DD Exam 3: Comprehensive Questions and Review
Guide
in a dispersion, particle constituting the dispersed phase are distributed throughout a dispersion
medium. This is known as the discontinuous phase
a. true
b. false - correct answer ✔✔b (continuous phase)
the three types of dispersed systems include:
a. molecular dispersion
b. colloidal dispersion
c. coarse dispersion
d. mixture
e. a, b, c - correct answer ✔✔e
a molecular dispersion is a true solution and particles of molecular dimensions
a. true
b. false - correct answer ✔✔a
which of the following sizes falls under the molecular phase?
a. 1 nm - 500 nm
b. 1 m
c. less than 1 nm
d. greater than 0.5um - correct answer ✔✔c
which of the following falls under the coarse phase?
a. 1 nm - 500 nm
b. 1 m
,c. less than 1 nm
d. greater than 0.5 um - correct answer ✔✔d
which of the following falls under the colloidal dispersion?
a. 1 nm - 500 nm
b. 1 m
c. less than 1 nm
d. greater than 0.5 um - correct answer ✔✔a
examples of this type of dispersed system includes milk, micelle, foam, micro or nano-emulsions
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
which of the following is invisible in electron microscope?
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔b
which of the following is not resolved by ordinary microscope but MAY be detected under
ultramicroscope?
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
,true or false: colloidal dispersions can pass through an ultrafilter and semipermeable membrane -
correct answer ✔✔false; molecular dispersions
which of the following can undergo rapid diffusion?
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔b
examples include gains of sand, most pharmaceutical emulsions and suspensions, red blood cells
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔a
true or false: colloidal dispersions ARE visible under electron microscope - correct answer ✔✔true
passes through filter paper but NOT semipermeable membrane and diffuse slowly
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
true or false: coarse dispersions can pass through normal filter paper as well as dialyze through semi-
permeable membrane - correct answer ✔✔false
true or false: coarse dispersions do not diffuse - correct answer ✔✔true
includes silver sold, natural and synthetic polymers, cheese, butter, jelly, paint milk, shaving cream, and
microemulsiosn
, a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
which of the following does the shape of colloidal particles affect?
a. sedimentation
b. flow
c. osmotic pressure
d. pharmacological action
e. it has no effect
f. a, b, c, d, - correct answer ✔✔f
colligative properties - correct answer ✔✔properties that depend on the concentration of solute
particles but not on their identity
true or false: osmotic pressure is a colligative property - correct answer ✔✔true
dispersion medium + dispersed phase = colloid type
solid + liquid = - correct answer ✔✔solid emulsion
dispersion medium + dispersed phase = colloid type
solid + solid = - correct answer ✔✔solid sol
dispersion medium + dispersed phase = colloid type
___ + ___ = emulsion - correct answer ✔✔liquid, liquid
dispersion medium + dispersed phase = colloid type
solid + gas = - correct answer ✔✔solid foam
Guide
in a dispersion, particle constituting the dispersed phase are distributed throughout a dispersion
medium. This is known as the discontinuous phase
a. true
b. false - correct answer ✔✔b (continuous phase)
the three types of dispersed systems include:
a. molecular dispersion
b. colloidal dispersion
c. coarse dispersion
d. mixture
e. a, b, c - correct answer ✔✔e
a molecular dispersion is a true solution and particles of molecular dimensions
a. true
b. false - correct answer ✔✔a
which of the following sizes falls under the molecular phase?
a. 1 nm - 500 nm
b. 1 m
c. less than 1 nm
d. greater than 0.5um - correct answer ✔✔c
which of the following falls under the coarse phase?
a. 1 nm - 500 nm
b. 1 m
,c. less than 1 nm
d. greater than 0.5 um - correct answer ✔✔d
which of the following falls under the colloidal dispersion?
a. 1 nm - 500 nm
b. 1 m
c. less than 1 nm
d. greater than 0.5 um - correct answer ✔✔a
examples of this type of dispersed system includes milk, micelle, foam, micro or nano-emulsions
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
which of the following is invisible in electron microscope?
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔b
which of the following is not resolved by ordinary microscope but MAY be detected under
ultramicroscope?
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
,true or false: colloidal dispersions can pass through an ultrafilter and semipermeable membrane -
correct answer ✔✔false; molecular dispersions
which of the following can undergo rapid diffusion?
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔b
examples include gains of sand, most pharmaceutical emulsions and suspensions, red blood cells
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔a
true or false: colloidal dispersions ARE visible under electron microscope - correct answer ✔✔true
passes through filter paper but NOT semipermeable membrane and diffuse slowly
a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
true or false: coarse dispersions can pass through normal filter paper as well as dialyze through semi-
permeable membrane - correct answer ✔✔false
true or false: coarse dispersions do not diffuse - correct answer ✔✔true
includes silver sold, natural and synthetic polymers, cheese, butter, jelly, paint milk, shaving cream, and
microemulsiosn
, a. coarse
b. molecular
c. colloidal
d. mixture - correct answer ✔✔c
which of the following does the shape of colloidal particles affect?
a. sedimentation
b. flow
c. osmotic pressure
d. pharmacological action
e. it has no effect
f. a, b, c, d, - correct answer ✔✔f
colligative properties - correct answer ✔✔properties that depend on the concentration of solute
particles but not on their identity
true or false: osmotic pressure is a colligative property - correct answer ✔✔true
dispersion medium + dispersed phase = colloid type
solid + liquid = - correct answer ✔✔solid emulsion
dispersion medium + dispersed phase = colloid type
solid + solid = - correct answer ✔✔solid sol
dispersion medium + dispersed phase = colloid type
___ + ___ = emulsion - correct answer ✔✔liquid, liquid
dispersion medium + dispersed phase = colloid type
solid + gas = - correct answer ✔✔solid foam
