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 15C.

II and III only

I, II, III, and IV

I and III only

I, II, and III only

Question

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 15C.

II and III only

I, II, III, and IV

I and III only

I, II, and III only

barreraa · Answer

maybe A or C