PART PART 3

Question 1

Adsorption of gas is infinite

Answer 1

Freundlich Isotherm

Question 2

Limited Adsorption

Answer 2

Langmuir Isotherm

Question 3

Measures the maximum pull on the ring by the surface

Answer 3

Du nouy

Question 4

Measure equilibrium surface or interfacial tension

Answer 4

Wilhelmy plate

Question 5

Based on the shape of the drop.

Answer 5

Pendant Drop

Question 6

Based on the pressure

Answer 6

Bubble Pressure

Question 7

Based on the size of the drops.

Answer 7

Volumetric Tensiometers

Question 8

MEASURING SURFACE AREA Method 1

Answer 8

Adsorption method

Question 9

MEASURING SURFACE AREA method 2

Answer 9

Air-permeability Method

Question 10

this instrument is generally used for surface area determination by gas adsorption and air permeability method.

Answer 10

Quantasorb

Question 11

is a surfactant that when dissolved in water, lowers the advancing contact angle and aids in displacing an air phase at the surface and replacing it with a liquid phase.

Answer 11

Wetting agent

Question 12

It is a system in which particles of colloidal size (1 nanometer to 0.5 micrometer) are dispersed in a continuous phase of different compositions.

Answer 12

Colloidal dispersion

Question 13

ability to scatter or to dispersed light, formation of cone

Answer 13

Faraday Tyndall Effect

Question 14

random collisions of particles
resulting to irregular zigzag path (random movement)

Answer 14

Brownian motion

Question 15

spontaneous movement of the
particles from a region of higher concentration to one lower concentration until the concentration of the system is uniform throughout. (Along the concentration gradient)

Answer 15

Diffusion

Question 16

Difference between the potential of the actual surface and the electroneutral region of the surface. (Usually for engineering)

Answer 16

Nerst potential

Question 17

Difference between the potential of the surface of the tightly bound layer and the electroneutral region of the surface.

Answer 17

Zeta potential

Question 18

Nerst potential AKA

Answer 18

Electrothermodynamic potential

Question 19

Zeta potential AKA

Answer 19

Electrokinetic potential

Question 20

The protective property is expressed most frequently in terms of

Answer 20

Gold number

Question 21

It is the minimum weight in milligrams of the protective colloid (dry weight of dispersed phase) required to prevent a color change fromredtovioletin10mLofagoldsolonthe addition of 1 mL of a 10% solution of sodium chloride.

Answer 21

gold number

Question 22

charged particle is moving, water is stationary

Answer 22

Electrophoresis

Question 23

water is moving, charged particle is stationary

Answer 23

Electro-osmosis

Question 24

The reverse of electrophoresis is the creation of potential when particles undergo sedimentation.

Answer 24

Sedimentation Potential

Question 25

Differs from electro osmosis in that forcing a liquid to flow through a plug orbed of particles creates the potential

Answer 25

Streaming potential

Question 26

Emulsion Instability

Answer 26

Coalescence
Creaming
Cracking
Phase inversion

Question 27

Suspension instability

Answer 27

Aggregation
Sedimentation
Caking

Question 28

Semi solid instability

Answer 28

Synerensis
Swelling
Imbibition
Bleeding

Question 29

particles come together to make
globules resulting in the fus

Answer 29

Coalescence

Question 30

upward movement of the internal phase

Answer 30

Creaming

Question 31

total separation of phase

Answer 31

Cracking

Question 32

change in type of emulsion

Answer 32

Phase inversion

Question 33

reversible aggregation of particles

Answer 33

Aggregation

Question 34

downward movement of the particles

Answer 34

Sedimentation

Question 35

It is irreversible. This can lead into the
formation of a non resuspendable sediment.

Answer 35

Caking