a) What do you mean by order and molecularity? b) i) Write two factors influencing rate of a reaction.

Question

The terms order and molecularity are common in chemical kinetics.

a) What do you mean by order and molecularity?

b) i) Write two factors influencing rate of a reaction.

ii) Write Arrhenius equation.

Answer 1

a) Order of a chemical reaction is the sum of powers of the concentration of the reactants in the rate law expression.
Molecularity of a reaction is the number of reating species (atoms, ions or molecules) taking part in an elementary reaction, which must collide simultaneously in order to bring about a chemical reaction.

b) i) Temperature, Nature of the reactant, Concentration of the reactant (Pressure in the case of gases). Presence of catalyst, Presence of radiation/light, Surface area etc.

ii) k=Ae\(\frac{-E_0}{RT}\) OR ln k=−\(\frac{E_a}{RT}\) + lnA