Chemical Equilibrium

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1. Which of these is not used to classify a dispersion system?

  • Coarse dispersion system DP>1000 nm (eg. suspensions, emulsions)
  • Analytic dispersion system (true solutions) DP
  • Stable system DP>1000 nm (eg. solids)
  • Colloid system (colloids) DP= 1-1000 nm (eg. macromolecules, nanoparticles)
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2. Which of these statements about equilibrium constant is not true?

  • if K>1 Reactants prevails products (if K is very low reaction may not occur)
  • Kc is dimensionless
  • if K>1 products prevails reactants (if K is very high then it maybe irreversible
  • Kc = [C}^c[D]^d divided by [A]^a[B]^b

3. Differences between osmolarity and osmolaity?

  • Osmolarity = mol/kg
  • osmolality= mol/kg

4. Dispersion systems. Which is Incorrect?

  • 2 types: Homogenous (eg emulsion, suspension foam) and heterogenous (eg. solution, mixtures of gases, alloys)
  • Systems in which the particles of a dispersed phase are dispersed in a dispersing medium
  • 2 types: Homogenous( eg solution, mixtures of gases, alloys) and heterogenous ( eg.emulsion, suspension foam )

5. What does the increasing ionic strenght mean?

  • This increases the activity coefficient and increases the difference between activity and conc (a
  • This decreases the activity coefficient and increases the difference between activity and conc (a
  • This decreases the activity coefficient and decreases the difference between activity and conc (a

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