Pure Substances, Mixtures, and How to Separate Them

What is the difference between a suspension and a solution?

(Choose the best answer.)

• A solution is heterogeneous, while a a suspension is homogeneous.

• A suspension loses it's form, a solution does not.

• A suspension is spread unevenly throughout the mixture, while a solution is evenly distributed.

• They have no difference.

A mixture consists of two or more elements or compounds that are chemically combines, not physically mixed.

• True

• False

A mixture of two or more uniformly dispersed substances is a ________________.

• colloid

• solution

• suspension

A ___'s particles sink to the bottom.

Immiscible liquids such as oil and water are?

• Homogeneous

• Heterogeneous

• Solution

All of these about colloids are correct except?

• Solid dispersed in liquid media is a sol.

• A liquid dispersed in liquid media is an emulsion.

• A gas dispersed in a gaseous medium is an aerosol.

• Foam is an example of gas being dispersed in solid media.

Answer explanation

Gas dispersed in a gaseous medium will end up mixing, forming a solution instead of a colloid.

Aerosol is liquid dispersed in gas.

What is the process of separating immiscible liquids called?

• Decantation

• Evaporation

• Filtration

• Distillation

Which of the following is an example of a colloid?

• Air

• Sand

• Water

• Milk

What process is used to separate saltwater?

• Distillation

• Evaporation

• Filtration

• Centrifugation

which of the following is true about the tyndall effect?

• Light is scattered by colloidal particles.

• The particles can be easily identified as they remain suspended within the liquid.

• Particles become big enough and settle at the bottom when left untouched.

• The particles cannot be distinguished from one another.