In a suspension, the particles are typically

In a suspension, the particles are indeed large enough to be seen and can settle out over time. This characteristic distinguishes suspensions from solutions, where solute particles are so small that they cannot be seen and do not settle. In a suspension, the dispersed particles are usually larger than 1 micrometer, which makes them visible to the naked eye, and they tend to gravitate toward settling when left undisturbed due to gravity acting upon them. This settling occurs because the larger particles in the suspension are not held in a stable dispersion like smaller particles in a solution.

Other options suggest characteristics that do not accurately describe a suspension. For instance, particles in a suspension are not invisibly small and evenly distributed; they are larger and can be easily distinguished. The notion of electrically charged particles typically applies to colloidal systems rather than suspensions, which may not necessarily involve ionic or charged interactions impacting stability in the same way. Lastly, while chemical reactions can produce suspensions, the formation is not a requisite defining feature of a suspension itself. Thus, understanding these distinctions clarifies why the assertion about visibility and settling reflects the true nature of suspensions.