liquid and liquid can become gas. Moreover, gas can become liquid and liquid can become solid.

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Change of shape

• We can modify the shape by pressing and stretching.
• For example: rubber or plasticine.

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Chemical changes

Sometimes matter reacts with air, water and other elements. These reactions are the chemical changes.

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Combustion

• When we burn paper the reaction is called combustion. The paper becomes another matter called ash.

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Oxidation

• It is produced when metal reacts with water and air (oxygen) and changes into a different matter.

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Mixtures

A mixture is something that has got two or more different materials. In some of them we can see the materials and in others it's impossible to see them.

WE CAN'T SEE THE MATERIALS

WE SEE THE MATERIALS

Separating materials in a mixture.

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We see the materials

Oil and water

Sand and water

Salad

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We can't see the materials

Lemonade

Smoothie

Coffee with sugar

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Separating materials in a mixture

We can separate materials in a mixture by sieving, filtering or evaporating.

Sieving

Filtering

Evaporating

Sieving

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Fiiltering

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Evaporating

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Where do materials come from?

We can classify materials in: natural materials and manufactured materials.

Natural materials

Manufactured materials

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Natural materials

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From plants

From animals

From the ground

feathers and wool

slate and iron

cotton and wood

manufactured materials

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Paper from wood

Fabric from wool

Plastic from crude oil

Paper from wood

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Fabric from wool

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