Atom - the basic unit of a chemical element, Element - any substance that cannot be broken down into simpler substances, Compound - a substance made up of two or more elements chemically combined, Pure Substance - a single kind of matter that cannot be separated into other kinds of matter by physical means , Homogeneous Mixture - a substance that has uniform composition throughout , Heterogeneous Mixture - a substance that does not have uniform composition, Solution - a homogeneous mixture of two or more substances, Melting Point - the point at which a substance goes from a solid to a liquid, Boiling Point  - the point at which a substance goes from a liquid to a gas, Chemical Property - describes the ability of a substance to undergo a specific change to make a new substance, Physical Property - a characteristic of a substance that can be observed without changing the identity of the substance , Chemical Change - a irreversible reaction that results in a new substance being made , Physical Change - a change in matter that does not result in a new substance being made,

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