Reaction order Knowledge-Based Practice

Questions

1. 1.

   Which statement correctly describes the reaction rate for a process that is zero order with respect to a reactant A?

   • A) The reaction rate is directly proportional to the concentration of A.
   • B) The reaction rate decreases exponentially as the concentration of A decreases.
   • C) The reaction rate remains constant and is independent of the concentration of A.
   • D) The reaction rate is inversely proportional to the concentration of A.
2. 2.

   If the half-life of a chemical reaction remains constant regardless of the initial concentration of the reactant, what is the order of the reaction with respect to that reactant?

   • A) Zero order
   • B) Second order
   • C) First order
   • D) Third order
3. 3.

   For the decomposition of a reactant A, a plot of $1/[\text{A}]$ versus time produces a straight line with a positive slope. What is the order of this reaction with respect to A?

   • A) Second order
   • B) First order
   • C) Zero order
   • D) Third order
4. 4.

   A chemical reaction is experimentally determined to have a rate constant with the units $\text{L}^2\cdot\text{mol}^{-2}\cdot\text{s}^{-1}$. What is the overall order of this reaction?

   • A) Second order
   • B) Third order
   • C) First order
   • D) Zero order
5. 5.

   For a chemical reaction with the rate law $\text{Rate} = k[\text{X}]^2[\text{Y}]$, by what factor does the initial rate change if the concentration of X is tripled and the concentration of Y is doubled?

   • A) It increases by a factor of 18.
   • B) It increases by a factor of 12.
   • C) It increases by a factor of 6.
   • D) It increases by a factor of 36.

Answers and step-by-step solutions appear after you finish the test.