Reaction order Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following statements correctly describes the reaction order for a reactant in an overall chemical reaction?

   • A) It is directly determined by the stoichiometric coefficient of that reactant in the overall balanced equation.
   • B) It must always be a positive whole integer and cannot have zero, negative, or fractional values.
   • C) It changes proportionally with temperature as the value of the rate constant increases.
   • D) It is an experimentally determined value that cannot be reliably deduced solely from the overall balanced equation.
2. 2.

   A chemical reaction has the experimentally determined rate law $\text{Rate} = k[\text{A}]^{3/2}[\text{B}]^{-1}$. What is the overall order of this reaction?

   • A) $-1$
   • B) $0$
   • C) $\frac{1}{2}$
   • D) $\frac{5}{2}$
3. 3.

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

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

   For a chemical reaction involving a single reactant A, decreasing the initial concentration of A by a factor of 2 causes the initial reaction rate to decrease by a factor of 8. What is the reaction order with respect to reactant A?

   • A) 3
   • B) 2
   • C) 1
   • D) 4
5. 5.

   In a kinetics experiment for the reaction $\text{A} + \text{B} \rightarrow \text{products}$, tripling the concentration of reactant $\text{A}$ while keeping the concentration of $\text{B}$ constant increases the initial rate by a factor of 9, whereas doubling the concentration of $\text{B}$ while keeping $\text{A}$ constant does not change the initial rate. What are the reaction orders with respect to $\text{A}$ and $\text{B}$, respectively?

   • A) First order with respect to A and first order with respect to B
   • B) First order with respect to A and zero order with respect to B
   • C) Second order with respect to A and zero order with respect to B
   • D) Second order with respect to A and first order with respect to B