Mixtures & Solutions

A solid is stirred into a liquid and dissolves. Which type of mixture forms?

• A. a colloid

• B. an emulsion

• C. a solution

• D. a suspension

In which situation can a mixture always be called a solution?

• A. when one of its components is gas

• B. when there is no solvent in the mixture

• C. when its components are made up of different types of particles

• D. when the mixture is homogeneous

Which solution is a homogeneous mixture?

• A. Sand and water

• B. Salt and water

• C. Salad dressing

• D. Soil

Which statement best describes the formation of a solution?

• A. A large amount of solute is dissolved in a smaller amount of solvent.

• B. A small amount of solute is dissolved in a larger amount of solvent.

• C. A small amount of solvent is dissolved in a larger amount of solute.

• D. A large amount of solvent is dissolved in a larger amount of solute.

Which best explains why blood is considered to be a suspension?

• A. It has nutrients that cannot be dissolved.

• B. It contains particles that can settle out.

• C. It has nutrients that are dissolved in its liquid portion.

• D. It contains particles that mix on a molecular level.

Milk is a heterogeneous mixture that contains different types of particles in different phases. Due to the sizes of the particles in milk and the way they are dispersed, the particles do not easily settle out. They also cannot easily be filtered out.

Therefore, milk is best described as a ___________.

• A. Solution

• B. Suspension

• C. Compound

• D. Colloid

The water in a 150-mL flask is poured into a beaker that contains 600 mL of ethyl alcohol. Which substance is the solvent in this mixture?

• A. water because it is a very polar compound

• B. ethyl alcohol because it has a lower density than water

• C. ethyl alcohol because it has a much larger volume than water

• D. water because it has dissolved in ethyl alcohol

Mixture A was made by mixing different components together, but it appears to have one phase. Which term best categorizes mixture A?

• A. Colloid

• B. Solution

• C. Emulsion

• D. Suspension

Which statement best describes a true solution?

• A. A true solution will settle out after a short period of time.

• B. A true solution coagulates when heated or boiled.

• C. A true solution will not separate in a centrifuge.

• D. A true solution has a cloudy appearance.

Which is a characteristic of a homogeneous mixture that is a liquid?

• A. It exhibits the Tyndall effect.

• B. Brownian motion is not visible in it.

• C. It cannot be separated using filtration.

• D. It has at least two phases.