The Effects of Changing Concentration, Temperature, and Pressure on Chemical Reactions

• The rate at which reactants are converted into products

• The ratio of the concentration of products to reactants at equilibrium

• The speed at which equilibrium is reached

• The temperature dependence of the reaction

If the equilibrium constant for a reaction is greater than 1, what does this indicate?

• The concentration of reactants is higher than that of products at equilibrium

• The concentration of products is higher than that of reactants at equilibrium

• The reaction does not reach equilibrium

• The reaction is exothermic

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NGSS.HS-PS1-6

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

• It shifts the equilibrium to the right, favoring product formation

• It shifts the equilibrium to the left, favoring reactant formation

• It does not affect the equilibrium position

• It increases the equilibrium constant

Tags

NGSS.HS-PS1-5

What effect does decreasing the volume of a gaseous reaction system at constant temperature have on the equilibrium position?

• It shifts the equilibrium towards the side with more gas molecules

• It shifts the equilibrium towards the side with fewer gas molecules

• It does not affect the equilibrium position

• It increases the equilibrium constant

How does the addition of a catalyst affect the equilibrium of a chemical reaction?

• It shifts the equilibrium position to the right

• It shifts the equilibrium position to the left

• It does not affect the equilibrium position but increases the rate at which equilibrium is reached

• It changes the equilibrium constant

What happens to the equilibrium position when the concentration of a reactant is increased?

• It shifts to produce more products

• It shifts to produce more reactants

• It does not change

• The equilibrium constant increases

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

In the context of Le Chatelier's Principle, what is the effect of adding more product to a reaction at equilibrium?

• The equilibrium shifts to favor the reactants

• The equilibrium shifts to favor more product formation

• The equilibrium position does not change

• The equilibrium constant decreases

What is the effect of increasing pressure on a reaction system where the number of moles of gas decreases from reactants to products?

• The equilibrium shifts towards the products

• The equilibrium shifts towards the reactants

• The equilibrium position remains unchanged

• The equilibrium constant increases

• It changes with the addition of a catalyst

• It remains constant with changes in concentration of reactants or products

• It increases with an increase in temperature for an exothermic reaction

• It is only applicable to reactions involving gases

How does a decrease in temperature affect the equilibrium of an endothermic reaction?

• It shifts the equilibrium towards the products

• It shifts the equilibrium towards the reactants

• It does not affect the equilibrium position

• It decreases the equilibrium constant

Tags

NGSS.HS-PS1-6