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| study of the composition, structure, and properties of matter and energy and changes that matter undergoes |
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| anything that occupies space and has mass |
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One type of substance
definite (constant) composition and distinct properties
Cannot be separated by physical processes |
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| Cannot separate into simpler substance by chemical means |
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| Can separate into simpler substance by chemical means |
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Two or more types of substances
Variable composition
Can separate by a physical process |
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| particles packed close, no movement between atoms |
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| particles somewhat close, some movement (energy) |
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| very little attraction between particles and lots of movement |
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| description by senses, shape, color, odor, etc |
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| new form of old substance, no new sunstances formed |
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old substance destroyed
new substance formed |
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| list of chemical changes possible |
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