Question

which of the following is classified as a compound? *
silicon dioxide
hydrogen
oxygen
water
fire

Explanation:

A compound is a substance made up of two or more different elements chemically combined. Hydrogen and oxygen are elements. Fire is a chemical - reaction process, not a substance. Water (H₂O) is composed of hydrogen and oxygen elements chemically bonded together. Silicon dioxide (SiO₂) is also a compound made of silicon and oxygen.

Answer:

C. water