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PMP102 > Disperse Systems - ALL NOTES > Flashcards

Disperse Systems - ALL NOTES Flashcards

1
Q

What are the features of a solution?

A

-Mono-phase system
-Molecular dispersion
-Cannot be filtered
-Do not scatter light

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2
Q

What is disperse system?

A

-One phase distributed in a disperse phase
-Two immiscible phases in contact

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3
Q

What is a colloid?

A

-A two phase mixture of matter intermediate between homogenous and heterogenous mixture
-Small droplets of one substance dispersed in another

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4
Q

What is the Tyndall effect?

A

-The scattering of light by colloidal particles

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5
Q

What are the properties of colloids?

A

-Tyndall effect
-brownian motion
-adsorption
-electrophoresis

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6
Q

What is Brownian motion?

A

-The bombardment of smaller molecules on larger molecules which keep them in suspension in the liquid

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7
Q

What is adsorption?

A

-The process in which material travels from a liquid or gas phase and forms a superficial monomolecular layer on the solid phase

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8
Q

What is dialysis?

A

-Separation of suspended colloidal particles from dissolved ions or molecules of small dimensions through pores of semi-permeable membranes

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9
Q

What is electrophoresis?

A

-The migration of charged particles under the influence of an electric field

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10
Q

What is thixotropy?

A

-Viscous fluids will become flexible and flow when agitated and return to more gelatinous state after static period

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11
Q

What are the types of colloids?

A

-Lyophobic nd lyophilic

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12
Q

What is lyophilic ?

A

-Solvent loving

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13
Q

What is lyophobic?

A

-Solvent hating

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14
Q

What is the difference between a solution and colloidal dispersion?

A

-A solution is always a liquid whereas a colloidal dispersion can exist in different phases

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15
Q

what is a sol?

A

-A colloidal dispersion of a solid dispersed in a liquid

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16
Q

What is a gel?

A

-A colloidal system in which the liquid medium has become viscous enough to behave like a solid

17
Q

What is a foam?

A

-A gas dispersed in liquid

18
Q

How do defamers work?

A

-Foam breakers that displace surfactants at the air-water interface

19
Q

What is surface tension?

A

-A measure of how difficult it is to stretch or break the surface of a liquid

20
Q

What is a surfactant?

A

-A substance that reduces surface tension that consists of hydrophobic and hydrophilic regions

21
Q

What is a cationic surfactant ?

A

-Positively charged surfactant, negative counter ion

22
Q

What is a non-ionic surfactant?

A

-Uncharged surfactant

23
Q

What is a zwitterion?

A

-A zwitterion is a species with both a positive and a negative charge but an overall neutral charge

24
Q

Why is a co-surfactant sometimes added?

A

-To achieve very low surface tension

25
Q

What is a micelle?

A

-Colloidal spherical nanoparticles that constantly breaking down and reforming

PMP102 (20 decks)

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