WebLecture: Reaction Mechanisms

Kotz and Triechel, Chemistry and Chemical Reactivity Chapter 14: Sections 5-6.

1. 14.5 For a reaction to occur, the reacting molecules molecules must not only have sufficient kinetic energy of motion (activation energy E_a), they must also collide effectively. The rate of a reaction depends not only on temperature, where heat energy supplies the kinetic energy for the collision, but on the shape of the molecules, and the frequency of effective collisions.
2. 14.6 A reaction mechanism may involve multiple reactions between initial reactants and their intermediate products to produce the final products of the overall reaction. The rate of a multiple-step reaction will be constrained to the rate of the slowest reaction step.

Videos for Chapter 14: The Rates of Chemical Reactions

Review the Videos at Thinkwell Video Lessons.

• Under "Chemical Kinetics"
  • Temperature and Rates
    • The Collision Model
    • The Arhennius Equation
  • Reaction Mechanisms
    • Determining the Rate Laws of Elementary Reactions
    • Calculating the Rate Laws of Multiple Step Reactions

Homework problems: See your Moodle assignment!

AP #11 GUIDED INQUIRY — Titration Methods — Phase II

Carry out the steps you outlined for one of your identified solutions. Based on your experience, adjust any procedures or data collection methods to increase your accuracy with your second solution, then analyze the second solution.

Resources:

• AP2009 11 Determination of appropriate indicators for various acid-base titrations pH determination
• APGIE Investigation 8 Redox Titrations: How Can We Determine the Actual Percentage of H2O2 in a Drugstore Bottle of Hydrogen Peroxide?
• HSCKM V-1 Determine the Effect of Concentration on pH and the pH Range of Indicators
• HCSKM V-2 Determine the Molarity of Vinegar by Titration
• IGHCE Lab 11.1 Concentration effects on pH
• IGHCE Lab 11.2 pH in salt solutions

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