skatingflower3
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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, II, III, and IV C. I and III only D. I, II, and III only

Respuesta :

B

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carminahershey

Answer:

B. I, II, III, and IV

Explanation:

A chemical change occurs when the original substances (the reactants) are changed into a new substance or substances (the products). A chemical change can be indicated by a color change, gas formation, solid formation, or a temperature change. I, II, III, and IV all indicate that a chemical change has occurred when Hannah mixes the two chemicals