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Chapter 12: Q68 E (page 710)

Why are elementary reactions involving three or more reactants very uncommon?

Short Answer

Expert verified

The reaction rate depends on the number and orientation of collisions between the reactant molecules.

Step by step solution

01

Explanation

Reactions involving a small number of reactants (one or two) which follow proper chemical rate laws are known as elementary reactions.

The probability that three or more reactant molecules collide simultaneously and with proper orientation is very low.

Usually, collisions can occur easily between two molecules. So, collisions involving three reactants are statistically lower. The probability that the collision is properly oriented is thus even lower.

02

Answer

Therefore, elementary reactions with three or more reactants are very uncommon.

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Most popular questions from this chapter

Chemical reactions occur when reactants collide. What are two factors that may prevent a collision from producing a chemical reaction?

Based on the diagrams in Exercise 12.83, which of the reactions has the fastest rate? Which has the slowest rate?

How much and in what direction will each of the following effect the rate of the reaction:

CO(g) + \({\bf{NO}}{}_{\bf{2}}\) (g)鉄� \({\bf{CO}}{}_{\bf{2}}\) (g) + NO(g) if the rate law for the reaction is rate =\({\bf{k(NO}}{}_{\bf{2}}{{\bf{)}}^{\bf{2}}}{\bf{a}}\)?

  1. Decreasing the pressure of \({\bf{NO}}{}_{\bf{2}}\) from 0.50 atm to 0.250 atm.
  2. Increasing the concentration of CO from 0.01 M to 0.03 M.

The first-order radioactive decay of iodine-131 exhibits a rate constant of 0.138 \({{\bf{d}}^{{\bf{ - 1}}}}\). What is the half-life for this decay?

In an experiment, a sample of NaClO3 was 90% decomposed in 48 min. Approximately how long would this decomposition have taken if the sample had been heated 20掳C higher?
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