Other questions in this quiz

2. which is not true?

  • Thin layer chromatography - separates substances with different affinity to 2 phases (staionary and mobile phase)
  • surfactants are compounds that increase surface tension (adhesive and cohesive forces)
  • there are 4 types of surfactants - anion, cationic, amphoteric, non ionic
  • when the monomer conc > CMC then a micelle is formed

3. Which of these will increase stabilization of a colloid particle?

  • Adding the ionic strength by adding
  • Adding water soluble organic solvent (destroys the lyosphere)
  • Add a little salt (eg. increases solubility of globulins)
  • Changing the Ph to its isoelectric point for amphoteric colloid particles like proteins

4. what is a protective colloid?

  • A protective colloid are substances that form a hydrophilic colloid solution stabilizing the hydrophobic colloid particles.
  • proteins in the blood are protective colloids of Calcium phosphate and calcium carbonate leading to its precipitation (forming gall stones)
  • A protective colloid are substances that form a hydrophobic colloid solution stabilizing the hydrophillic colloid particles.
  • A stubstance that specifically stabilises emulsions eg glycocholic (facilate absorption of dietary lipids)

5. which of these is not a feature of a colloid?

  • Optical feature: Opalescent
  • > 500nm
  • settles by ultracentrifugation - cannot use filtration
  • Allows dialysis
  • Contributes to the oncotic pressure
  • Because of their large size- they can induce light diffusion
  • Can be seen by electric microscope
  • Can be separated by electrophoresis because they often carry a charge

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all colloids resources »