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thermal energy

the total energy of all of the particles in an object

chemical change

a change in matter that produces one or more new substances

physical change

any change that alters the form or appearance of matter, but does not make any substance in the matter into a different substance

law of conservation of mass

matter is not created or destroyed in any chemical or physical change


the ability to do work or cause change


a measure of the average energy of random motion of particles of matter

endothermic change

a change in which energy is taken in

exothermic change

a change in which energy is released


a substance that undergoes a ______ change is still the same substance after the change

examples of physical changes

dissolving, bending, crushing, breaking, chopping


a ________ change produces new substances with properties different from those of the original substances

examples of chemical changes

combustion, electrolysis, oxidation, tarnishing


every chemical or physical change in matter includes a change in ________


________ is related to the amount of thermal energy an object has

thermal energy

temperature is related to the amount of ________ an object has

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