7 UNIT
MATTER AND ITS PROPERTIES
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Matter is anything that has mass and space.
DESCRIBING MATTER
*Matter has four
properties:
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Size: big or small.
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Shape: regular or irregular.
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Colour: blue, red, yellow.
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Texture: rough or smooth.
*We can measure
length, volumen and mass:
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Length: If an object is short or long.
We measure
length in metres.
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Volume: Is the space an object occupies.
We measure volume in litres.
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Mass:
If an object is heavy or light.
We measure mass in
grammes
and kilogrammes.
THE THREE STATES OF MATTER
We can find matter
in three
different states:
SOLIDS
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Solids have a
definite volume and shape.
LIQUIDS
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Liquids have a
definite volume, but they don´t have a definite shape.
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They take the shape of their container.
GASES
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Gases don´t have a definite volume or shape.
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They take the shape and the volume of their container.
NATURAL AND MAN-MADE MATERIALS
NATURAL
MATERIALS
*We find naturals
materials in nature.
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Minerals
o We find minerals
in rocks.
o We use them as
fuel, to make other materials like glass…
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Wood
o Wood comes from
trees.
o We use it, to
make different things like paper and furniture.
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Cotton
o Cotton comes from
the cotton plant.
o We use it to
make textiles and clothes.
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Crude oil
o We find crude oil
underground.
o We use it to make
petrol, plastic…
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Leather
o Leather comes from
animal skins.
o We use it to
make clothes, shoes…
MAN-MADE
MATERIALS
*We can transform naturals materials.
When we transform
a natural material into another, we make man-made materials.
CHANGES IN MATTER
PHYSICAL
CHANGES
-
When we change size, colour or shape we are making
physical changes. For example, when we cut a piece of paper.
MIXTURES
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Mixture are two or more kinds of matter that can be separated. For
example, when we make a salad.
CHEMICAL
CHANGES
When
we transform one material into another, we make a chemical
change. For example, when we burn wood
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