Question

Why does an increase in temperature result in an increase in reaction rate?

A) An increase in temperature raises the activation energy which increases the reaction rate.



B) An increase in temperature causes the molecules to increase in size which increases reaction rate.

C) An increase in temperature decreases the concentration of reactants which increases reaction rate.

D) An increase in temperature causes an increases the number of collisions which increases reaction rates.

Answer 1

An increase in temperature raises the activation energy, increasing the reaction rate due to increased frequency and force of collisions.

Step-by-step explanation:

An increase in temperature raises the activation energy which increases the reaction rate. When the reactant particles are heated, they move faster and faster, resulting in a greater frequency of collisions. An even more important effect of the temperature increase is that the collisions occur with a greater force, which means the reactants are more likely to surmount the activation energy barrier and go on to form products. Increasing the temperature of a reaction increases not only the frequency of collisions, but also the percentage of those collisions that are effective, resulting in an increased reaction rate.

Answer 2

Answer: D) An Increase in temperature causes increases the number of collisions, which increases reaction rates.

Step-by-step explanation:

Particles can only interact when they collide, increasing a substance's temperature will increase the movement of particles, which in turn increases the chances of collisions between these particles. Increasing the collisions between molecules increases the reaction rates.