A mixture that separates into different layers when you stop stirring it is Select one: a. a solution. b. a suspension. c. a colloid. d. an emulsion.

Answer: b suspension

a suspension is a heterogeneous mixture that contains solid particles sufficiently large for sedimentation. The particles may be

visible to the naked eye, usually must be larger than one micrometer, and will eventually settle, although the mixture is only classified as a suspension when and while the particles have not settled out. A suspension is a heterogeneous mixture in which the solute particles do not dissolve, but get suspended throughout the bulk of the solvent, left floating around freely in the medium. [1] The internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation, with the use of certain excipients or suspending agents.

An example of a suspension would be sand in water. The suspended particles are visible under a

microscope and will settle over time if left undisturbed. This distinguishes a suspension from a colloid, in which the suspended particles are smaller and do not settle.

Colloids and suspensions are different from

solution, in which the dissolved substance (solute) does not exist as a solid, and solvent and solute are homogeneously mixed.