matter can exist in three forms or phases: solids, liquids, or gases.
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mixtures
a mixture is a material made up of two or more different chemical substances which are not chemically bonded (physical combinations)
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pure substances
A substance that has a fixed chemical composition throughout such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
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elements
refers to a simple substance that cannot be broken down into smaller parts or changed into another substance
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compounds
A chemical compound is a chemical substance composed of many identical molecules containing atoms from more than one chemical element held together by chemical bonds
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states of matter
one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.
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chemical properties
any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity.
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physical properties
any property that is measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe its changes between momentary states
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physical change
A change in matter which does not alter the chemical properties of the matter
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chemical change
are not reversible except by further chemical reactions.
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