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| The ability to do work or cause change. |
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| A single kind of matter that has distinct physical and chemical properties. |
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| A characteristic of a substance that can be observed without changing the substance into something else. For example: hardness, texture, or color. |
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| A characteristic that is observed when a substance interacts with another substance. For example: flammability. |
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| A substance that cannot be broken down into any other substances by chemical or physical means. All of the atoms are the same as in Gold, Oxygen, or Silicon. |
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| A substance made of two or more elements chimically combined in a set ratio, or proportion. For example, a carbon dioxide is made of one atom of carbon and two atoms of oxygen. |
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| A substance made from 2 or more substances-elements, compounds, or both-that are in the same place, but that are not chemically combined. They are different from compounds because they retain their individual properties and their parts are not necessarily present in set ratios. |
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| A change that alters the form or physical appearence of a material but does not make the material into another substance. |
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| Forms of matter, solid, liquid, or gas...(plasma). |
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| A change in matter that results in a new substance. |
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