18.2 Le Chatelier's Principle

Front

What does Le Chatelier's Principle state?

Back

If a chemical system at equilibrium is stressed, the system will adjust to reduce the stress.

Front

What happens when the temperature of a closed equilibrium system is increased?

Back

The reaction will shift in the endothermic direction.

Front

What is the effect of increasing the concentration of a reactant in a chemical reaction at equilibrium?

Back

The equilibrium will shift to the right, favoring the production of products.

Front

What occurs when SCN- is removed from the reaction Fe^3+ + SCN ↔ FeSCN^2+?

Back

The reaction will produce more reactants and decrease the amount of products.

Front

What happens if only reactants are added to a reaction container at equilibrium?

Back

The reaction can only shift right to make products.

Front

Define equilibrium in a chemical reaction.

Back

Equilibrium is the state in which the concentrations of reactants and products remain constant over time.

Front

What is an endothermic reaction?

Back

An endothermic reaction is one that absorbs heat from the surroundings.

Front

What is an exothermic reaction?

Back

An exothermic reaction is one that releases heat to the surroundings.

Front

How does a decrease in pressure affect a gaseous equilibrium reaction?

Back

The equilibrium will shift to the side with more moles of gas.

Front

What is the effect of adding a catalyst to a chemical reaction at equilibrium?

Back

A catalyst speeds up the rate of both the forward and reverse reactions but does not affect the position of equilibrium.