Lecture 7 Dosage 1

Colloidal particles are subjected to random collision with molecules of the dispersion medium (solvent) so each particle move in irregular and complicated zigzag pathway. This is known as:

• Osmotic pressure

• Brownian motion

• Diffusion

• None of the above

.....is a name for the behaviour of charged particles near a semi-permeable

membrane that sometimes fail to distribute evenly across the two sides of the membrane.

• Brownian motion

• Donnan membrane effect

• Electrophoresis

• Diffusion

An amino acid will charry a ... charge when placed in an acidic medium

• Positive

• Negative

• Both positive and negative

• No charge

Lyophilic colloids are stabilized by the presence of solvent sheath

• True

• False

......is defined as the difference in potential between the surface of the tightly bound layer (shear plane) and the electro-neutral region of the solution

• Zeta potential

• Surface potential

• Stern potential