Kinetics

Question 1

The rate expression or equation shows the general relationship between the rate of a reaction and the concentrations of the constituent reactants

Answer 1

Rate = k[A]m[B]n

Rate = k[A]m[B]n

k is a constant, and m, n show the orders of the reaction with respect to each reactant.

Question 2

The order of reaction

Answer 2

The order of reaction with respect to a given reactant is the power of that reactant’s concentration in the rate equation.

Question 3

The overall order of reaction

Answer 3

The overall order of reaction is the sum of the powers of the reactant concentrations in the rate equation

Question 4

The rate constant

Answer 4

The rate constant is the constant of proportionality in the rate equation.

Question 5

The rate of a reaction

Answer 5

The rate of a reaction is the decrease in concentration of reactants per unit time, or the increase in concentration of products per unit time. The units of rate of reaction are moldm-3s-1.

Question 6

DETERMINING ORDERS OF REACTION

Answer 6

The orders of reaction with respect to each reactant in the reaction can be determined by carrying out the reaction with various different initial concentrations and measuring the change in initial rate of reaction. The orders of reaction can be determined arithmetically or graphically.

If the order of reaction with respect to one reactant is being determined, the concentration of one reactant only should change; the others should remain constant so that the change in rate can be attributed to the change in concentration of that reactant alone.

If the overall order is being determined, the concentration of all reactants should change by the same factor.

Question 7

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Answer 7

mm