Occurs when a substance changes phase
a.)physical
b.)chemical
c.)nuclear

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

22. the effect of threshold braking is to a cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic