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| any change that alters the form or appearance of a substance but does not change it into another substance |
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| a change in matter that produces one or more substances |
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| substances that undergo chemical change |
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| the new substances that form after a chemical change |
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| a solid that forms from two liquids during a chemical reaction |
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| the energy released as the products form is greater than the energy required to break the bonds of the reactants (feels cold) |
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| the energy released as the products form is less than the energy required to break the bonds of the reactants (feels warm) |
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| a way to show a chemical reaction, using symbols instead of words |
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| law of conservation of mass |
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Definition
| states that during a chemical reaction, matter is not created or destroyed |
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| matter can enter from or escape to the surroundings |
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| matter does not enter or leave |
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| a number placed in front of a chemical formula in an equation |
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| when two or more elements combine to make a more complex substance |
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| when compounds break down into simpler products |
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| when one element replaces another element in a compound, or if two elements in different compounds trade places |
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| the minimum amount of energy needed to start a chemical reaction |
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| the amount of a substance in a given volume |
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| increases the reaction rate by lowering the activation energy needed |
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| biological catalyst that helps body reactions occur at body temperature |
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| a material used to decrease the rate of chemical reaction |
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