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- Matter occupies space and has mass.
- Physical objects are made up of matter.
- Properties of matter include mass, volume, density, state, shape, and compressibility.
- Solids, liquids, and gases are the three states of matter.
- Physical changes do not alter the composition of matter.
- Chemical changes alter the composition of matter.
- Elements cannot be broken down into simpler substances by chemical means.
- Compounds are made up of two or more elements that are chemically combined.
- Mixtures are combinations of substances that are not chemically combined.
- Solids have a fixed shape and volume, liquids have a definite volume but not a definite shape, and gases have neither a definite shape nor a definite volume.
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