Q1. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines which law?
Solution:
This statement defines the rate law of a chemical reaction.
⏱ Time: 0s
Q2. The half-life of a first-order reaction is independent of the initial concentration. What is the expression for the half-life (t1/2) of a first-order reaction? (2022)
Solution:
The half-life of a first-order reaction is given by the formula t1/2 = 0.693/k, where k is the rate constant.
⏱ Time: 0s
Q3. The half-life of a first-order reaction is independent of which parameter?
Solution:
The half-life of a first-order reaction is independent of the initial concentration.
⏱ Time: 0s
Q4. In a reaction mechanism, what is the term for the slowest step that determines the overall rate of the reaction? (2019)
Solution:
The slowest step in a reaction mechanism that determines the overall rate of the reaction is called the rate-determining step.
⏱ Time: 0s
Q5. Which of the following statements is true regarding the Arrhenius equation? (2023)
Solution:
The Arrhenius equation relates temperature to the rate constant and includes activation energy.
⏱ Time: 0s
Q6. The rate of a reaction is given by the equation rate = k[A]^2[B]. What is the overall order of the reaction? (2020)
Solution:
The overall order of the reaction is 2 (from [A]^2) + 1 (from [B]) = 3.
⏱ Time: 0s
Q7. For a zero-order reaction, how does the concentration of reactants change over time? (2020)
Solution:
In a zero-order reaction, the concentration of reactants decreases linearly with time.
⏱ Time: 0s
Q8. The half-life of a first-order reaction is independent of the initial concentration. What is the expression for the half-life?
Solution:
The half-life of a first-order reaction is given by t₁/₂ = 0.693/k.
⏱ Time: 0s
Q9. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines which of the following? (2020)
Solution:
This statement defines the rate law of a reaction.
⏱ Time: 0s
Q10. What effect does increasing temperature have on the rate of a chemical reaction? (2023)
Solution:
Increasing temperature generally increases the rate of a chemical reaction due to higher kinetic energy.
