Most substances can exist in any of the three states of matter, depending on their temperature. Water if the perfect example: water, steam, and ice.
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substance
Calcium oxide
Potassium has a chemical symbol that is derived from a Latin name.
A chemical property is the substance's response to other substances, resulting in a new substance. A physical property is something like a substance's lustre, melting point, boiling point, colour, or density, to name a few. Examples of chemical properties are: combustibility and reaction to acid.
A name. And to be scientific everything is matter and contains atoms.