12. temperature 13. exothermic change

14. chemical energy

15. endothermic change

16. thermal energy

17. law of conservation of mass

18. physical change

19. chemical change
a. the energy stored in the chemical bonds between atoms
b. a change in which energy is absorbed
c. a measure of the energy of motion of the particles of matter
d. the total energy of all of the particles in an object
e. the fact that matter is neither created nor destroyed in any physical or chemical change
f. a change in which energy is released
g. a change in matter that produces one or more new substances
h. alters the form or appearance of matter but does not turn any substance in the matter into another substance