Question

sewage treatment plants use settling tanks to separate raw sewage into solid and liquid components. what type of mixture might include a solid component that separates from a liquid component by settling over time? a. solution b. heterogeneous c. colloid d. homogeneous

Explanation:

A solution is a homogeneous mixture where the solute is uniformly distributed in the solvent and does not separate over time. A heterogeneous mixture has visibly different parts and components can separate. A colloid has particles intermediate in size between a solution and a heterogeneous mixture, which do not settle out quickly but can be separated by some methods. In sewage treatment, the solid - liquid mixture that separates into solid and liquid components by settling over time is a heterogeneous mixture as the components are visibly different and separate due to gravity. A homogeneous mixture would not separate in this way.

Answer:

B. heterogeneous