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