Question

1. classify each of the following as a suspension, colloid, or solution. explain your reasoning. (hint: in some cases more than one answer may be possible.) a) a mixture is poured through a filter, and the entire mixture passes through. b) a mixture is left to stand for a while and small particles settle out. c) when viewed under a microscope, small particles are visible in the mixture. d) a beam of light passed through the mixture is scattered. e) the mixture is blue and transparent. 2. suggest a method by which you could separate the various materials in each of the following mixtures: a) solutions b) colloids c) suspensions

Explanation:

Step1: Analyze suspension properties

Suspensions have large - sized particles that settle out over time and can be filtered out. Since the mixture in a) passes through a filter completely, it is not a suspension.

Step2: Analyze colloid properties

Colloids have particles that do not settle out quickly and can scatter light (Tyndall effect). The mixture in d) scatters light, which is a characteristic of a colloid.

Step3: Analyze solution properties

Solutions are homogeneous mixtures with very small particles that do not settle out and do not scatter light. The mixture in c) is blue and transparent, which is typical of a solution.

Step4: Analyze mixture in b)

The mixture in b) has small particles that settle out when left to stand, which is a characteristic of a suspension.

Step5: Analyze mixture in e)

The mixture in e) has small visible particles under a microscope, which indicates it is a suspension.

Answer:

a) Solution. Explanation: Passes through filter completely, indicating small - sized particles like in a solution.
b) Suspension. Explanation: Small particles settle out over time.
c) Solution. Explanation: Blue and transparent, typical of a homogeneous solution.
d) Colloid. Explanation: Scatters light, showing the presence of colloidal particles.
e) Suspension. Explanation: Small visible particles under microscope, characteristic of a suspension.

2.

Step1: Separation of solutions

For solutions, techniques like evaporation (if the solute is a solid and the solvent is a liquid) can be used to separate the components. For example, salt - water solution can be separated by evaporating the water.

Step2: Separation of colloids

Centrifugation can be used to separate colloids. The high - speed rotation causes the colloidal particles to separate from the dispersion medium.

Step3: Separation of suspensions

Filtration is an effective method for separating suspensions as the large particles can be trapped by the filter paper while the liquid passes through.