Which term describes a mixture that does not settle out?

• A. Suspension
• B. Emulsion
• C. Solution
• D. Formulation

Answer: (C)

A solution is a uniform mixture in which the substance (solute) is dissolved in another (solvent) at the molecular level. Because the particles are so small and evenly distributed, they don’t settle out under gravity, so the mixture stays uniform over time. This is why it’s described as not settling.

A suspension has larger particles that can remain dispersed for a while but will eventually settle to the bottom. An emulsion consists of tiny droplets of one liquid dispersed in another immiscible liquid and can separate unless stabilized. A formulation is a general term for a prepared product designed for a specific use and doesn’t by itself imply that the mixture will not settle.