Question

which of the following statements about the chemical kinetics are true/

a) temperature has no effect on the rate of a reaction

b) changes in reactant concentration do not affect the rate at which a reaction occurs

c) the addition of a catalyst to a reaction will speed up the reaction but it will not ultimately result in a larger mass of product

d) for the same reactants, the larger the surface area, the slower a reaction will occur

why?

Answer 1

Ans a)False

Temperature Effects. Increasing thetemperature of a system increases the average kinetic energy of its constituent particles. Hence there action rate of virtually all reactions increases with increasing temperature.

Ans b)False

Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.

Ans c)True

The addition of a catalyst to a reaction will speed up the reaction but it will not ultimately result in the a larger mass of product. For the same reactants, the larger the surface area the slower a reaction will occur.

Ans d) False

The greater the rate or frequency ofsuccessful collisions , the greater the rate of reaction. If the surface area tovolume ratio of a reacting solid is increased: more reactant particles are exposed at the surface. the frequencyof successful collisions betweenreactant particles increases