CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
Which of the following observations, by itself, is LEAST likely to serve as evidence that a chemical change has occurred?
(a) A colorless solution turns pink after two solutions are mixed
(b) Formation of bubbles when zinc is placed in hydrochloric acid
(c) The temperature of a solution rises by 10∘C when two substances are combined
(d) Melting of an ice cube at room temperature