Le Chatelier's Principle and Equilibrium Shifts in Chemical Reactions

This video explains Le Chatelier's principle, which describes how the position of equilibrium in a reversible reaction is affected by changes in temperature, pressure, and concentration. It uses the example of ammonia production to illustrate how equilibrium shifts in response to these changes, moving towards the exothermic or endothermic direction based on temperature, and towards the side with fewer or more molecules based on pressure and concentration changes.

What does Le Chatelier's Principle primarily describe?

• The rate of a chemical reaction.

• The energy change in a reaction.

• The position of equilibrium in a reversible reaction.

• The color change in a reaction.

If a reaction is exothermic in the forward direction, what can be said about the reverse reaction?

• It is faster than the forward reaction.

• It is endothermic.

• It is also exothermic.

• It has no energy change.

How does decreasing the temperature affect the equilibrium position of an exothermic reaction?

• Equilibrium shifts randomly.

• Equilibrium shifts to the right.

• Equilibrium shifts to the left.

• Equilibrium remains unchanged.

What happens to the equilibrium position when the temperature is increased in an endothermic reaction?

• It shifts to the side with more reactants.

• It remains unchanged.

• It shifts to the right.

• It shifts to the left.

In a sealed system, how does increasing pressure affect the equilibrium position?

• It shifts to the side with fewer molecules.

• It shifts to the side with more molecules.

• It shifts to the side with more energy.

• It remains unchanged.

What is the effect of decreasing pressure on the equilibrium position in a reaction with different numbers of molecules on each side?

• Equilibrium shifts to the side with more molecules.

• Equilibrium shifts to the side with less energy.

• Equilibrium shifts to the side with fewer molecules.

• Equilibrium remains unchanged.

How does adding more reactant affect the equilibrium position?

• It shifts to the side with more reactants.

• It shifts to the side with more products.

• It remains unchanged.

• It shifts to the side with less energy.

What happens to the equilibrium position if the concentration of a product is increased?

• It shifts to the side with more products.

• It shifts to the side with more reactants.

• It remains unchanged.

• It shifts to the side with less energy.

Which of the following is NOT a factor affecting the position of equilibrium according to Le Chatelier's Principle?

• Concentration

• Pressure

• Temperature

• Catalyst

What is the primary goal of the equilibrium shift when a change is applied to a system?

• To consume more reactants.

• To produce more products.

• To counteract the change applied.

• To increase the reaction rate.