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| A change in which the characteristics of a substance are only changed physically and the chemical composition stays the same. |
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| A change in which a substance (or substances) is changed into one or more NEW substances with different properties than the original substances. |
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| When substances interact to form one or more new substances with different properties than the original substances. |
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| 2 or more elements bonded together. |
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A substance composed of two or more different elements.
All compounds are molecules, but not all molecules are compounds! |
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| A combination of symbols and numbers that represent the number and types of elements (atoms) present in a compound. |
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| A small number to the right of a symbol that is written below the normal line of letters to show how many atoms of an element are present in a substance. No subscript means there is only one atom present. |
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| A number written in front of a chemical formula to show how many molecules of that substance are present. |
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| A combination of symbols and chemical formulas used to describe what happens in a chemical reaction. The equation identifies the reactants and resulting products. |
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| Formulas written on the left side of the arrow symbol (-->) are the starting substances in a chemical reaction. |
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| An arrow symbol that shows a reaction has taken place. The reactants have combined to produce a new substance (the product). |
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| Formulas written on the right side of the arrow symbol () are the new substances formed in a chemical reaction. |
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| A solid that forms as a result of a chemical reaction. It may appear cloudy and will fall to the bottom of the container over time. |
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| Law of Conservation of Mass |
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Definition
| Matter is not created or destroyed, only changed. The number of atoms in the reactants MUST BE EQUAL to the number of atoms in the product of a chemical equation. |
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