chemical kinetics Flashcards
The factors such _________ affect the
rate of a reaction
as concentration, temperature, pressure and catalyst
Rate of disappearance of R
Decrease in concentration of R /Time taken t
Average rate depends upon the change in ___________ of reactants or products and the time taken for that change to occur
concentration
Rate of appearance of P
Increase in concentration of P/ Time taken t
what is rate law
the rate of a chemical reaction at a given temperature may depend on the concentration of one or more reactants and products. The representation of rate of reaction in terms of concentration of the
reactants is known as rate law. It is also called as rate equation or rate
expression. Rate = k [A]^x [B]^y
Units of zero order rate constant
Mol L^1/ s (or) 1/ (Mol L ^1)^0 (or) Mol L^1 s^1
what is elementary reaction
The reactions taking place in one step are called elementary reactions
what is the order of reaction
the sum of powers of the concentration of the reactants in the rate law expression is called the order of that chemical
reaction.
what is complex reactions
When a sequence of elementary reactions (called mechanism) gives us the products, the reactions are called complex reactions
Units of first order rate constant
Mol L^1/ s (or) 1/ (Mol L ^2)^1 (or) s^1
what is Molecularity of a Reaction
The number of reacting species (atoms, ions or molecules) taking part in an elementary reaction, which must collide simultaneously in order to bring about a chemical reaction is called molecularity of a reaction
Units of second order rate constant
Mol L^1/ s (or) 1/ (Mol L ^2)^2 (or) mol^1 L s^1
what is called the rate determining step
the overall rate of the reaction is controlled by the slowest step in a reaction called the
rate determining step
