Disperse systems-dosage forms

Question 1

What is a solution?

Answer 1

A homogenous mixture where a solute is dissolved into a solvent

Question 2

What is molecular dispersion in solutions?

Answer 2

Its the even distribution of molecules throughout the solvent

Question 3

what type of particles do solutions contain?

Answer 3

Small particles, such as ions or molecules.

Question 4

Are solutions transparent or opaque?

Answer 4

transparent

Question 5

do solutions seperate over time?

Answer 5

no

Question 6

can solutions be filtered?

Answer 6

no

Question 7

can solutions scatter light?

Answer 7

no

Question 8

What is a disperse system?

Answer 8

A system where on phase (disperse phase) is distributed throughout a second phase (continuous phase or dispersant)

Question 9

What is the disperse phase in a disperse systems?

Answer 9

The phase that is distributed throughout another phase

Question 10

What is the continuous phase in a disperse system?

Answer 10

The phase in which the disperse phase is distributed, acting as a dispersant.

Question 11

How are the phases in a disperse system related in terms of miscibility?

Answer 11

They are immiscible, meaning they do not mix completely and remain in contact as seperate phases

Question 12

What is an example of a disperse system?

Answer 12

Oil droplets in water, where oil is the disperse phase and water is the continuous phase.

Question 13

What is a colloid or colloidal dispersion?

Answer 13

A two-phase system of matter, a type of mixture intermediate between homogeneous and heterogeneous mixtures with particle sizes less than 1 µm.

Question 14

How does a colloid compare to homogeneous and heterogeneous mixtures?

Answer 14

It is intermediate between homogeneous and heterogeneous mixtures.

Question 15

What is a phase colloid?

Answer 15

A colloid where small droplets or particles of one substance (the disperse phase) are dispersed in another substance (the continuous phase).

Question 16

What is a molecular colloid?

Answer 16

A colloid in which macromolecules are dispersed in a continuous phase.

Question 17

What is the typical particle size in colloids?

Answer 17

Less than 1 µm.

Question 18

What are the properties of colloids?

Answer 18

Tyndall effect
brownian motion
absortion
dialysis
electrophoresis
thixotropy

Question 19

What is the tyndall effect in relation to colloids?

Answer 19

Colloids scatter light, light beams path through colloid is visible due to light scatter

Question 20

What is the brownian motion?

Answer 20

Molecules of the liquid in motion, due to this larger particles of colloid are bombarded by smaller particles of the liquid. Motion of bombardment keeps colloid particles suspended.

Question 22

What is adorption?

Answer 22

A chemical is associated to the surface of a second agent, it is often reversible. It can lead to conformational change.