Le Chatelier

What is the effect of increasing concentration of a reactant on equilibrium?

• It shifts the equilibrium to the left, favoring the formation of reactants.

• It has no effect on the equilibrium position.

• It shifts the equilibrium to the right, favoring the formation of products.

• It causes the equilibrium to become unstable.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

How does increasing temperature affect an endothermic reaction at equilibrium?

• Increasing temperature shifts the equilibrium to the left, favoring the reactants.

• Increasing temperature has no effect on the equilibrium position.

• Increasing temperature shifts the equilibrium to the right, favoring the products.

• Increasing temperature shifts the equilibrium to the right, favoring the reactants.

Tags

NGSS.HS-PS1-6

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

• It changes the position of equilibrium favoring the products.

• It slows down the reaction rate of both forward and reverse reactions.

• It speeds up the rate of both the forward and reverse reactions equally, but does not change the position of equilibrium.

• It only affects the forward reaction, increasing its rate.

Tags

NGSS.HS-PS1-6

What happens to equilibrium when a solvent is added to a reaction?

• The position of equilibrium shifts to favor the products.

• The position of equilibrium shifts to favor the reactants.

• The position of equilibrium may shift depending on the concentration of reactants and products, but generally, it dilutes the system.

• The position of equilibrium remains unchanged.

How does increasing temperature affect an exothermic reaction at equilibrium?

• Increasing temperature shifts the equilibrium to the right, favoring the products.

• Increasing temperature shifts the equilibrium to the left, favoring the reactants.

• Increasing temperature has no effect on the equilibrium position.

• Increasing temperature increases the rate of the reaction without affecting equilibrium.

Tags

NGSS.HS-PS1-6

How does the addition of water affect the equilibrium of a reaction?

• It has no effect on the equilibrium.

• It can dilute the concentrations of reactants and products, potentially shifting the equilibrium depending on the specific reaction.

• It always shifts the equilibrium to the right.

• It increases the rate of the reaction without affecting equilibrium.

Tags

NGSS.HS-PS1-6

What is the relationship between K_eq and the position of equilibrium?

• K_eq indicates the ratio of concentrations of products to reactants at equilibrium; it remains constant unless temperature changes.

• K_eq varies with the concentration of reactants only.

• K_eq is only relevant at high temperatures and has no effect at low temperatures.

• K_eq can change based on the pressure of the system.

What is the effect of decreasing pressure on a gaseous equilibrium with more moles of gas on the reactant side?

• Decreasing pressure shifts the equilibrium to the left, favoring the formation of reactants.

• Decreasing pressure has no effect on the equilibrium position.

• Decreasing pressure shifts the equilibrium to the right, favoring the formation of products.

• Decreasing pressure increases the rate of the reaction without affecting equilibrium.

What is the effect of adding OH- ions to a reaction that produces H+ ions?

• Adding OH- ions will shift the equilibrium to the right, favoring the formation of products, as it removes H+ ions.

• Adding OH- ions will shift the equilibrium to the left, favoring the formation of reactants, as it increases H+ ions.

• Adding OH- ions will have no effect on the equilibrium position of the reaction.

• Adding OH- ions will increase the concentration of H+ ions, thus shifting the equilibrium to the right.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

What happens to equilibrium when a product is added?

• The position of equilibrium shifts to the left, favoring the formation of reactants.

• The position of equilibrium shifts to the right, favoring the formation of products.

• The position of equilibrium remains unchanged.

• The position of equilibrium shifts to the left, favoring the formation of both reactants and products equally.

Tags

NGSS.HS-PS1-6