Which of the following indicates that a chemicl change has taken place?

(a) a change from liquid to a gas
(b) an increase in the volume of a substance
(c) a change in the color of a substance
(d) a change from a solid to a liquid

a precipitate is a gas formed from the chemical of two substance.

(a)true
(b)false

which of the following is a chemical change?

(a) melting ice
(b) boiling water
(c) a burning candle
(d) frost forming inside a freezer