L5 -7 handouts

Question 1

how to use integration method to obtain rate laws from experimental data

Answer 1

use the integrated time law if first or second order
plot data
if they lie on a line, you can find k

Question 2

what is isolation method

Answer 2

have all things in excess apart from one and the rest become constants in keff until mi of all compounds is found

Question 3

what is method of initial rates

Answer 3

when finding m (order in k[A]^2 the power situation) and rate constant k
measure start concentration and initial rate then repeat experiment with new pair

Question 4

what to do if more than 2 data pairs are measured for method of initial rates

Answer 4

take a logarithm of both sides

plot a linear graph with intercept ln k and slope m

Question 5

what is arrhenius equation

Answer 5

Aexp(-EA/RT)

or ln k(T) = ln A - EA/RT

Question 6

what is A in Arrhenius equation

Answer 6

pre exponential factor or frequency factor

Question 7

EA in arrhenius equation

Answer 7

activation energy

Question 8

units for activation energy

Answer 8

J mol ^-1

Question 9

unit for pre-exponential factor

Answer 9

same as units for k

Question 10

how to determine arrhenius parameters

Answer 10

plot on a graph ln k(T) as y and 1/T as x the ln version
intercept in lnA
slope in -EA/R

Question 11

what if the arrhenius parameters graph is curved

Answer 11

take a tangent and the parameters are valid at that temperature