Question

The rate of the reaction, 2NO + Cl$_2$ $\rightarrow$ 2NOCl is given by the rate equation, rate = k[NO]$^2$[Cl$_2$]. The value of the rate constant can be increased by

• A. increasing the concentration of NO.
• B. increasing the temperature.
• C. increasing the concentration of the Cl$_2$.
• D. doing all of these.

Hint:

Key Exam Tip:
Remember the distinction between factors affecting the reaction rate and factors affecting the rate constant (k):
• Concentrations of Reactants: Affects the rate directly but does not change the rate constant (k).
• Temperature: Affects both the rate and the rate constant (k). An increase in temperature generally leads to a higher rate constant.
• Catalyst: Speeds up the reaction by increasing the rate constant (k) by lowering the activation energy ($E_a$).

Answer 1

The Correct Option is B