Surfactants and Foam Separations Quiz

What term describes a molecule that has both hydrophobic and hydrophilic parts?

• Solvent

• Surfactant

• Soluble

• Solute

In foam separation processes, what is the role of a surfactant?

• To increase the boiling point of the solution

• To act as a surface-active agent that adsorbs at the air-liquid interface

• To reduce the viscosity of the solution

• To act as a catalyst

Which of the following is NOT a factor affecting the formation and adsorption of the complex at the bubble surface?

• The pH of the solution

• The ambient temperature

• The color of the solution

• The ionic strength of the solution

Foam fractionation is used to separate what type of species from a solution?

• Insoluble

• Soluble

• Non-reactive

• Solid

In foam separation, the driving force for mass transfer of the surface-active solute is the:

• Difference in pH between two phases

• Difference in concentration between the phases

• Similarity in temperature between the phases

• Equal density of the phases

Which adsorption isotherm expression might be used to model adsorption equilibrium?

• Boyle's Law

• Charles's Law

• Langmuir

• Dalton's Law

What is the common phase that carries the species being adsorbed in foam separation?

• Oil

• Water

• Gas

• Vacuum

What phenomenon occurs when the surfactant concentration in the continuous phase is too high during foam separation?

• Boiling

• Sublimation

• Micelle formation

• Precipitation

In continuous foam separation operations, what happens to the overhead product?

• It is discarded.

• It is drawn off at the top of the column.

• It is recycled back into the liquid pool.

• Both B and C are correct.

Which of the following is not a practical application of foam separation techniques?

• Purifying drinking water

• Separating proteins in biotechnology

• Cooking and food preparation

• Mineral processing in the mining industry