A substance formed from two or more elements chemically combined in fixed proportions is a?

A substance formed from two or more elements chemically combined in fixed proportions is a?

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

Answer: (B)

The essential idea is that a compound is a pure substance formed when two or more elements join together chemically in a fixed ratio. In a compound, the elements are bonded and the overall composition is definite, described by a chemical formula such as H2O or NaCl. The properties of the compound are typically different from the properties of its constituent elements, reflecting the new substance that results from bonding. This fixed proportions aspect sets compounds apart from elements (which are just one type of atom) and from mixtures or solutions, where components can be combined in varying amounts and do not form a new substance with a single, fixed composition.

The essential idea is that a compound is a pure substance formed when two or more elements join together chemically in a fixed ratio. In a compound, the elements are bonded and the overall composition is definite, described by a chemical formula such as H2O or NaCl. The properties of the compound are typically different from the properties of its constituent elements, reflecting the new substance that results from bonding. This fixed proportions aspect sets compounds apart from elements (which are just one type of atom) and from mixtures or solutions, where components can be combined in varying amounts and do not form a new substance with a single, fixed composition.