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11 Cards in this Set
- Front
- Back
physical property
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characteristic of a substance that can be observed without changing the substance (temperature, etc.)
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chemical property
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characteristic of a substance that describes it’s ability to change into other substances (to observe, must change)
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physical change
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changes form or appearance but doesn’t change substance into something else
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chemical change
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atoms are rearranged to form new substances, chemical bonds break and new bonds form
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reactants
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chemicals that undergo a chemical change
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products
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the chemicals created by reactants
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precipitate
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solid that forms from solution during a chemical reaction
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endothermic reaction
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a reaction that absorbs energy (gets cold)
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exothermic reaction
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a reaction that releases energy (gets hotter)
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chemical equation
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an equation that shows a chemical reaction using symbols (like Na, C, H20)
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conservation of matter
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matter canNOT enter and escape from the reaction (bell jar)
coefficient a number placed in front of a chemical formula to tell you the relative amount of a reactant or product used in the reaction |