Question

Fill in the blank:

A ____ is composed of two or more elements in a _______ proportion by weight.

• A. compound
• B. fixed

Answer 1

A compound is composed of two or more elements in a fixed proportion by weight.

Compound-

• It is a substance that is composed of two or more elements chemically combined together in a fixed proportion by weight.
• The properties of compounds are different from the combined elements' properties.
• For example-
• Hydrogen and oxygen are chemically combined with water.
• $\underset{\mathrm{Hydrogen}\mathrm{gas}}{2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}\mathrm{gas}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$
• The properties of water are entirely different from hydrogen and oxygen.

Hence, A compound is composed of two or more elements in a fixed proportion by weight.