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RATE THEORIES
RATE THEORIES
1. Collision Theory
2. Transition State Theory
3. Catalysts
RATE THEORIES
COLLISION THEORY:
The rate of rxn is proportional to the number
of effective/successful collisions per second
between reactant molecules.
What factors determine whether reactants
could form a molecule?
(e.g. is bumping into each other enough?)
Not all collisions are effective.
Effective collision: A collision that actually results in
the production of product molecules
In a game of pool, what are the two conditions
that are required for an effective collision?
RATE THEORIES
COLLISION THEORY:
8
3
WRONG ORIENTATION
RATE THEORIES
COLLISION THEORY:
Not all collisions are effective
3
CORRECT ORIENTATION!
8
RATE THEORIES
COLLISION THEORY:
3
INCORRECT SPEED!
8
RATE THEORIES
COLLISION THEORY:
Not all collisions are effective
3
CORRECT SPEED!!!
8
RATE THEORIES
COLLISION THEORY:
8
SCORE
RATE THEORIES
COLLISION THEORY:
For a collision to be effective, the molecules must
collide with the proper:
1)orientation
2)kinetic energy
RATE THEORIES
• Orientation: H2 + I2  2 Hl
COLLISION THEORY:
RATE THEORIES
• Orientation: NO + NO3  2 NO2
COLLISION THEORY:
RATE THEORIES
• Kinetic energy: A
minimum kinetic energy,
called activation energy
(Ea), is required between
reactants for a reaction to
proceed.
– Ea is unique to each
reaction
Higher temperatures result
in a higher percentage of
reactants with enough
energy to react.
COLLISION THEORY:
RATE THEORIES
• Kinetic energy:
COLLISION THEORY:
RATE THEORIES
• Kinetic energy:
COLLISION THEORY:
numberofparticles
energy
Only a fraction of the
reactant molecules
collide with enough
kinetic energy
RATE THEORIES
COLLISION THEORY:
Factors affecting effective collisions:
1. molecule orientation
2. molecule energy
Collision Theory Animation
Collision Theory Applet
RATE THEORIES
COLLISION THEORY:
To rate of reaction, the frequency of collisions or the fraction of↑
effective collisions must be increased
Factors that Increase Frequency of Collisions:
-Concentration
-Surface Area
-Temperature
Factors Increase Fraction of Effective Collisions:
-Nature of Reactant
-Catalyst
-Temperature
We have discussed
these factors before
RATE THEORIES
TRANSITION STATE THEORY:
Potentialenergy
Reaction coordinate
Potential energy diagrams
Reactants
Products
Ea
ΔH
The transition state
complex (or activated
complex) is formed at
this peak
RATE THEORIES
TRANSITION STATE THEORY:
Potential energy diagramsPotentialenergy
Reactants
Products
Ea
ΔH
The transition state
complex (bonds break
and form at the same
time)
RATE THEORIES
TRANSITION STATE THEORY:
The transition state complex (bonds break and form at the same time)
RATE THEORIES
TRANSITION STATE THEORY:
Potential energy diagrams
RATE THEORIES
TRANSITION STATE THEORY:
Potentialenergy
Reaction coordinate
Draw the potential energy diagram for the reverse reaction
Reactants
Products
Ea
ΔH
RATE THEORIES
TRANSITION STATE THEORY:
Examine the Ea for both reactions. What does
that suggest?
Ea is different between the forward and reverse
directions of a given reaction.
Generally, endothermic reactions are slower than
exothermic reactions due to a higher Ea.
RATE THEORIES
TRANSITION STATE THEORY:
1. Identify Ea, ∆H and transition state.
2. What are the values of Ea and ∆H? 50kJ, -100kJ
3. Endothermic or exothermic? Exothermic
4. What are Ea and ∆H for the reverse rxn? 150kJ, 100kJ
RATE THEORIES
CATALYST:
catalyst - a substance that increases the rate of a
chemical reaction without being consumed
homogeneous catalyst - exist in the same phase as
the reactants
heterogeneous catalyst - exist in a different phase as
the reactants
RATE THEORIES
CATALYST:
Catalysts lower the Ea of a reaction
RATE THEORIES
CATALYST:
Catalysts lower the Ea of a reaction
RATE THEORIES
CATALYST:
Catalysts:
• bend or stretch bonds to make
them easier to break / react
• reduce EA (make transition state
easier)
• bring two reactants close together
• provide a microenvironment for
reactions
RATE THEORIES
CATALYST:
Inhibitors - bind with the reactant or the catalyst to
prevent the reaction from occurring and reducing
reaction rate

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Notas do Editor

  1. http://www.saskschools.ca/curr_content/chem30_05/2_kinetics/kinetics2_1.htm http://www.kscience.co.uk/animations/collision.htm
  2. http://www.saskschools.ca/curr_content/chem30_05/2_kinetics/kinetics2_1.htm http://www.kscience.co.uk/animations/collision.htm