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750 DAY 2b --Chemical Stability And Kinetics Exam Study Guide
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750 DAY 2b --Chemical StabilityAnd Kinetics Exam Study Guide
Define kinetics - Answer the rate process of the drug happening before administration
-depends on molecularity (# of molecules reacting in the process)
Define reaction kinetics - Answer dc/dt (where dc= differential change, df= differential
time) study of the rate of chemical changes of drugs (rate/velocity of rxn)
Law of mass action - Answer The rate of a chemical reaction is proportional to the
product of the molar concentration of the reactants each raised to a power usually
equal to the number of molecules, a and b, of the substances A and B undergoing
reaction
A higher k values indicates a ___ rxn - Answer faster
Zero order rxn formula - Answer C= C0- K0t
Zero order reactions are dependent/independent of conc - Answer independent of the
concentration of the reactants and is CONSTANT with time
Define half life - Answer the time required for a drug to decompose to 1/2 of the original
conc; the time at which A has decreased 1/2[A]
half life formula for zero order rxn - Answer t1/2= [A]0/2K0
takes 2 Half lives for the complete degradation for ONLY zero order
define shelf life - Answer the time required for 10% of the drug to break down
the time at which [A] has decreased to 90% of its original conc
Expressed by t90
shelf life eq for zero order rxn - Answer t(0.9)= 0.1[A]0/k0
first order rxn is dependent on what? - Answer the REMAINING concentration of the
drug (therefore we use LnC)
formula for the first order rxn - Answer Ln C= LnC0 - K1t
differential equation
t1/2 of first order rxn is ____ on initial conc - Answer independent
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