Chemistry › Section A · Essential ideas › Topic A.2
Phases and classification of matter
Millions of different materials exist, but chemists sort them all with a few simple questions: what state is it in, is it one substance or several, and can it be broken down? Learning to ask those questions is the first step to understanding any sample.
In this topic
- What counts as matter
- Solids, liquids, gases and plasma
- Mass and weight
- Conservation of matter
- Worked example: burning magnesium
- Pure substances and mixtures
- Elements and compounds
- Homogeneous and heterogeneous mixtures
- Atoms and molecules
- Worked example: sorting four samples
- Common mistakes to avoid
- Key takeaways
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