Chemical Properties — Quiz

Question 11 • Physical Science

Which statement best describes chemical properties of matter?

Answer

Chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.

Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

Chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.

Explanation

Chemical properties describe how a substance can undergo a chemical change, in which its identity changes and new substances form. Combustibility is a chemical property because burning produces new substances. Boiling point and density are physical properties, so choices A and C misclassify them; reactivity does not have to be observed only at room temperature and normal atmospheric pressure.

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