Chemical Equilibrium

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

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

  • 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
  • if K>1 Reactants prevails products (if K is very low reaction may not occur)
  • Kc is dimensionless

3. Calculate osmatic pressure=RTc. Which is incorrect?

  • c= osmolality
  • R- gas constant
  • C= osmolarity
  • osmatic pressure= 1000RTc (Pa)

4. what is a colligative property of solutions definitions?

  • They are observed in diluted solution so its possible to stop interactions with particles which depend on chemical structure.
  • All of the above
  • It is the properties of the solutions that depend on the number of particles in a given volumn of solvent but not in chemical properties of the solvent

5. What does the increasing ionic strenght mean?

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

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