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01/05/2015
Chemistry Unit C1 ­
Chemistry in our World
EdExcel…read more

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01/05/2015
Elements
If a solid, liquid or gas is made up of only one type of
atom we say it is an element. For example, consider a
tripod made up of iron:
These atoms are
ALL iron ­ there's
nothing else in here…read more

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01/05/2015
Compounds
Compounds are
different to
elements. They
contain different
atoms. Here are
Methane
some examples:
Sodium
chloride (salt)
Glucose…read more

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01/05/2015
Some simple compounds...
Carbon
Methane, CH4 Water, H2O dioxide, CO2
Key
Hydrogen
Oxygen
Ethyne, C2H2
Sulphuric Carbon
acid, H2SO4
Sulphur…read more

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01/05/2015
Balancing equations
Consider the following reaction:
Sodium + water sodium hydroxide + hydrogen
Na
Na + O +
H H H
H H O
This equation doesn't balance ­ there are 2 hydrogen
atoms on the left hand side (the "reactants" and 3 on
the right hand side (the "products")…read more

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