AP Chem Unit 5

k unit for zero order

M/s

k unit for first order

s-1

k unit for second order

M-1 s-1

k unit for third order

M-2 s-1

increasing temperatures ________ collision rate

increases
bc it allows for more particles to reach the activation energy threshold

breaking particles into smaller pieces ______ collision rate

increases
bc it increases surface area

what do catalysts do?

provide a different reaction path that lowers the required activation energy

increasing molecularity _______ collision rates

decreases
bc it makes it harder to get the perfect collision

endothermic

products are at higher energy level than reactants
uphill is endo

exothermic

products are at lower energy level than reactants
downhill is exo

which step in the mechanism has the highest activation energy?

slow step

what order is this graph?

zero order

half life formula

initial concentration/2^x = leftover concentration

what order is this graph?

first order

what order is this graph?

second order

what order is this graph?

zero order

what order is this graph?

first order

what order is this graph?

second order

what does the Arrhenius equation reveal?

K increases with increasing temperature
K decreases with increasing activation energy

zero order equation

[A]t – [A]0 = -kt

first order equation

ln[A]t – ln[A]0 = -kt

second order equation

1/[A]t – 1/[A]0 = kt