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changes to the composition of the substance due to a reaction between substances
examples of physical properties
density, color, hardness, freezing point, boiling point, conduction of electrical currents
a substance that cannot be separated or broken down into simpler substances by chemical means
smallest unit of an element that has the chemical properties of that element; each element is made up of one kind of element
subatomic particle in the nucleus that has a neutral charge (no charge positively or negatively)
one f two or more atoms that have the same number of protons, but different numbers of neutrons.
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