Rates Flashcards
(14 cards)
zero order
the concentration of the reactant has no impact on the rate of reaction
first order
the rate of reaction is directly proportional to the concentration of A
r=k[A]
second order
the rate is proportional to the concentration of A squared
r=k[A]^2
when does k increase
only if temperature is increased, otherwise it is fixed
why is a measure of initial rate preferable
we know the concentrations of reactants
how does a pseudo-zero order occur
when the concentration of one reactant is so large that it remains relatively constant
how to apply rate equation to a graph of log rate vs log [Y]
y=mx+c
log rate=log k + n log [Y]
where rate=k[Y]^n
arrhenius eqn in terms of ln K
ln K= ln A- Ea/RT
units in arrhenius eqn.
R- JKmol-1
Ea- J (may need to convert)
on a graph of 1/T vs ln (rate) what is Ea equal to
Ea= -gradient xR
name for slowest step of a reaction
rate-determining step
how can you tell the order of reactants from RDS
how many moles of each reactant in RDS is its order
ie. 2 moles of C in RDS means C is 2nd order
how to find the order of reactants which are not in the RDS
sub them into the equation
what does SN2 stand for
substitution nucleophilic 2 molecules in RDS
