Chemical Kinetics — Important Questions

Temperature, Concentration of reactants, Presence of catalyst, Surface area of solid reactants

Temperature increases molecular motion, higher concentration increases collision frequency, catalysts provide alternate pathways with lower activation energy, and larger surface area increases contact between reactants.

True

For first order reactions, t₁/₂ = 0.693/k, which depends only on the rate constant k, not on initial concentration [A]₀.

Zero order → Rate independent of concentration

Each order has distinct characteristics: zero order shows constant rate, first order is directly proportional to concentration, second order is proportional to square of concentration, and pseudo-first order occurs when one reactant is in excess.

Minimum energy required for reaction to occur

Activation energy is the minimum kinetic energy that colliding molecules must possess for a successful reaction to occur.