(1) can be classified into two broad categories: (2) and (3) A pure substance is a form of matter that has a a composition (meaning that it is the same everywhere) and properties that are constant throughout the sample (meaning that there is only one set of properties such as melting point, color, boiling point, etc. throughout the matter). A material composed of two or more substances is a (5)_ and (7) are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element (8) which is used in soda cans, is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is a compound. For example, water is a and (10) compound composed of the elements (9)_ Today, there are about 118 elements in the known universe. In contrast, scientists have identified tens of millions of different compounds to date.
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