MATTER

RaúlMiguel

Alejandro

MATTER IS ALL AROUND US• There are three states of matter: solid, liquid and gas. – Solids have a definite shape and a definite volume

because they take up the same space.

– Liquids don’t have a definite shape but they always take up the same space.

– Gases don’t have a definite shape because they adapt to shape of the container they are in and they don´t have a definite volume because they expand to fill the container they are in.

CHANGES IN MATTER• Physical changes happen when matter

changes shape and state but the substance doesn’t change.

• Physical changes can happen .when we heat, freeze, bend, twist, strech or squash a substance.

• A chemical change is when a new substance is produced.

• Chemical change can happen when we burn a

substance or expose a substance to air.

MIXTURES• A mixture is something that contains two or more

substances.

• We can find examples of mixtures in nature. Air is a mixture of gases. Saltwater in the sea, many rocks, etc…

• In a heterogeneous mixture it´s easy to see the different substances. In a homogeneous mixture it isn´t possible to see the different substances.

PROPERTIES OF MATERIALS• A resistant material is difficult to break, but a fragile material

breaks easily.• A rigid material doesn’t bend easily, but we can bend a flexible

material. An elastic material returns to its original shape.• Light can pass through transparent material, but light can’t pass

through opaque materials. Water can pass through permiable materials whereas water can’t pass through waterproof materials.

• Heat passes through heat conductors but heat can’t pass through heat insulators easily.

NATURAL AND MANUFACTURED MATERIALS

• We can classify materials into natural materials and manufactured materials.

• Natural materials come from nature and can come from plants, animals or minerals.

• Wood, cotton and natural rubber come from plants. Wool, leather and silk come from animals, and rocks and oil come from minerals.

• Manufactured materials are made from natural materials which are transformed in a manufacturing process. We manufactured glass from sand, and we use oil to make plastic, crayons and fabrics such as nylon.

THE THREE RS

• If we take too many natural resources, they will run out. This is why it’s important to Reduce, Reuse and Recycle.

• We should try to reduce the amount of materials we use and the waste we produce. Buy products with little or no packaging, then put the packaging in the correct recycling bin.

• We can reuse plastic shopping bags. We can clean packaging such as boxes and jars and use them again.

• Recycle means to make something new from something we have used. • We can recycle glass, plastic, aluminium, paper, cars, electrical appliances, furniture and many more things too.