Factors that affect chemical equilibrium

Which factors can cause a shift in the position of chemical equilibrium?

• Change in concentration of reactants or products
• Change in pressure for gaseous systems
• Change in volume for liquid systems
• Change in temperature

According to Le Chatelier's Principle, how does a system at equilibrium respond to a decrease in temperature?

• Favours the exothermic reaction
• Favours the endothermic reaction
• Shifts to increase temperature
• Shifts to decrease temperature

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

• Increases the rate of the forward reaction
• Increases the rate of the reverse reaction
• Changes the position of equilibrium
• Decreases the activation energy of the reaction

What happens to the position of equilibrium when the pressure is increased for a reaction involving gases?

• Shifts to the side with more moles of gas
• Shifts to the side with fewer moles of gas
• Remains unchanged if the number of moles of gas is equal on both sides
• Shifts to the side with higher molecular weight gases

Which statement is true regarding the equilibrium constant (Kc) for a reversible reaction?

• It changes with temperature
• It is unaffected by changes in pressure
• It decreases with the addition of a catalyst
• It is the same for both the forward and reverse reactions

How does an increase in the concentration of reactants affect a system at equilibrium?

• Shifts the equilibrium to the left
• Shifts the equilibrium to the right
• Increases the value of the equilibrium constant
• Increases the rate at which equilibrium is achieved

What is the consequence of removing a product from a chemical equilibrium?

• Equilibrium shifts to the right to produce more product
• Equilibrium shifts to the left to consume more reactants
• The equilibrium constant increases
• The reaction stops completely

What effect does a decrease in temperature have on an exothermic reaction at equilibrium?

• Shifts the equilibrium towards the reactants
• Shifts the equilibrium towards the products
• Decreases the equilibrium constant
• Increases the rate of the reverse reaction

In a closed system at equilibrium, what is the effect of increasing the volume?

• Decreases pressure and shifts the equilibrium towards more moles of gas
• Increases pressure and shifts the equilibrium towards fewer moles of gas
• Has no effect on liquid or solid equilibrium systems
• Increases the equilibrium constant

Which of these changes will NOT affect the equilibrium position of a system?

• Adding a catalyst
• Changing the concentration of a reactant
• Altering the temperature
• Using a different container without changing the volume