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Glossary of PCAT Chemical Kinetics and Equilibrium

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rate
rate =
decrease in concentration of reactants / time
or
increase in concentration of products / time
rate law
rate =
k[A]^x[B]^y
zero-order reaction half-life
half-life =
.5 Ao/Ko
first order reaction rate
rate =
k[A]
or
k[B]
first order reaction half-life
t(1/2) = .0693/k
equilibrium constant (K)
[B][C] / [A]^2
reaction quotient (Q)
Q =
[C]^c [D]^d / [A]^a [B]^b
irreversible reaction
only proceeds in one direction
reversible
can proceed in both directions
activation energy (Ea)
minimum energy of collision necessary for a reaction to take place

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