Reaction Kinetics Flashcards
Rate constant ‘k’ and the absolute temperature T are related by collision theory (for bimolecular) as
k ∝ √T
The energy of activation of a chemical reaction
Definition: minimum energy which the molecules must have before the reaction can take place
Reactions with high activation energy are
very temperature sensitive
The equilibrium constant of a chemical reaction
remains unaffected in the presence of catalyst
In autocatalytic reactions
One of the product acts as catalyst
Arrhenius equation shows the variation of __________with temperature
rate constant
The reaction in which rate equation corresponds to a stoichiometric equation is called
Elementary reaction
Sum of the powers of the concentration terms in the rate equation is called the
overall order of chemical reaction.
Rate of chemical reaction is independent of the concentration of reactants for
Zero order
Rate determining step in a reaction consisting of a number of step in series is the
slowest step
Consider the reaction A + 2B → 3C. Which of the following statements is TRUE?
The rate of disappearance of A is a third of the rate of appearance of C
The reaction is termolecular
For a gaseous system in a closed container, which condition will increase the reaction rate?
Heat the container
Consider the conversion of ozone to oxygen using chlorine. What is the reaction order with respect to chlorine?
Global Reaction:
2O3>3O2
Using Chlorine:
Cl2+O3>ClO+ClO2
ClO+O3>ClO2+O2
ClO2+O3>ClO3+O2
ClO3+O3>ClO2+2O2
ClO3+ClO3>Cl2+3O2
chain carriers ClO ClO2 and ClO3 are assumed to attain pseudo-steady state then
rO3= k(Cl2)^1/2 (O3)^3/2
Answer: 1/2
Consider the conversion of ozone to oxygen using chlorine. What is the reaction order with respect to ozone?
rO3= k(Cl2)^1/2 (O3)^3/2
Answer: 3/2
