ELEMENTS, COMPOUNDS, MOLECULES AND MIXTURES

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9 Terms

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Elements
Substances made up of only one type of atom
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Compounds
Substances made up of two or more different types of atoms
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Molecules
Substances made of two or more atoms
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Mixtures
Two or more substances mingled together but not chemically combined
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Note
All compounds are molecules, but not all molecules are compounds
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Physical Change

A change in which no new substance is formed.

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Ex. of Physical Change
Melting ice, crumpling paper, chopping wood etc.
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Chemical Change

A change in which new substances are formed. (Normally irreversible) (If heat is involved)

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Ex. of Chemical Change
Decaying/souring of food, baking a cake, digesting food, burning paper etc.