Which of the following statements about foams is correct?

Foams are formed by trapping gas in liquid films.

Foams are always unstable regardless of composition.

Foams are only found in food products.

Foams do not require surfactants or proteins for stabilization.

Which of the following best describes an aerosol?

A solid or liquid dispersed in a gas

Which characteristic is unique to colloids and not found in true solutions?

Cannot be separated by filtration

Which of the following are properties of colloids?

Can be separated by ultrafiltration

Large surface area to volume ratio

Particles visible to the naked eye

Which of the following is NOT a recent advancement in colloidal science?

Colloidal silver in traditional medicine

Nanoparticle-based drug delivery systems

Colloidal quantum dots for display technology

Smart windows with tunable optical properties

In the context of smart windows with tunable optical properties, what role does water play during winter as depicted in the diagram?

It acts as an insulating layer to reduce heat loss.

It increases heat loss through the window.

It absorbs sunlight to warm the room.

It reflects all sunlight away from the window.

💡 Which statement best describes a kinetically stable colloid?

It remains dispersed because particles are prevented from aggregating by repulsive forces.

It remains dispersed because the dispersed state is energetically favorable.

It will spontaneously separate into two phases over time.

It has the lowest possible energy state.

💡 Which of the following is true for a thermodynamically stable system?

The colloidal state exists because it is the lowest energy configuration.

It requires continuous agitation to prevent settling.

It remains stable only if no electrolytes are added.

The dispersed particles remain stable because of high activation energy barriers.

Why do the tiny particles suspended in a fluid move in a zig-zag/random path as seen in the video?

Because they receive continuous jolts from molecules of the fluid surrounding them

Because gravity is pulling them down unevenly

Because they are attracted to one another and keep bumping into each other

Because the fluid is in motion (convection) rather than being still

According to DLVO theory, a colloid remains stable when…

Electrostatic repulsion is greater than attraction

What happens when you add a large amount of electrolyte to a colloid that is electrostatically stabilized?

The electrical double layer is compressed, reducing repulsion and causing coagulation

The particles gain more charge and become more stable

The electrical double layer expands and prevents coagulation

Nothing changes — electrolytes have no effect

Why do emulsions stabilized by polymers or surfactants remain stable even after adding electrolytes?

The polymer chains form a physical barrier that prevents particle contact

The electrostatic repulsion increases

The electrolyte increases the zeta potential

The particles lose all surface charge

BWK20403 PART I

Interactive Video

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Chemistry

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University

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Practice Problem

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NURUN NAJWA BINTI RUSLAN NURUN NAJWA BINTI RUSLAN

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74 questions

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SLIDE QUESTION

30 sec • Ungraded

SLIDE QUESTION

30 sec • Ungraded

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are colloids important in everyday life and industry?

They are only found in laboratories

They have unique properties useful in many products and processes

They are dangerous and should be avoided

They are the same as solutions

SLIDE QUESTION

30 sec • Ungraded

SLIDE QUESTION

30 sec • Ungraded

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a key property that distinguishes a colloid from a true solution and a suspension?

Colloids have particles that are evenly dispersed and do not settle out.

Colloids have the largest particle size among mixtures.

Colloids are always transparent.

Colloids cannot be found in food products.

SLIDE QUESTION

30 sec • Ungraded

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BWK20403 PART I

74 questions

Why are colloids important in everyday life and industry?

Which of the following is a key property that distinguishes a colloid from a true solution and a suspension?

A sol is a type of colloid where (a) particles are dispersed in a liquid medium.

Which of the following are examples of sols?

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