Dynamic Equilibrium in Chemical Systems

This lesson covers dynamic equilibrium, explaining the conditions required for it to occur, such as reversible reactions in closed systems. Using analogies and examples, it illustrates how equilibrium is achieved when the forward and reverse reaction rates are equal, resulting in no observable changes. The video also discusses phase changes and their equilibrium conditions.

What happens to the size of the hole if you dig faster than your friend refills it?

• The hole gets larger.

• The hole gets smaller.

• The hole disappears.

• The hole remains the same size.

In a reversible reaction at equilibrium, what is true about the rates of the forward and reverse reactions?

• Both reactions occur at the same rate.

• The reverse reaction is faster.

• The forward reaction is faster.

• Neither reaction occurs.

What are the two essential criteria for a chemical system to be at equilibrium?

• It must be slow and closed.

• It must be fast and open.

• It must be reversible and closed.

• It must be irreversible and open.

What happens to the concentrations of hydrogen, iodine, and hydrogen iodide at equilibrium?

• They decrease.

• They remain constant.

• They increase.

• They fluctuate randomly.

What occurs if the lid of a closed system is removed?

• The system stops reacting.

• The system reaches a new equilibrium.

• The system is no longer at equilibrium.

• The system remains at equilibrium.

What type of change is the equilibrium between liquid and gaseous bromine?

• A chemical reaction.

• A biological process.

• A phase change.

• A nuclear reaction.

What happens to gaseous bromine in a phase change equilibrium?

• It neither evaporates nor condenses.

• It both evaporates and condenses at the same rate.

• It only evaporates.

• It only condenses.

What is the main characteristic of a dynamic equilibrium?

• Only the reverse reaction occurs.

• Both forward and reverse reactions occur at the same rate.

• Only the forward reaction occurs.

• No reactions occur.

What is the observable change in a system at dynamic equilibrium?

• The system changes temperature.

• There is no observable change.

• The system changes pressure.

• The system changes color.

Which of the following is NOT a condition for dynamic equilibrium?

• The rates of forward and reverse reactions must be equal.

• The system must be open.

• The process must be reversible.

• The system must be closed.