Which of the following describes chemical properties? check all that apply. a. helium is the lightest monatomic element. b. mercury is a liquid at room temperature. c. antacid tablets neutralize stomach acid. d. water boils at 100 degrees celsius.

Option (C) is the correct answer.

Explanation:

Chemical properties are defined as the properties that arise due to change in chemical composition of a substance.

For example, combustion, reactivity, toxicity etc are all chemical properties.

So, when an antacid is able to neutralize stomach acid then it shows reactivity of antacid with the stomach acid. Hence, it is a chemical reaction.

On the other hand, physical properties are defined as the properties which does not change the chemical composition of a substance.

For example, mass, density, volume, size, shape etc are all physical properties.

Helium is the lightest monatomic element. This shows mass of helium is less which is a physical state.

Mercury is a liquid at room temperature shows physical state of mercury.

Water boils at 100 degree celsius shows state of water changes at 100 degree celsius.

Thus, we can conclude that antacid tablets neutralize stomach acid describes CHEMICAL PROPERTIES.