Dynamic equilibrium

This episode focuses on dynamic equilibrium, a key concept in chemical equilibrium where the forward and reverse reactions occur at equal rates. We'll explore the characteristics of dynamic equilibrium, how it relates to reaction rates, and its role in maintaining a balance in closed systems. Building on topics like equilibrium constants and Le Chatelier's principle, this episode prepares you for advanced discussions on acid-base equilibrium, buffer solutions, and the common ion effect.

Check your understanding

These are the same multiple-choice questions you will see in the Quiz section after you listen to the episode. Use them here to preview or review the answers.

What is dynamic equilibrium?

  1. A state where forward and reverse reactions occur at equal rates.
  2. A condition where no reactions occur.
  3. A balance achieved in a closed system.
  4. A situation where reactants are completely converted to products.
  5. A system where concentrations of reactants and products remain constant over time.

What is required for dynamic equilibrium to occur?

  1. A closed system.
  2. Equal concentrations of reactants and products.
  3. Sufficient time for the system to stabilize.
  4. Constant temperature and pressure.
  5. No disturbances to the system.

How does Le Chatelier’s principle describe equilibrium shifts?

  1. The system counteracts disturbances to restore equilibrium.
  2. Adding reactants shifts equilibrium toward products.
  3. Increasing pressure favors the side with fewer gas molecules.
  4. Decreasing temperature favors endothermic reactions.
  5. Equilibrium always shifts to increase product formation.

What happens to reaction rates at dynamic equilibrium?

  1. Forward and reverse rates are equal.
  2. Forward rate stops completely.
  3. Reverse rate exceeds the forward rate.
  4. Both rates fluctuate continuously.
  5. No net change occurs in reactant or product amounts.

What is an example of dynamic equilibrium in nature?

  1. The equilibrium between liquid water and vapor in a sealed container.
  2. The complete combustion of methane gas.
  3. Photosynthesis and cellular respiration balance in plants.
  4. The freezing of water into ice.
  5. The static balance of objects in a system.

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