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Conditions For Equilibrium (Grade 10)

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Conditions For Equilibrium

1. 
Which statement correctly compares the rates of forward and reverse reactions at equilibrium?
  1. The rates are constant
  2. The rates are equal
  3. The rate of the reverse reaction is less than that of the forward reaction
  4. Both (a) and (b)
 
2. 
Which statement correctly describes the concentrations of reactants and products at equilibrium?
  1. The concentrations of reactants and products are equal
  2. The concentrations of the reactants are greater
  3. The concentrations of the products are greater
  4. The concentrations are constant
3. 
Which of the following conditions is always required for equilibrium?
  1. Concentrations to be zero
  2. Concentrations of both products and reactants to be increasing
  3. A closed system
  4. An irreversible process
 
4. 
Which of the following kinds of changes can reach equilibrium?
  1. Phase changes
  2. Chemical reactions
  3. Dissolving of a solute
  4. All of the above
5. 
Which two processes are involved in the phase equilibrium between a solid and a liquid?
  1. Melting and Evaporation
  2. Evaporation and Condensation
  3. Sublimation and Deposition
  4. Melting and Freezing
 
6. 
Which two processes are involved in the solution equilibrium between solid NaCl and aqueous NaCl?
  1. Dissolving and evaporation
  2. Dissolving and crystallization
  3. Evaporation and crystallization
  4. Dissolving and melting
7. 
Which statement correctly describes what occurs BEFORE equilibrium is established in a chemical reaction?
  1. The concentrations of both the products and the reactants decrease
  2. The concentrations of both the products and the reactants increase
  3. The concentrations of the products increase, and the concentrations of the reactants decrease
  4. The concentrations of the products decrease, and the concentrations of the reactants increase
 
8. 
Which term correctly describes a solution that is at equilibrium with the solid form of the solute?
  1. Unsaturated
  2. Supersaturated
  3. Saturated
  4. None of the above
9. 
The                                    of the liquid and gas forms of [math]H_2O[/math] each remain constant in the case of a phase equilibrium.
 
10. 
A process at equilibrium can be irreversible.
  1. True
  2. False
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