Question

In the equation, rate$={\mathrm{Z}}_{\mathrm{AB}}{\mathrm{e}}^{\frac{-\mathrm{Ea}}{\mathrm{RT}}}$what does ${\mathrm{Z}}_{\mathrm{AB}}$ means?

Answer 1

Collision Theory:

1. For a chemical reaction to begin, the reacting molecules must approach and collide. The bonds between the interacting molecules are severed as a result of these collisions, and the product is created with new bonds.
2. To explain the reaction rates in a gaseous state, Arrhenius presented a simple collision theory. Kinetic molecular theory or reaction rate collision theory is the name given to this theory.
3. Arrhenius equation is given by rate$={\mathrm{Ae}}^{\frac{-\mathrm{Ea}}{\mathrm{RT}}}$ where A is a pre-exponential factor or orientation factor which tells the orientation of the molecule.
4. For reaction $\mathrm{A}+\mathrm{B}\to \mathrm{AB}$, the Pre exponential factor is also given by A$={\mathrm{PZ}}_{\mathrm{AB}}{\mathrm{e}}^{\frac{-\mathrm{Ea}}{\mathrm{RT}}}$ where P represents the probability factor, Z_AB represents collision frequency, Ea represents activation energy, R represents gas constant, and T represents temperature.

Therefore, the collision frequency of the reactants A and B are represented by Z_AB.