homogeneous
As a child, you may have made suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water, known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible or that can be seen with a magnifying glass . They are cloudy, and the suspended particles settle out after mixing. On the other hand, when we make a solution, we prepare a homogeneous mixture in which no settling occurs and in which the dissolved species are molecules or ions. Solutions exhibit completely different behavior from suspensions. A solution may be colored, but it is transparent, the molecules or ions are invisible, and they do not settle out on standing. A group of mixtures called colloids or colloidal dispersions exhibit properties intermediate between those of suspensions and solutions Figure 11.30 . The particles in a colloid are larger than most simple molecules; however, colloidal particles are small enough that they do not settle out upon standing.