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| substance made up of 2 or more elements, chemically combined. |
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| smallest part of a substance that has all the properties of the substance. |
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| 2 or more substances that have been mixed together but NOT chemically combined. |
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| ions arranged in a regular pattern. |
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| an atom with an electrical charge |
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| bond formed between atoms that have gained and lost electrons. |
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| bond formed when atoms share electrons. |
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| way of writing the name of a compound using chemical symbols. |
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| number written to the lower right of a chemical symbol. |
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| number of electrons an atoms gains, loses, or shares when it forms a chemical bond. |
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| electrons in an atom's outer energy level |
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| process in which new substances with new chemically and physical properties are formed. |
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| substance that is formed in a chemical reaction |
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| substance that is changed in a chemical reaction |
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| statement in which chemical formulas are used to describe a chemical reaction |
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| # that shows how many molecules of a substance are involved in a chemical reaction. |
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| chem. reaction in which electrons are lost. |
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| chemical reaction in which electrons are gained |
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| reaction in which substances combine to form a more complex substance. |
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