Which of the following observations provides the strongest evidence that a chemical…
CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
Which of the following observations provides the strongest evidence that a chemical change has occurred?
(a) Liquid water boils vigorously, producing many bubbles.
(b) Solid iodine forms a purple vapor when gently heated.
(c) A sugar cube dissolves completely in hot tea without any noticeable temperature change.
(d) Effervescence is observed when dilute hydrochloric acid is added to zinc metal.