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Chapter 2- Chemistry

In any chemical or physical process, the total mass of everything involved must remain the same
A pure substance that is composed of two or more elements
A substance that cannot be chemically broken down into simpler substances
A mixture whose composition is the same throughout the sample
A given compound will always have the same proportion of elements by mass
Two or more atoms of the same element that have different numbers of neutrons
A combination of two or more atoms joined together
When two elements combine to form different compounds, a fixed amount of one element will combine with the other element so that ratio of the masses of the other element is a small whole number.
A mixture whose composition is different in different parts of the sample.
A substance whose properties are the same throughout.
A combination of two or more pure substances.