Ch. 1 s.3
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| Physical change | a change in a substance that does not change its identity
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| Chemical change | a change in which one or more substances combine or break apart to form new substances
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| Law of conservation of mass | states that the total amount of matter is neither created nor destroyed during any physical or chemical change
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| Energy | the ability to do work
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| Temperature | a measure of the average energy of motion of the particles of a substance
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| Thermal energy | The total energy of all the particles of an object
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| Endothermic change | A change in which energy is taken in
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| Exothermic change | a change in which energy is taken off
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