3. Reaction Rates How we measure rates.
Rate Laws
How the rate depends on amounts
of reactants.
Integrated Rate Laws
How to calc amount left or time to
reach a given amount.
Half-life
How long it takes to react 50% of
reactants.
Arrhenius Equation How rate constant changes with T.
Mechanisms
Link between rate and molecular
scale processes.
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4. Assumptions
1- For a reaction to take place reactant
molecules must collide
A B AB
Collision of A and B
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5. The colliding molecules must collide with
proper orientation
AB + CD ---- AC + BD
A ----- C
----- A C + B D
B ------ D
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6. In order to make the collisions fruitful,the
colliding molecules must possess sufficeint
energy to collide otherwise the reaction will
not occur
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7. Transition state theory (TST) describes a
hypothetical “transition state” that occurs in
the space between the reactants and the
products in a chemical reaction. The species
that is formed during the transition state is
known as the activated complex.
AB + CD---- A ---- C --- AC+BD
B----- D
Activated Complex
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