Reaction Kinetics

Question 1

Rate equation

Answer 1

The rate equation is an experimentally determined equation that relates the rate of reaction to the concentration of the reactants raised to appropriate powers

Question 2

Order of reaction wrt reactant

Answer 2

Is the power on its concentration term in the rate equation. The order of reaction is determined experimentally

Question 3

Overall order of reaction

Answer 3

Is the sun of individual orders

Question 4

Rate constant k

Answer 4

Is the proportionality constant in the experimentally-determined rate equation. It is a constant at a given temperature

Question 5

Half life (t 1/2)

Answer 5

Half life of a reaction is the time taken for the concentration of a reactant to decrease to half its initial value

Question 6

Half life formula for overall first order reaction

Answer 6

t1/2 = ln2/k

Question 7

Rate-determining step

Answer 7

Is the slowest step in a multi-step reaction with the highest activation energy

Question 8

Catalyst

Answer 8

A catalyst is a substance that speeds up a chemical reaction by providing an alternative reaction pathway of lower activation energy while remaining chemically unchanged at the end of the reaction

Question 9

Homogenous catalyst

Answer 9

A homogenous catalyst acts in the same phase as reactants and is uniformly mixed with them

Question 10

Heterogeneous catalyst

Answer 10

Acts in a different physical phase from reactants

Question 11

Rate of reaction

Answer 11

Is defined as the change in concentration of a reactant or a product per unit time