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 form.
III. A brown solid forms in the bottom of the beaker.
IV. The temperature of the chemicals rises 15°C.
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Answers: 2
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