Colloids

Question 1

Define colloids

Answer 1

Dispersion of small particles of one material into another
=> highly curved surfaces
=> SA:V ratio very large

Question 2

Give techniques used to detect colloids

Answer 2

Detected by light scattering, sedimentation and osmosis

Question 3

Define Sol

Answer 3

dispersion of solid in liquid,

dispersion of solid in solid

Question 4

Define Aerosol

Answer 4

dispersion of liquid in gas e.g. fog,

dispersion of solid in gas e.g. smoke

Question 5

Define emulsion

Answer 5

dispersion of liquid in liquid e.g. milk

Question 6

Define lyophilic

Answer 6

Solvent attracting

Question 7

Define lyophobic

Answer 7

Solvent repelling