Question

How can adding heat to a reaction change the rate of a chemical reaction?

Answer 1

It is clear with the question that by adding heat to any reaction means increasing the temperature of the reaction. This in turn increases the kinetic energy of reactants and more collision takes place.

Complete answer:
- As we know that as there is increase in the temperature then there is increase in the reaction rates this is because of the increase in the number of high energy collisions between the molecules.
- Temperature is basically a measure of the average kinetic energy of the molecules that are in motion.
- It is found that if the temperature is raised then the kinetic energies of all reactants are increased, then there are more collisions per second. And the greater fraction of these leads to the chemical reactions.
- We can assume that the rate of all the reactions increases as temperature increases, and this does not depend on whether they are endothermic or exothermic reactions.

Additional information:
The average kinetic energy of a particle is dependent upon the absolute temperature of the system. The absolute temperature is a scale for measurement of temperature of temperature of an object where 0 is taken as an absolute zero.

Note:
Increase in temperature increases the rate of the reaction. This is because of the fact that as a reaction is carried out by the effective collisions of reacting molecules, the increase in temperature increases their kinetic energy and thereby increases the number of effective collisions.