C 8 Rates And Equibrilium Flashcards
(32 cards)
What is the definition of reaction rate?
The change in concentration of reactants or products per unit time.
True or False: Increasing temperature generally increases the rate of a chemical reaction.
True
Fill in the blank: The rate of a reaction can be affected by the concentration of __________.
reactants
What is equilibrium in a chemical reaction?
The state where the rates of the forward and reverse reactions are equal.
Multiple Choice: Which factor does NOT affect the rate of a chemical reaction? A) Temperature B) Surface area C) Color D) Concentration
C) Color
What is the role of a catalyst in a chemical reaction?
A catalyst increases the rate of a reaction without being consumed in the process.
True or False: At equilibrium, the concentrations of reactants and products remain constant.
True
What does the term ‘dynamic equilibrium’ mean?
It refers to the condition where the forward and reverse reactions continue to occur at equal rates.
Fill in the blank: The __________ principle states that if a system at equilibrium is subjected to a change, the system shifts to counteract that change.
Le Chatelier’s
What happens to the equilibrium position when the concentration of reactants is increased?
The equilibrium shifts to the right, favoring the formation of products.
Multiple Choice: Which of the following will shift the equilibrium to the left? A) Adding more product B) Increasing temperature C) Decreasing pressure D) All of the above
D) All of the above
What is the effect of increasing pressure on a gaseous equilibrium with unequal moles of reactants and products?
The equilibrium shifts towards the side with fewer moles of gas.
True or False: A catalyst changes the position of equilibrium.
False
What is meant by ‘rate constant’ in a chemical reaction?
The proportionality constant in the rate equation that is specific to a given reaction at a specific temperature.
Fill in the blank: The __________ of a reaction is the sum of the powers of the concentration terms in the rate equation.
order
Multiple Choice: What is the effect of increasing surface area on the reaction rate? A) Decreases it B) No effect C) Increases it D) Depends on the reaction
C) Increases it
What is a reversible reaction?
A reaction that can proceed in both the forward and reverse directions.
True or False: The equilibrium constant (K) is temperature dependent.
True
What does a large equilibrium constant (K) indicate?
It indicates that the reaction favors the formation of products at equilibrium.
Fill in the blank: The __________ effect refers to the change in equilibrium that occurs when a system is subjected to a change in concentration, temperature, or pressure.
Le Chatelier’s
What is the term for the maximum amount of product that can be formed from a given amount of reactant?
Theoretical yield
Multiple Choice: Which of the following is NOT a factor affecting reaction rates? A) Temperature B) Concentration C) Volume D) Pressure
C) Volume
What does the term ‘rate-determining step’ mean?
The slowest step in a reaction mechanism that determines the overall reaction rate.
True or False: Increasing the concentration of a reactant will always increase the reaction rate.
False
