rates of reaction

what is the rate of reaction?

the measure of the change in conc of the reactants/products over time

what is the effect of increasing the temperature on the RoR?

• E_K of particles increases and particles move faster

• so a higher proportion of particles have an energy at/above the E_A

• so there is a higher frequency of successful collisions

• so RoR increases

what is the effect of decreasing the temperature on the RoR?

• E_K of particles decreases and particles move more slowly

• so a lower proportion of particles have an energy at/above the E_A

• so there is a lower frequency of successful collisions

• so RoR decreases

what is the effect of increasing the pressure on the RoR?

• particles are closer together

• so increases frequency of successful collisions

• so RoR increases

what is the effect of decreasing the pressure on the RoR?

• particles are further apart

• so decreased frequency of successful collisions

• so RoR decreases

what is the effect of increasing the concentration on the RoR?

• more particles available to collide in a set volume

• more particles w/ an energy at/above the E_A

• so increased frequency of successful collisions

• so RoR increases

what is the effect of decreasing the concentration on the RoR?

• fewer particles available to collide in a set volume

• fewer particles w/ an energy at/above the E_A

• so decreased frequency of successful collisions

• so RoR decreases

what effect does a catalyst have on the RoR?

• lowers the E_A and provides an alternative reaction pathway

• so more particles have an energy at/above the E_A

• so frequency of successful collisions increases

• so RoR increases