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A single substance, with a fixed composition, that does not have anything else mixed with it.
A substance that is not pure.
A substance made up of only atoms with the same number of protons in the nucleus.
A substance that can be split into simpler substances, because it contains the atoms of two or more elements joined together.
Two or more substances jumbled together but not joined to each other. The substances in many mixtures can be separated from each other.
Melting point
A specific temperature at which a solid turns into a liquid.
Physical property
A description of how a material behaves and responds to forces and energy. For example, hardness is a physical property.