Section 12.5- Colloids Flashcards
containing tiny clumps or particles that remain suspended within the mixture is called a
colloidal dispersion or a colloid
colloids do not have a solvent or a solute, they have a
dispersing medium and dispersed substance
nothing gets __________________- in a colloid
dissolved
phenomenon that occurs because the clumps or particles scatter light passing through the mixture
Tyndall effect
the Tyndall effect does not occur in ______________________
true solutions
because of their small size, colloidal particles provide visible proof of the
kinetic theory of matter
the random movement of colloidal particles that serves to keep the particles suspended
Brownian motion
a colloid _________________ light q
scatters
the attraction of a substance to the surface of a solid
aDsorption
since the particles of a given colloid become like-charge by _________________ ions of only of one charge, they tend to repel each other
adsorbing
one important factor involved in the formation of river deltas is the
charged nature of colloidal particles
an example of colloidal suspension of solid particles in air
smoke
smoke may be precipitated from air by a device known as an
electrostatic precipitator or Cottrell precipitator
there are _________________ possible colloids
8
a gas dispersed in a liquid
foam
gas dispersed in a solid
solid foam
a liquid dispersed in a gas
liquid aerosol (hair spray)
liquid dispersed in a liquid
emuslion
liquid dispersed in a solid
solid emulsion
solid dispersed in a gas
solid aerosol and aerogel
solid dispersed in a liquid
sol or ger
solid dispersed in a solid
solid sol
a substance that stabilizes an emulsion by forming a protective layer on the surface of each particle
emulsifier
properties of true solutions
- particles do not settle out
- Particles pass unchanged through ordinary filter paper
- Particles pass unchanged through a semipermeable membrane
- particles do NOT scatter light
properties of colloids
- Particles do NOT settle out
- Particles pass unchanged though ordinary filter paper
- Particles are separated by a semipermeable membrane
- particle scatter light (Tyndall effect)
properties of suspensions
- Particles settle out on standing
- Particles are separated by ordinary filter paper
- Particles are separated by a semipermeable membrane
- Particles scatter light
sols that set to a jellylike form by the linking together of suspended particles are known as
gels
a sodium or potassium salt of a fatty acid
soap
a common soap
sodium stearate
the nonpolar end of a soap
dissolves in the grease or oil
the polar ends of soap stick out after the nonpolar side dissolves and act to
emulsify the grease or oil
soap _________________ dissolve oil or grease
does NOT
tiny, spherically shaped emulsified droplets of grease or oil suspended in the water are
micelles
do not form insoluble compounds in hard water and are usually used as substitutes for soap
detergents
digestion of fats (insoluble in water) in our bodies is hastened by the action of soaplike molecules known as
substances composed of molecules having a nonpolar end and a polar end
bile and bile salts
