Which is not proof that a chemical change has occurred?
a. the color changes
b. a precipitate forms
c. the substance melts
d. bubbles are produced

the substance melts

Choice C

Explanation:

A chemical change refers a process by which one substance changes into a new substance with different properties with the formation of one or more new substances.

Color change, formation of a precipitate and production of bubbles all indicate the occurrence of a chemical change. On the other hand, melting is purely a physical change since no new substance is formed and the process can easily be reversed through freezing.

If you were interested in these activities you would most likely be "administrative and legal personal assistant" since this is the only position that would allow you to work directly under a specific Congressperson.