Question

11
directions: select all the correct answers.
hannah does an experiment. she has two colorless chemicals that she mixes together in a beaker. which observations indicate that a chemical change occurs when she mixes the two chemicals together?
a brown solid forms in the bottom of the beaker.
the temperature of the chemicals rises 15°c.
a yellow gas forms.
the chemicals change color from colorless to purple.

Explanation:

Chemical changes produce new substances, indicated by signs like precipitate formation, temperature change (energy transfer), gas production, or color change. All options describe such signs.

Answer:

A. A brown solid forms in the bottom of the beaker, B. The temperature of the chemicals rises 15°C, C. A yellow gas forms, D. The chemicals change color from colorless to purple