reversible reactions Flashcards
What is a reversible reaction?
A reaction that can proceed in both the forward and reverse directions.
True or False: In a reversible reaction, products can react to form reactants.
True
What symbol is commonly used to indicate a reversible reaction?
The double arrow (⇌)
Fill in the blank: In a reversible reaction, the rate of the forward reaction equals the rate of the reverse reaction at __________.
equilibrium
What is chemical equilibrium?
A state where the concentrations of reactants and products remain constant over time.
Which principle describes how a system at equilibrium responds to changes in concentration, temperature, or pressure?
Le Chatelier’s Principle
Multiple Choice: What happens to the equilibrium position if the concentration of reactants is increased? A) Shifts to the right B) Shifts to the left C) No change
A) Shifts to the right
What effect does increasing temperature have on an exothermic reaction at equilibrium?
It shifts the equilibrium position to the left.
True or False: Catalysts affect the position of equilibrium.
False
What is the Equilibrium Constant (K)?
A ratio of the concentrations of products to reactants at equilibrium, each raised to the power of their coefficients.
Fill in the blank: If K > 1, the equilibrium position favors the __________.
products
What does it mean if K < 1?
The equilibrium position favors the reactants.
Multiple Choice: Which of the following factors does NOT affect equilibrium? A) Concentration B) Pressure C) Catalyst D) Temperature
C) Catalyst
What is dynamic equilibrium?
A condition where the forward and reverse reactions occur at the same rate.
True or False: In dynamic equilibrium, the concentrations of reactants and products change over time.
False
What is the reaction quotient (Q)?
A measure of the relative amounts of products and reactants at any point in time.
Fill in the blank: If Q < K, the reaction will shift to the __________.
right
What happens to equilibrium when pressure is increased in a gaseous reaction?
It shifts to the side with fewer moles of gas.
What is the effect of adding an inert gas to a reaction at equilibrium?
It has no effect on the position of equilibrium.
True or False: Equilibrium can be reached from either direction of a reversible reaction.
True
What does a large value of K signify about the reaction?
The reaction strongly favors the formation of products.
Fill in the blank: The equilibrium constant expression only includes __________.
gases and aqueous species
What is the relationship between temperature and the equilibrium constant for an endothermic reaction?
As temperature increases, K increases.
Multiple Choice: What does a catalyst do in a reversible reaction? A) Changes K B) Increases rate of forward reaction C) Increases rate of reverse reaction D) Both B and C
D) Both B and C
