Effect of concentration change on equilibrium

The video explains how changes in concentration affect chemical equilibrium. When a substance is added or removed, it creates stress, disturbing the equilibrium. The chemical reaction then shifts to relieve this stress, partially restoring the concentration. An example of hydrogen iodide formation in a closed container is discussed. Adding hydrogen gas increases its concentration, creating stress. Le Chatelier's principle is applied to shift the reaction towards the formation of hydrogen iodide, restoring equilibrium.

What happens to the concentration of a substance when it is added to an equilibrium mixture?

• It decreases.

• It remains unchanged.

• It becomes zero.

• It increases.

In the example of hydrogen iodide formation, what is the effect of adding hydrogen gas to the equilibrium mixture?

• The concentration of iodine gas decreases.

• The concentration of hydrogen iodide decreases.

• The concentration of hydrogen gas decreases.

• The concentration of hydrogen gas increases.

What principle is applied to restore equilibrium when stress is introduced to a chemical reaction?

• Dalton's Law

• Avogadro's Law

• Le Chatelier's Principle

• Boyle's Law

According to Le Chatelier's Principle, how does a reaction respond to an increase in reactant concentration?

• The reaction shifts to the left.

• The reaction shifts to the right.

• The reaction remains unchanged.

• The reaction stops completely.

What is the result of the forward reaction occurring in the hydrogen iodide formation example?

• The concentration of products decreases.

• The concentration of reactants increases.

• The equilibrium is restored.

• The equilibrium is permanently disturbed.