Which statement best describes a solution?

• A. A solution is a heterogeneous mixture with visible phases.
• B. A solution is a pure substance composed of only one type of atom.
• C. A solution is a compound formed by a chemical reaction between two elements.
• D. A solution is a homogeneous mixture of two or more substances.

Answer: (D)

Verified step by step guidance

1. Understand the definition of a solution in chemistry: A solution is a homogeneous mixture, meaning its composition is uniform throughout and the different components are not visibly distinguishable.
2. Recognize that a heterogeneous mixture has visibly different phases or parts, so it cannot be a solution.
3. Recall that a pure substance consists of only one type of atom or molecule, which is different from a mixture; therefore, a solution is not a pure substance.
4. Know that a compound is formed by a chemical reaction creating new chemical bonds, whereas a solution is a physical mixture without chemical bonding between components.
5. Conclude that the best description of a solution is a homogeneous mixture of two or more substances, where the solute is uniformly dispersed within the solvent.