Chemical Equilibrium

Can the value of the equilibrium constant (K) change with temperature?

• Yes, the value of K is temperature-dependent

• No, the value of K remains constant regardless of temperature

• Only for exothermic reactions

• Only for endothermic reactions

How can the equilibrium constant (K) be used to predict the direction of a reaction?

• If K is greater than 1, the reaction will proceed to the right (towards products)

• If K is greater than 1, the reaction will proceed to the left (towards reactants)

• If K is less than 1, the reaction will proceed to the right (towards products)

• If K is less than 1, the reaction will proceed to the left (towards reactants)

Tags

NGSS.HS-PS1-6

What role did Cato Guldberg and Peter Waage play in understanding chemical equilibrium?

• They discovered the law of mass action

• They formulated the concept of the equilibrium constant

• They developed the method for measuring equilibrium concentrations

• They studied the reaction between NO2 and N2O4

Tags

NGSS.HS-PS1-6

Why is the equilibrium constant expressed using the concentrations of reactants and products rather than their amounts in moles?

• Concentrations allow for easier comparison between different reactions

• Concentrations are more precise than moles in measuring the extent of a reaction

• Concentrations take into account the volume of the reaction vessel

• Concentrations are directly related to the rate of the reaction

What is the key characteristic of a reversible reaction at equilibrium?

• The conversion of reactants into products only

• The conversion of products into reactants only

• The forward and reverse reactions occurring simultaneously

• The absence of any reaction occurring

Tags

NGSS.HS-PS1-6

Which of the following best describes a reversible chemical reaction?

• A reaction that proceeds in only one direction

• A reaction where the concentrations of reactants and products remain constant

• A reaction that involves different substances as reactants and products

• A reaction that occurs at a constant temperature

Tags

NGSS.HS-PS1-6

At the start of a reversible process, the reaction proceeds towards the formation of:

• Reactants

• Products

• Equilibrium

• Catalysts

What is the law of mass action?

• The law stating that equilibrium constants remain constant with changing concentrations

• The law stating that the rate of a chemical reaction is directly proportional to the concentration of reactants

• The law stating that the volume of a gas is inversely proportional to its pressure

• The law stating that energy is conserved in a chemical reaction

Tags

NGSS.HS-PS1-5

How can the equilibrium constant be affected by changes in pressure?

• Increasing the pressure will decrease the value of K

• Decreasing the pressure will increase the value of K

• Changes in pressure have no effect on the value of K

• Increasing the pressure will increase the value of K

An increase in carbon dioxide shifts 

• Left (towards reactants)

• Right (towards products)

• Does not affect equilibrium

Tags

NGSS.HS-PS1-6