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Chapter 12: Q56 E (page 708)

:How does an increase in temperature affect rate of reaction? Explain this effect in terms of the collision theory of the reaction rate

Short Answer

Expert verified
  1. A rise within the temperature increases the reaction rate.
  2. As per the collision theory of reaction rate, temperature increment increases the K.E. of molecules. This increases the effective collision rate and thus the speed of reaction.

Step by step solution

01

Collision Theory

As per the collision theory, the speed of the reaction depends on the collision frequency and also the energy.

\({\bf{Rate(R) = Z \times }}{{\bf{e}}^{{\bf{ - }}\frac{{{{\bf{E}}_{\bf{a}}}}}{{{\bf{RT}}}}}}\)

where Z and\({{\bf{E}}_{\bf{a}}}\)are the collision frequency and energy of activation respectively.

The collision frequency represents the quantity of effective collisions per second per unit volume.

02

Increase the temperature.

As the temperature increases, the mechanical energy of the molecules present within the reaction mixture increases. Hence, the molecules will collide more often, which can increase the speed of effective collisions, as more molecules will have the required energy. This thus increases the reaction rate.

Considering the mathematical tools, the equation of the reaction rate indicates an exponential increase in reaction rate with the rise in temperature.

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