Which of the following best describes a suspension?

A suspension is characterized by solid particles that are dispersed throughout a liquid medium, but these particles do not dissolve completely. Instead, they remain suspended in the liquid and require agitation or shaking to maintain an even distribution throughout the mixture. This is a fundamental property of suspensions; without mixing, the solid particles would settle to the bottom over time due to gravity.

The properties of suspensions apply in various contexts, such as in agriculture or pest control, where pesticide formulations might be designed as suspensions to ensure uniform application. Proper agitation during application ensures that the active ingredients are evenly distributed, leading to effective pest management.

As for the other descriptions, uniformly dissolved particles indicate a solution, where the solute completely integrates into the solvent, while solid particles that dissolve completely also refer to a solution. Conversely, a mixture of two immiscible liquids refers to an emulsion rather than a suspension. Therefore, the defining characteristic of a suspension revolves around the partial dissolution of solid particles within a liquid and the requirement for agitation to maintain homogeneity.