All flashcards
Flashcard 1: What is the effect of temperature on the activation energy?
Answer: No effect; activation energy is constant. Activation energy is an intrinsic property.
Flashcard 2: What is the effect of a catalyst on the rate constant?
Answer: Increases the rate constant. Provides lower activation energy pathway.
Flashcard 3: Identify the unit of the rate constant for a third-order reaction.
Answer: M^{-2} s^{-1}. Pattern: M1−ns−1 where n=3.
Flashcard 4: How do you experimentally determine the rate law of a reaction?
Answer: Using the method of initial rates. Measure initial rates at different concentrations.
Flashcard 5: What is the relationship between temperature and the rate constant?
Answer: Rate constant increases with temperature. Exponential relationship from Arrhenius equation.
Flashcard 6: What is the effect of pressure on the rate of a gaseous reaction?
Answer: Increasing pressure increases the rate. Higher pressure increases concentration of gases.
Flashcard 7: What affects the frequency factor (A) in the Arrhenius equation?
Answer: Orientation and frequency of collisions. Pre-exponential factor in Arrhenius equation.
Flashcard 8: Identify the unit of the rate constant for a third-order reaction.
Answer: M−2s−1. Pattern: M1−ns−1 where n=3.
Flashcard 9: Identify the rate-determining step in a reaction mechanism.
Answer: The slowest step in the mechanism. Controls overall reaction rate.
Flashcard 10: How do you experimentally determine the rate law of a reaction?
Answer: Using the method of initial rates. Measure initial rates at different concentrations.
Flashcard 11: What is the typical effect of a catalyst on reaction equilibrium?
Answer: No effect on equilibrium position. Speeds both forward and reverse reactions equally.
Flashcard 12: What is the relationship between temperature and the rate constant?
Answer: Rate constant increases with temperature. Exponential relationship from Arrhenius equation.
Flashcard 13: What is the effect of pressure on the rate of a gaseous reaction?
Answer: Increasing pressure increases the rate. Higher pressure increases concentration of gases.
Flashcard 14: What is the effect of temperature on the activation energy?
Answer: No effect; activation energy is constant. Activation energy is an intrinsic property.
Flashcard 15: Identify the order of reaction if rate = k[A]^2.
Answer: Second order with respect to A. Exponent of [A] is 2.
Flashcard 16: Identify the rate-determining step in a reaction mechanism.
Answer: The slowest step in the mechanism. Controls overall reaction rate.
Flashcard 17: Identify the order of reaction if rate = k[A][B].
Answer: Second order overall. Sum of exponents: 1 + 1 = 2.
Flashcard 18: Which factors influence the activation energy of a reaction?
Answer: Nature of reactants and presence of a catalyst. Intrinsic properties determine energy barrier height.
Flashcard 19: What is the relationship between temperature and the rate constant?
Answer: Rate constant increases with temperature. Exponential relationship from Arrhenius equation.
Flashcard 20: What is the effect of pressure on the rate of a gaseous reaction?
Answer: Increasing pressure increases the rate. Higher pressure increases concentration of gases.
Flashcard 21: Identify the units of the rate constant for a second-order reaction.
Answer: M^{-1} s^{-1}. Units are M1−ns−1 where n is overall order.
Flashcard 22: What is the typical unit for reaction rate?
Answer: Molarity per second (M/s). Change in concentration per unit time.
Flashcard 23: Which graph is linear for a first-order reaction?
Answer: ln[A] vs. time. Integrated rate law form for first-order kinetics.
Flashcard 24: What is the relationship between reaction rate and concentration for a zero-order reaction?
Answer: Rate is independent of concentration. Constant rate regardless of concentration changes.
Flashcard 25: What does the term 'reaction mechanism' refer to?
Answer: The step-by-step sequence of elementary reactions. Shows how overall reaction occurs at molecular level.
Flashcard 26: What is the effect of increasing concentration on reaction rate?
Answer: Increases the reaction rate. More reactant molecules available for collision.
Flashcard 27: Which factor does not affect the rate constant?
Answer: Concentration of reactants. Rate constant only depends on temperature and catalyst.
Flashcard 28: State the expression for the half-life of a zero-order reaction.
Answer: t1/2=2k[A]0. Half-life depends on initial concentration.
Flashcard 29: Define rate constant in the context of reaction rates.
Answer: The proportionality constant (k) in the rate law. Units depend on reaction order.
Flashcard 30: What is the effect of temperature on the activation energy?
Answer: No effect; activation energy is constant. Activation energy is an intrinsic property.