Question

consider the reaction of ozone (o₃) with nitrogen monoxide (no), which occurs in smog: o₃(g) + no(g) → o₂(g) + no₂(g) part 1 of 2 what effect would decreasing the concentration of o₃ have on the reaction rate? select the single best answer. o reaction rate increases. o reaction rate stays the same. o reaction rate decreases. part 2 of 2 what effect would increasing the temperature have on the reaction rate? select the single best answer. o reaction rate increases. o reaction rate stays the same. o reaction rate decreases.

Explanation:

• Part 1 of 2: According to the collision - theory, the rate of a chemical reaction is proportional to the number of effective collisions between reactant molecules. When the concentration of \(O_3\) (a reactant) decreases, the number of \(O_3\) molecules available to collide with \(NO\) molecules decreases. Fewer collisions mean a lower reaction rate.
• Part 2 of 2: Temperature affects the kinetic energy of molecules. According to the Arrhenius equation \(k = A e^{-\frac{E_a}{RT}}\), where \(k\) is the rate constant, \(A\) is the pre - exponential factor, \(E_a\) is the activation energy, \(R\) is the gas constant, and \(T\) is the temperature. As \(T\) increases, the value of \(e^{-\frac{E_a}{RT}}\) increases (since the exponent becomes less negative), which means the rate constant \(k\) increases. A higher rate constant leads to a higher reaction rate.

Answer:

• Part 1 of 2: Reaction rate decreases.
• Part 2 of 2: Reaction rate increases.