handouts 1-3

Question 1

define chemical kinetics

Answer 1

deals with time-dependant chemical processes

how a system evolves far from equilibrium into equilibrium

Question 2

rule of thumb for temperature

Answer 2

is temp raised 5 degrees reaction rates double around room temp

Question 3

what does N stand for

Answer 3

number of molcules

Question 4

units for number of molcules

Answer 4

no units

Question 5

what does n stand for

Answer 5

number of mols

Question 6

what is unit for number of mols

Answer 6

mol

Question 7

what does c stand for

Answer 7

concentration

number of molecules per volume

Question 8

units for number of molecules per volume

Answer 8

m^-3
dm^-3
cm^-3

Question 9

what does C stand for

Answer 9

number of mols per volume

Question 10

what is unit for C

Answer 10

moldm^-3

Question 11

when is C and c define

Answer 11

in homogeneous reactions

Question 12

what does collision probability rely on

Answer 12

number density of the molecules

Question 13

are products or reactants negative stoicheometry

Answer 13

reactants

Question 14

why is change in mols not useful

Answer 14

different for every component

Question 15

how to find the amount of products and reactants

Answer 15

divide the change in mols at two different times by the stoichiometric coefficient

Question 16

what does xi stand for

Answer 16

extent of reaction

Question 17

what is the extent of the reaction equation

Answer 17

dxi = dni / vi

Question 18

what is rate of conversion equation

Answer 18

vxi = 1 / vi * dni / dt

Question 19

why not use rate of conversion for homogeneous reactions

Answer 19

because c or C are used and they are proportional to the number density of molecules

Question 20

what is differential rate law equation

Answer 20

k capital pi ci ^ mi
k is reaction rate constant
capital pi product operator (times all of them)
ci is all the different coefficients
mi is reaction order of each substance

Question 21

what does differential rate law equation find

Answer 21

reaction rate

Question 22

units of reaction rate constant

Answer 22

(dm^3 mol^-1)^(m-1) s^-1

Question 23

what is m

Answer 23

total reaction order

Question 24

define elementary reaction step

Answer 24

molecules on left come together to form right in side in one step
smallest unit of reaction mechanism

Question 25

what is molecularity

Answer 25

number of molecules on left in elementary reaction

Question 26

for unimolecular elementary reactions what are differential rate law equations look like A* = B

Answer 26

vc(t) = - d[A]/dt = d[B]/dt = k[A]

Question 27

what is units of k in unimolecular elementary reaction

Answer 27

s^-1

Question 28

how to solve differential rate law unimolecular

Answer 28

separate variables
integrate from c0 / t to c(t) / t
solve integral

Question 29

what is integrated rate law equation

Answer 29

c(t) = c0 exp(-kt)

Question 30

how to find conc of B at a time using integrated rate law

Answer 30

[A]0 - [A} = [A]0 - [A]0 exp (-kt)

Question 31

plotting graph for unimolecular reaction

Answer 31

plot ln(c(t)/c0) = -kt
t is x
y is (c(t)/c0)
the slope is -k