1. Unit 4: What is Matter Made of?

2. Matter Chemical Elements Atoms Combining Combining Pure Substances
Gold, Aluminium
made up
Chemical Elements
Atoms
Combining
Combining
Pure Substances
Molecules or
Groupings of atoms
made up
Chemical Compounds
Water, Carbon Dioxide
Matter
Homogeneus Mixtures
Air, Milk
Mixtures
Heterogeneus Mixtures
Rock salt (rock + salt)

3. Chemical Elements They contain only one type of atom.
There are about 100 different elements.
The periodic table is a helpful way of
showing all the elements.
Chemical Elements
Each element has a symbol which can
be used to identify it.
Example: Carbon – C

4. Compounds They have been formed from the
atoms of two (or more) elements.
Compounds
Each compound has a formula.
Example: Sodium Chloride – HCl