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Colloid and Interface Science

Description: Colloid and Interface Science Quiz
Number of Questions: 15
Created by:
Tags: colloid science interface science surface chemistry
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What is the dispersed phase in a colloid?

  1. Solid

  2. Liquid

  3. Gas

  4. All of the above

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Correct Option: D
Explanation:

A colloid is a mixture of two or more substances, one of which is dispersed in the other in the form of small particles.

What is the continuous phase in a colloid?

  1. Solid

  2. Liquid

  3. Gas

  4. All of the above

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Correct Option: B
Explanation:

The continuous phase in a colloid is the phase in which the dispersed phase is dispersed.

What is the size range of particles in a colloid?

  1. 1-10 nm

  2. 10-100 nm

  3. 100-1000 nm

  4. All of the above

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Correct Option:
Explanation:

The size range of particles in a colloid is typically between 1 and 1000 nanometers.

What are the different types of colloids?

  1. Sol

  2. Gel

  3. Emulsion

  4. Foam

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Correct Option:
Explanation:

The different types of colloids include sols, gels, emulsions, and foams.

What is the difference between a sol and a gel?

  1. Sols are liquid, while gels are solid.

  2. Sols are transparent, while gels are opaque.

  3. Sols can flow, while gels cannot.

  4. All of the above

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Correct Option: D
Explanation:

Sols are liquid, transparent, and can flow, while gels are solid, opaque, and cannot flow.

What is the difference between an emulsion and a foam?

  1. Emulsions are mixtures of two immiscible liquids, while foams are mixtures of a gas and a liquid.

  2. Emulsions are opaque, while foams are transparent.

  3. Emulsions can flow, while foams cannot.

  4. All of the above

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Correct Option: D
Explanation:

Emulsions are mixtures of two immiscible liquids, opaque, and can flow, while foams are mixtures of a gas and a liquid, transparent, and cannot flow.

What are the applications of colloids?

  1. Food

  2. Cosmetics

  3. Pharmaceuticals

  4. All of the above

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Correct Option: D
Explanation:

Colloids are used in a wide variety of applications, including food, cosmetics, and pharmaceuticals.

What are the challenges in colloid science?

  1. Stability

  2. Aggregation

  3. Coagulation

  4. All of the above

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Correct Option: D
Explanation:

The challenges in colloid science include stability, aggregation, and coagulation.

How can the stability of a colloid be improved?

  1. Adding a stabilizer

  2. Increasing the particle size

  3. Decreasing the temperature

  4. All of the above

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Correct Option: D
Explanation:

The stability of a colloid can be improved by adding a stabilizer, increasing the particle size, and decreasing the temperature.

What is the DLVO theory?

  1. A theory that describes the stability of colloids

  2. A theory that describes the aggregation of colloids

  3. A theory that describes the coagulation of colloids

  4. All of the above

Show answer
Correct Option: D
Explanation:

The DLVO theory is a theory that describes the stability, aggregation, and coagulation of colloids.

What are the different types of surface forces?

  1. van der Waals forces

  2. Electrostatic forces

  3. Steric forces

  4. All of the above

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Correct Option: D
Explanation:

The different types of surface forces include van der Waals forces, electrostatic forces, and steric forces.

What is the Hamaker constant?

  1. A constant that describes the strength of van der Waals forces

  2. A constant that describes the strength of electrostatic forces

  3. A constant that describes the strength of steric forces

  4. None of the above

Show answer
Correct Option: A
Explanation:

The Hamaker constant is a constant that describes the strength of van der Waals forces.

What is the Debye length?

  1. The distance from a charged surface at which the electrostatic potential is reduced to 1/e of its value at the surface

  2. The distance from a charged surface at which the electrostatic potential is reduced to 1/2 of its value at the surface

  3. The distance from a charged surface at which the electrostatic potential is reduced to 1/4 of its value at the surface

  4. None of the above

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Correct Option: A
Explanation:

The Debye length is the distance from a charged surface at which the electrostatic potential is reduced to 1/e of its value at the surface.

What is the Stern layer?

  1. The layer of ions that is attracted to a charged surface

  2. The layer of ions that is repelled from a charged surface

  3. The layer of ions that is neutral

  4. None of the above

Show answer
Correct Option: A
Explanation:

The Stern layer is the layer of ions that is attracted to a charged surface.

What is the diffuse layer?

  1. The layer of ions that is repelled from a charged surface

  2. The layer of ions that is attracted to a charged surface

  3. The layer of ions that is neutral

  4. None of the above

Show answer
Correct Option: A
Explanation:

The diffuse layer is the layer of ions that is repelled from a charged surface.

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