Chemical Equilibrium

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1. What is a reverse osmosis?

  • Filtration of solution using external pressure through semipermeable membrane which can retain solute so a pure solution can be obtained
  • Is the hydrostaic pressure by difference in water potential. It is the osmotic flow of a solvent from high concentration to low concentration though semi permeable membrane.
  • Colloid osmotic pressure (osmotic pressure of a colloid solution eg. cytosol, blood plasma)
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2. Which of these do not affect equilibrium?

  • Catalyst
  • Temperature
  • Pressure (if moles differ in products and reactants)
  • Concentration

3. Which of these statements about equilibrium constant is not true?

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

4. What is the equation for ionic strenght?

  • I= 0.5 (sum of the conc of ions and (charge of ions)^2)
  • aB =YB(activity coefficient) x ConcB
  • RTc
  • 1000RTc

5. When th reaction Quotient and rate constant is compared it is used to determine?

  • The spontaneity of a chemical reaction.
  • The direction of the reaction
  • expresses the energy that can be converted during chemical reaction to useful (non pressure volume) work.

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