What term describes a pure substance formed when two or more elements chemically combine?

What term describes a pure substance formed when two or more elements chemically combine?

• A. Element
• B. Suspension
• C. Compound
• D. Mixture

Answer: (C)

When elements join by chemical bonds in a fixed ratio, they form a compound. A compound is a pure substance with its own definite composition and new properties, different from the elements that make it up. For example, hydrogen and oxygen combine in a 2:1 ratio to produce water, which has characteristics (like being a liquid at room temperature) that neither hydrogen gas nor oxygen gas has on their own. Elements by themselves are pure substances made of one type of atom, while a suspension and a mixture lack a fixed composition and chemical bonding. A suspension has particles dispersed in a medium that can settle out, and a mixture simply combines substances without forming new bonds. So the term for a pure substance formed when two or more elements chemically combine is a compound.

When elements join by chemical bonds in a fixed ratio, they form a compound. A compound is a pure substance with its own definite composition and new properties, different from the elements that make it up. For example, hydrogen and oxygen combine in a 2:1 ratio to produce water, which has characteristics (like being a liquid at room temperature) that neither hydrogen gas nor oxygen gas has on their own. Elements by themselves are pure substances made of one type of atom, while a suspension and a mixture lack a fixed composition and chemical bonding. A suspension has particles dispersed in a medium that can settle out, and a mixture simply combines substances without forming new bonds. So the term for a pure substance formed when two or more elements chemically combine is a compound.