Question

ammonia gas is a pure substance. each molecule of the substance consists of one nitrogen atom that is chemically bonded to three hydrogen atoms. how is ammonia gas classified?
ammonia gas is a compound.
ammonia gas is an element.
ammonia gas is a homogeneous mixture.
ammonia gas is a heterogeneous mixture.

Explanation:

A compound is a pure substance formed when two or more elements are chemically bonded together. Ammonia (\(NH_3\)) has nitrogen (\(N\)) and hydrogen (\(H\)) chemically bonded. An element is a pure substance made of only one type of atom. A mixture (homogeneous or heterogeneous) contains two or more substances not chemically combined. Since ammonia is a pure substance with two types of atoms (\(N\) and \(H\)) chemically bonded, it is a compound.

Answer:

A. Ammonia gas is a compound.