6.2 kinetics vs termodynamics

Question 1

what is standard free nrg delta G⁰

Answer 1

diff btwn nrg of reactants (initial state) and nrg of products (final state)

Question 2

can enzymes alter the K_eq or free enegy change

Answer 2

no the speed up rxns by lowering activation nrg delta G^o+(dagger), this is the energy input required to initiate the rxn

Question 3

why is the rate of an uncatlayzed rxn slower than a catalysed rxn

Answer 3

activation nrg for an uncatlyzed rxn is higer than catalyzed; an uncatylzed rxn required more nrg input to initiate the rxn

Question 4

rxn of glucose and oxygen gas to produce CO2 and water requires enzymes?

Answer 4

yes. the rxn is sponatneous, thermodynaically favourable b/c its free nrg chane is -ive

Question 5

what is the transition state

Answer 5

the max curve connecting the ractants and products. activation nrg is required for alignemnt of reacting gropus, formation of unstable trainset charge, bond reaarangement and other transformations required for the rxn to preceed to the tranistion state

Question 6

Will a rxn go faster if you raise the temp? why or why not

Answer 6

yes, it increases the nrg available to the reactants to reach the trainstion state. thus, the rate of chem rxn increaases w/temp. however, there comes a point in which heat denatures enzymes. above this temp, more heat denatures enzyme and slows rate

Question 7

diff btwn thermodynamics and kinetics

Answer 7

thermodynamies refer to whether rxn is sponatneous (-ive free nrg). kinetics, how fast rxn occurs, rxn can have -ive delta G^o and still be slow

Question 8

how do enzymes speed up rxn

Answer 8

lowers activation nrg, this helps reactant anzyme attain transition state