Section 12.5- Colloids

Question 1

containing tiny clumps or particles that remain suspended within the mixture is called a

Answer 1

colloidal dispersion or a colloid

Question 2

colloids do not have a solvent or a solute, they have a

Answer 2

dispersing medium and dispersed substance

Question 3

nothing gets __________________- in a colloid

Answer 3

dissolved

Question 4

phenomenon that occurs because the clumps or particles scatter light passing through the mixture

Answer 4

Tyndall effect

Question 5

the Tyndall effect does not occur in ______________________

Answer 5

true solutions

Question 6

because of their small size, colloidal particles provide visible proof of the

Answer 6

kinetic theory of matter

Question 7

the random movement of colloidal particles that serves to keep the particles suspended

Answer 7

Brownian motion

Question 8

a colloid _________________ light q

Answer 8

scatters

Question 9

the attraction of a substance to the surface of a solid

Answer 9

aDsorption

Question 10

since the particles of a given colloid become like-charge by _________________ ions of only of one charge, they tend to repel each other

Answer 10

adsorbing

Question 11

one important factor involved in the formation of river deltas is the

Answer 11

charged nature of colloidal particles

Question 12

an example of colloidal suspension of solid particles in air

Answer 12

smoke

Question 13

smoke may be precipitated from air by a device known as an

Answer 13

electrostatic precipitator or Cottrell precipitator

Question 14

there are _________________ possible colloids

Answer 14

8

Question 15

a gas dispersed in a liquid

Answer 15

foam

Question 16

gas dispersed in a solid

Answer 16

solid foam

Question 17

a liquid dispersed in a gas

Answer 17

liquid aerosol (hair spray)

Question 18

liquid dispersed in a liquid

Answer 18

emuslion

Question 19

liquid dispersed in a solid

Answer 19

solid emulsion

Question 20

solid dispersed in a gas

Answer 20

solid aerosol and aerogel

Question 21

solid dispersed in a liquid

Answer 21

sol or ger

Question 22

solid dispersed in a solid

Answer 22

solid sol

Question 23

a substance that stabilizes an emulsion by forming a protective layer on the surface of each particle

Answer 23

emulsifier

Question 24

properties of true solutions

Answer 24

1. particles do not settle out
2. Particles pass unchanged through ordinary filter paper
3. Particles pass unchanged through a semipermeable membrane
4. particles do NOT scatter light

Question 25

properties of colloids

Answer 25

1. Particles do NOT settle out 2. Particles pass unchanged though ordinary filter paper 3. Particles are separated by a semipermeable membrane 4. particle scatter light (Tyndall effect)

Question 26

properties of suspensions

Answer 26

1. Particles settle out on standing 2. Particles are separated by ordinary filter paper 3. Particles are separated by a semipermeable membrane 4. Particles scatter light

Question 27

sols that set to a jellylike form by the linking together of suspended particles are known as

Answer 27

gels

Question 28

a sodium or potassium salt of a fatty acid

Answer 28

soap

Question 29

a common soap

Answer 29

sodium stearate

Question 30

the nonpolar end of a soap

Answer 30

dissolves in the grease or oil

Question 31

the polar ends of soap stick out after the nonpolar side dissolves and act to

Answer 31

emulsify the grease or oil

Question 32

soap _________________ dissolve oil or grease

Answer 32

does NOT

Question 33

tiny, spherically shaped emulsified droplets of grease or oil suspended in the water are

Answer 33

micelles

Question 34

do not form insoluble compounds in hard water and are usually used as substitutes for soap

Answer 34

detergents

Question 35

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

Answer 35

bile and bile salts