Topic 2b- kinetics (reaction mechanisms)

Question 1

Does reaction rate increase with temp

Answer 1

yes

Question 2

activation energy

Answer 2

minimum amount of energy required for reaction
-also known as the transition state on the graph

Question 3

what happens at activated complex/ transition state

Answer 3

reactants rotate into products

Question 4

bigger activation/ larger kj will be faster or slower?

Answer 4

slower

Question 5

arrhenius equation

Answer 5

ln k= -ea/RT + Ln A

-RT is 8.314 because kj

Question 6

how to find ea (activation energy)

Answer 6

-slope x R

Question 7

what are our indicators for arrhenius

Answer 7

temp and rate

Question 8

what is the actual process called going from reactants to products

Answer 8

reaction mechanism

-includes elementary reaction or elementary process

Question 9

molecularity

Answer 9

how many molecules are involved in the process (how many products: rate law exp, ratio count/amount of reactants)

-eg. unimolecular, bimolecular, thermomolecular

Question 10

when crossing out reactions between each step what do we need to make sure off

Answer 10

they are on opposite sides of the arrows and it determines intermediate

Question 11

Ea1 will always be _________ than E2

Answer 11

greater

Question 12

because thermomolecular are rare, this rate law suggests

Answer 12

two step reaction mechanism

Question 13

what determines the rate

Answer 13

slow step

Question 14

forward and reverse reactions (equilibrium) will have what step first

Answer 14

fast first

Question 15

if one element in step one isnt in step two, will it be included in OVERALL RATE LAW?

Answer 15

no

Question 16

relationship between forward and reverse

Answer 16

they are equal to each other

Question 17

SN1 and SN2 step

Answer 17

1: two step
2: one step

Question 18

catalysts increase what

Answer 18

the rate of reaction by decreasing activation energy

Question 19

catalyst productions

Answer 19

-efficient (drive reaction)
-cheap (abundant)
-abundant (available)
-robust (needs to work)

Question 20

enzymes

Answer 20

-bio catalyst
-lock and key method
-position in active site can help break down more

Question 21

rate limiting step isnt usually known, what do we use

Answer 21

steady state approx

Question 22

reaction rate steps

Answer 22

-write down formation of product
-determine intermediates
-find total rate of forming intermediate
-find total rate of consuming intermediate
-set the two rates equal and solve for [intermediate]
-sub into rate law from step one

Question 23

whats the formula for two point arrhenius

Answer 23

Ln k2/k1= -ea/R (1/t2 - 1/t1)