Colloids

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

  • Changing the Ph to its isoelectric point for amphoteric colloid particles like proteins
  • Add a little salt (eg. increases solubility of globulins)
  • Adding water soluble organic solvent (destroys the lyosphere)
  • Adding the ionic strength by adding
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2. 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)

3. What is dialysis?

  • the electrophoretic mobility of the particles depends on the size , ccharge and shape.
  • diffusion of small molecules and ions from the colloid across the dialysation membrane eg cellophane which is permeable to small molecules and not colloid perticlaes
  • The removal of waste products from the blood (purpose of an artificial kidney)

4. which of these is not a way to classify Colloids?

  • Organic colloids - colloid particles (eg DNA, viruses, vesicles) or colloid systems(- blood plasma, lymph, cytosol)
  • Mobility of coloids eg solutions (free in their motion as in a true solution) and gel (particles arranged in a solid net e.g fibrin gel, gelatine
  • Interaction with water - hydrophobic and hydrophillic
  • Structure of colloid - Molecular (sungle large molecule eg. proteins/starch) or micellar (particles composed from smaller amphillic ones eg. soap/phospholipids

5. which is not true?

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

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