Hannah does an experiment. She has two colorless chemicals that she mixes together in a beaker. Which of the following indicates
that a chemical change occurs when she mixes the two chemicals together? I. The chemicals change color from colorless to purple.
II. A yellow gas forms.
III. A brown solid forms in the bottom of the beaker.
IV. The temperature of the chemicals rises 15°C.
A.
II and III only
B.
I and III only
C.
I, II, III, and IV
D.
I, II, and III only
