A change in state (phase change) occurs when thermal energy is added or taken away from a system. True

False

When undergoing chemical reactions where does the reactant combine to the enzyme?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12