Question

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?

1)A solid forms, and there is a change of color.
2)A gas forms, and there is a change of color.
3)A solid forms, and light is emitted.
4)A gas forms, and light is emitted.

Answer 1

A solid forms, and there is a change of color.

Answer 2

Chemical reactions involve the breaking of bonds and forming new bonds. All chemical reactions involves forming of new substances. For this, stuation, it is evident that a chemical reaction occur because a precipitate formed. Therefore the correct answer is stated in statement 1.