Scientific Principles: Solutions, Emulsions & Colloids Quiz

Which of the following is NOT true about mixtures? A. Mixtures are a combination of two or more substances which are not chemically united B. Mixtures are a combination of two or more substances which exist in a fixed proportion to each other C. Mixtures are a combination which can be physically separated into pure compounds D. Mixtures are a combination which can have changing physical properties

• A. Mixtures are a combination of two or more substances which are not chemically united

• B. Mixtures are a combination of two or more substances which exist in a fixed proportion to each other

• C. Mixtures are a combination which can be physically separated into pure compounds

• D. Mixtures are a combination which can have changing physical properties

A mixture which has an even concentration throughout is known as a __________.

• Heterogeneous mixture

• Solution

A solution is made by dissolving 125 g of sodium chloride in 1.5 kg of water. What is the percent by mass?

• 6.25

• 23.8

• 7.69

• 34.88

If you have salt, water and a plastic cup, which of the following correctly labels the role of each in making a solution?

• Salt=Solvent, Water=System, Plastic cup= Solute

• Salt=System, Water=Solute, Plastic cup= Solvent

• Salt=Solvent, Water=Solute, Plastic cup= System

• Salt=Solute, Water=Solvent, Plastic cup=System

Which of the following solutions has the highest concentration?

• Two grams of salt in two liters of water

• Two grams of salt in three liters of water

• Three grams of salt in two liters of water

• Three grams of salt in one liter of water

Label the following as either Brownian movement or the Tyndall effect. (Image of particles in random motion and light scattering through a colloid)

• Brownian movement

• Tyndall effect

What type of colloid is a pearl?

• Liquid material dispersed in liquid

• Solid material dispersed in solid

• Solid material dispersed in gas

• Gas material dispersed in liquid

A mixture of two or more immiscible liquids is called a/an __________.

• Solution

• Heterogeneous mixture

• Emulsion

• Emulsifier

Which type of colloid remains in a thickened state for an extended period of time?

• Temporary

• Semi-permanent

• Permanent

Fill in the blank: A vinaigrette is an example of a _______ emulsion.

• A) Permanent

• B) Semi-permanent

• C) Temporary