13.3 Relation Between Reactant Concentration And Time

Question 1

Define half-life. Write the equation relating the half-life of a first-order reaction to the rate constant

Answer 1

Half-life: the time required for the concentration of a reactant to decrease to half of its initial concentration.

1st order: t=(1/k)•ln([A]o/[A]t) —> 0.693/k

2nd order: 1/([A]t) —> 1/(k[A]o)

0 order: ([A]o)/2k