Please Pick Up Course Packet

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Please Pick Up Course Packet

• Course Syllabus
• Examination Objectives
• Competency Quiz Sheets
• Data Tables
• Problem Sets
• Periodic Table

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Chemistry 202

• Edward A. Mottel
• Department of Chemistry
• Rose-Hulman Institute of Technology

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About Me

• Edward A. Mottel
• Department of Chemistry
• F-111
• x8315

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Goals of the Course

• Thermochemistry
• Equilibria
• Acid-Base Reactions
• Electrochemistry

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Requirements

• Laboratory
• Chem 202 Laboratory Manual
• An Introduction to Experimental Chemistry (same
  as CHEM 201)
• Safety Goggles (Voucher from Bookstore)
• Quadrille ruled bound laboratory notebook
• Pen
• Proper Attire

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Course Syllabus

• Course grade depends on
• Three Exams
• Final Exam
• Competency tests and quizzes
• Problem Sets / Assignments
• Laboratory Notebook Reports

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Activation Energy

• Edward A. Mottel
• Department of Chemistry
• Rose-Hulman Institute of Technology

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Activation Energy

• Reading assignment
• Chang Chapter 15.4
• This lecture continues a discussion of the
  factors that affect the rate of a chemical
  reaction.
• The topic of activation energy is introduced
  along with the Arrhenius equation.

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Reaction Rate
Factors that affect the rate of reaction
catalyst
particle size
temperature
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Oatmeal
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Reaction Coordinate DiagramCollision Theory
For a chemical reaction to occur, the
reactants must collide successfully with enough
energy to overcome the activation energy (Ea).
Ea
DH
If the products are more stable than
the reactants, DH lt 0, the reaction is
exothermic.
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Reaction Coordinate DiagramCatalyst
Why does the rate of reaction change when a
catalyst is added?
Why does DH for the reaction stay the same?
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The Rate Constant
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Arrhenius Equation Factors Affecting the Rate of
Reaction
The Arrhenius equation allows the rate of a
reaction to be calculated at different
temperatures.
Rewrite the Arrhenius equation in straight line
form.
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Arrhenius EquationLinear Form
-Ea/R
ln (Rate Constant)
Inverse Temperature (K-1)
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Arrhenius Equation
The rate constant for a chemical reaction is 4.0
x 10-4 s-1 at 280. K and 2.0 x 10-3 s-1 at 300. K.
What is the activation energy of this reaction?
What rate constant would be expected at 320. K?
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Problem Set Activation Energy
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Boltzmann Distribution
The rate of many organic chemical reactions
double with every 10 degree change in temperature.
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Reaction Rates vary with Temperature
If you run a fever of a 103 F, how much faster
is your body running, than at a normal
temperature?
17 faster
The rate of many organic chemical reactions
doubles with every 10 degree Celcius change in
temperature around room temperature.
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