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Lesson: Types of Equilibrium

Worksheet • 7 Questions


At the boiling point of a liquid, which of the following conditions is satisfied?

  • AVapor pressure equals atmospheric pressure.
  • BVapor pressure equals the liquid surface tension.
  • CThe rate of evaporation equals the rate of condensation.
  • DThe rate of evaporation equals the rate of convection.
  • EThe free energies of vaporization and condensation are equal in magnitude.


Heat is added to a block of ice in a bath of liquid water at 0 ∘ C . A student records the temperature of the ice 𝑇 and the mass of liquid water 𝑀 . The system remains at thermal equilibrium and ice remains at the end of the process. Which quantities do not change?

  • A 𝑇 only
  • BMore information is needed.
  • C 𝑀 only
  • DNeither 𝑀 nor 𝑇
  • EBoth 𝑀 and 𝑇


If a reaction is reversible, when can it be said to have reached equilibrium?

  • AWhen the rates of the forward and reverse reactions are equal.
  • BWhen the concentrations of the products are equal to the standard value, typically 1 M.
  • CWhen the reactants are fully consumed.
  • DWhen the concentrations of the reactants and products are equal.
  • EWhen the reactants and the products have equal concentrations.


Under standard conditions, a sealed container of bromine consists of a liquid phase in equilibrium with a gaseous phase. Why would it be impossible to establish an equilibrium between B r ( ) 2 l and B r ( ) 2 g if the container were not a closed?

  • AIn an open system, the rate of condensation is limited by diffusion of B r ( ) 2 g out of the container.
  • BIn an open system, the rate of condensation is limited by variation of the boiling point with the liquid mass.
  • CIn an open system, the container would empty due to rapid vaporization of B r ( ) 2 l .
  • DIn an open system, it is always more favorable for the material to exist in the gas phase.
  • EIn an open system, the bromine would be consumed by reaction with air before the phases could equilibrate.


The following reaction occurs when a burner on a gas stove is lit: Which of the following statements is an accurate description of this reaction?

  • AAn equilibrium is not established because the gas stove is not a closed system and the product gases can escape.
  • BAn equilibrium is not established because the rate of the forward reaction is much greater than the rate of the reverse reaction.
  • CAn equilibrium is established because carbon dioxide and water are already present in the air.
  • DAn equilibrium is not established because the reaction is highly exothermic, preventing the temperature from reaching a constant value.
  • EAn equilibrium is established because the reaction does not alter the number of moles of gas in the system.


For H O ( ) 2 s at 0 ∘ C and 1 atm and H O ( ) 2 l at 0 ∘ C and 1 atm, which of the following quantities must be equal for the two phases?

  • AThe molar Gibbs free energy (Gm)
  • BThe molar entropy (Sm)
  • CThe molar volume (Vm)
  • DThe molar enthalpy (Hm)


Which of the following is the correct definition of a reversible reaction?

  • AThe reaction can proceed in both the forward and reverse directions.
  • BA second reaction converts the products of the reaction back to reactants, resulting in a cyclic process.
  • CIf you reverse the flow of time, the reaction will undo itself.
  • DThe forward reaction and the reverse reaction occur at the same rate.
  • EThe reaction can be undone with the right catalyst.