Lec.6 Eman

Question 1

Partition knowledge provides an idea about:
a) The boiling point of solvents
b) The solubility of substances
c) The viscosity of liquids
d) The density of solutions

Answer 1

b) The solubility of substances

Question 2

Solvent extraction relies on:
a) Partitioning of solvents between two immiscible phases
b) Filtration of solvents through a membrane
c) Chemical reactions between solvents and solutes
d) Electrostatic interactions between solvents and solutes

Answer 2

a) Partitioning of solvents between two immiscible phases

Question 3

Partition knowledge is important for the preservation of oil-water systems because:
a) It helps maintain the stability of emulsions
b) It regulates the pH of the system
c) It prevents microbial growth
d) It improves the taste of the mixture

Answer 3

a) It helps maintain the stability of emulsions

Question 4

The partitioning of drugs between aqueous phases and lipid biophases is important because:
a) It affects the therapeutic efficacy of the drugs
b) It determines the color of the drugs
c) It influences the chemical stability of the drugs
d) It regulates the drug’s half-life in the body

Answer 4

a) It affects the therapeutic efficacy of the drugs

Question 5

Partition knowledge is relevant to the absorption and distribution of drugs throughout the body because:
a) It determines the rate of drug elimination
b) It affects the drug’s mechanism of action
c) It determines the drug’s bioavailability
d) It influences the drug’s molecular weight

Answer 5

c) It determines the drug’s bioavailability

Question 6

Chromatography utilizes partitioning between a stationary phase and a mobile phase to separate components. True or False?

Answer 6

True

Question 7

Liquid-liquid extraction is a method used to:
a) Separate components of a mixture
b) Convert liquids into gases
c) Combine liquids into a homogeneous solution
d) Precipitate solids from a liquid solution

Answer 7

a) Separate components of a mixture

Question 8

What is the key requirement for liquid-liquid extraction to be successful?
a) The liquids must be miscible with each other
b) The liquids must have similar densities
c) The liquids must have different boiling points
d) The liquids must be immiscible with each other

Answer 8

d) The liquids must be immiscible with each other

Question 9

The solubility differences between solvents in liquid-liquid extraction are quantified by:
a) Distribution coefficient
b) Extraction ratio
c) Separation factor
d) Partition coefficient

Answer 9

d) Partition coefficient

Question 10

In the extraction of sugar from vegetable oil, which solvent is added to facilitate the separation?
a) Alcohol
b) Acetone
c) Water
d) Hexane

Answer 10

c) Water