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Contents
8F Compounds and Mixtures
Comparing elements and compounds
Compound names and formulae
Word equations
Mixtures
Summary activities
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Properties of elements and compounds
Why is it safe to put sodium chloride on fish and chips...
...but not safe to use sodium and chlorine?
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Atoms in elements and compounds
Elements are materials made up of one type of atom only.
The element, hydrogen, exists
as molecules.
Each hydrogen molecule is
made up of two hydrogen atoms
H H
joined together.
Compounds contain two or more different types of atom.
The compound, water, exists
as molecules.
Each water molecule consists
of two hydrogen atoms joined
to one oxygen atom.
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Element or compound?
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Making a compound ­ water
A compound is made when atoms of different elements
react and join together.
For example, water is produced from the chemical reaction
between hydrogen and oxygen.
hydroge oxyge wate
n + n r
H H
+ O O
H H
Two hydrogen molecules react with one oxygen molecule
to produce two molecules of water.
Why does water have different properties to its elements?
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