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Chem 116 Exam review Questions & Correct Verified Answers
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Chem 116 Exam review Questions & Correct Verified Answers
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Chem 116 Exam review Questions &Correct Verified Answers
Molecule dissociate - unimolecular step - ✔✔A -> B + C
Molecularity - ✔✔number of particles needed to produce the elementary
Molecules collision - bimolecular - ✔✔A + B -> C + ....
Molecules collision - termolecular - ✔✔A + B + C -> D +.....
rate determining step - ✔✔slowest step in a reaction mechanism determines rate of overall
net reaction
intermediate - ✔✔product in a previous step; reactant in a later step; does not show in net rxn
Collision theory - ✔✔not every collision produces a reaction; for reaction to happen the collision
needs to be energetic and have right orientation
During collision K.E. -> P.E., which is higher - ✔✔P.E.
activation energy on a graph - ✔✔reactants to transition state (hump)
delta H on a graph - ✔✔reactants to products
delta H is greater than 0 - ✔✔endothermic
, delta H is less than 0 - ✔✔exothermic
highest peak is - ✔✔the rate-determining step
Arrhenius eq - ✔✔K = A e^(-Ea/RT)
Equilibrium - ✔✔reaction is at equilibrium when all reactant(s)/product(s) concentration are
constant with time
forward reaction ______ as _______ - ✔✔slow down as reactants decrease
reverse reaction ______ as ________ - ✔✔speed up as products increase
at equilibrium, forward rate ___ reverse rate - ✔✔=
forward rate equation - ✔✔kf [A]^a[B]^b = kr[C]^c[D]^d
equilibrium constant Kc - ✔✔kf/kr = [C]^c[D]^d/[A]^a[B]^b
what affects the equilibrium constant - ✔✔value of Kc is temperature dependent; value of Kc
not dependent on initial concentration of reactant(s)/product(s)
Kc > 10^3; [P] << [R] - ✔✔reaction almost 100% complete
Kc < 10^-3; [P] << [R] - ✔✔reaction hardly proceeds at all
Equilibrium constant expression excludes what - ✔✔liquid/solid reactant/product
Kp - ✔✔equil constant in terms of partial pressure for gas phase rxns
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