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Chapter 13: Problem 12

On which of the following properties does the rate constant of a reaction depend: (a) reactant concentrations, (b) nature of reactants, or (c) temperature?

Short Answer

Expert verified
The rate constant of a reaction depends upon the nature of reactants and the temperature but not on the reactant concentrations

Step by step solution

01

Reactant Concentrations

The Rate constant of a reaction does not depend on the concentrations of the reactants. It's important to keep in mind the difference between rate of reaction and rate constant. While rate of reaction depends on concentrations of reactants, the rate constant for a given reaction at a specific temperature does not.
02

Nature of Reactants

The Rate constant of a reaction does depend on the nature of the reactants. Different reactants will react at different rates depending on their chemical and physical properties such as their reactivity, physical state, and particle size.
03

Temperature

The Rate constant of a reaction does depend on the temperature. Increasing the temperature increases the kinetic energy of the particles, leading to more collisions and thus a higher rate of reaction. Therefore, the rate constant typically increases with temperature.

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Most popular questions from this chapter

Determine the molecularity and write the rate law for each of the following elementary steps: (a) \(\mathrm{X} \longrightarrow\) products (b) \(\mathrm{X}+\mathrm{Y} \longrightarrow\) products (c) \(\mathrm{X}+\mathrm{Y}+\mathrm{Z} \longrightarrow\) products (d) \(\mathrm{X}+\mathrm{X} \longrightarrow\) products (e) \(\mathrm{X}+2 \mathrm{Y} \longrightarrow\) products

Define activation energy. What role does activation energy play in chemical kinetics?

Reactions can be classified as unimolecular, bimolecular, and so on. Why are there no zeromolecular reactions? Explain why termolecular reactions are rare.

Briefly comment on the effect of a catalyst on each of the following: (a) activation energy, (b) reaction mechanism, (c) enthalpy of reaction, (d) rate of forward step, (e) rate of reverse step.

The reaction \(2 \mathrm{~A}+3 \mathrm{~B} \longrightarrow \mathrm{C}\) is first order with respect to \(\mathrm{A}\) and \(\mathrm{B}\). When the initial concentrations are \([\mathrm{A}]=1.6 \times 10^{-2} M\) and \([\mathrm{B}]=2.4 \times 10^{-3} M,\) the rate is \(4.1 \times 10^{-4} M / \mathrm{s} .\) Calculate the rate constant of the reaction.
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