(Finals) PhyPharm Lec Quiz 1

Question 1

The boundary that exists between two
phases.

Answer 1

Interface

Question 2

The properties of the molecules forming the
interface are often sufficiently different from those in the bulk of
each phase that they are referred to as
forming an

Answer 2

Interfacial phase

Question 3

Complete

Separate phases; _________________
Boundary; ________________

Answer 3

Bulk phases
Interfacial phases

Question 4

refers to the force between liquids-vapor and solid-vapor.

Answer 4

Surface tension

Involves vapor/gas as one of the bulk/phases

Question 5

refers to the force between 2 liquids, between 2 solids and between liquid-solid interface.

Answer 5

Interfacial tension

Between 2 liquids, solids, or liquid and a solid

Question 6

A phenomenon where the added molecules are partitioned in FAVOR OF THE INTERFACE

Answer 6

Positive adsorption

Question 7

A phenomenon where the added molecules are partitioned in FAVOR OF THE BULK

Answer 7

Negative adsorption

Question 8

Example of Positive Adsorption

Answer 8

Surface Active Agents (SAA’s)

Question 9

Example of Negative Adsorption

Answer 9

NaCl electrolyte and water

Question 10

Surface Active Agents AKA?

Answer 10

Surfactants or Amphiphilic molecules (amphiphiles)

Question 11

They are classified to be wetting agents that lowers the surface tension of a liquid, allows easier spreading, and lowers the interfacial tension between two liquids.

Answer 11

SURFACE ACTIVE AGENTS

Question 12

Surface active agents lower what?

Answer 12

Lowers the surface tension of a liquid

which ALLOWS EASIER SPREADING

Lowers the interfacial tension between two liquids

Question 13

3 Main Properties of Surfactants

Answer 13

1. are Surface Active Agents
2. are Emulsifying agents
3. reduce Surface tension

Question 14

What is the head of the surfactant? Hydrophilic/Hydrophobic?

Answer 14

Hydrophilic

Question 15

What is the tail of the surfactant? Hydrophilic/Hydrophobic?

Answer 15

Hydrophobic

Question 16

something that brings two things together that do not come together, under normal circumstances.

Answer 16

Emulsifying agents

Question 17

When surfactants are added to water, they rush to the surface because?

Answer 17

They are surface active agents

Question 18

Hydrophile-Lipophile Balance (HLB) is devised by who

Answer 18

Griffin

Question 19

the ratio of the weight percentages of the hydrophilic and hydrophobic groups in an emulsifier.

Answer 19

Hydrophile-Lipophile Balance (HLB)

Question 20

Low contact angle

Answer 20

Good wetting

Question 21

Higher contact angle

Answer 21

Bad wetting

Question 22

Surface Active Agents can be these 3, what are these 3?

Answer 22

Anion (-)
Cationic (+)
Non-ionic (0)

Question 23

What are the 6 different kinds of surfactants?

Answer 23

1. Solubilizing Agents
2. Detergents
3. O/W Emulsifying agents
4. Wetting and Spreading Agents
5. Oil in Water Emulsifying Agents
6. Most Antifoaming Agents

Question 24

Emulsifiers with HLB Value: below 9

Answer 24

lipophilic

Question 25

Emulsifiers with HLB Value: between 11 and 20

Answer 25

hydrophilic

Question 26

Emulsifiers with HLB Value: betweem 9 and 11

Answer 26

intermediates

Question 27

As the solubility of an emuslfieir in water increases, the HLB value?

Answer 27

Increases

Question 28

The OIL PHASE of an O/W emulsion requires a specific HLB, called the

Answer 28

Required hydrophile-lipophile balance, RHLB.

Question 29

True or False: RHLB can be used to form W/O emulsion from the same oil phase

Answer 29

False

A different RHLB is required to form W/O emulsion from the same oil phase.