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Chemistry 14: 3-4

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Orders of Reaction and Concentration

Chapter 14: 3-4 Homework

Reading Preparation

Textbook assignment: Read Kotz and Triechel, Chemistry and Chemical Reactivity Chapter 14: Sections 3 and 4.

Study Notes

Key Formula

Order Rate Law Integrated Equation
Zero Δ R Δ t    =   k [ R ] 0   [ R ] 0     [ R ] t   =   kt
First Δ R Δ t    =   k [ R ] ln   [ R ] t [ R ] 0   =   kt
Second Δ R Δ t    =   k [ R ] 2 1 [ R ] t   1 [ R ] 0    =   kt
Half-life law t ½   =   0.693 k k: rate
0.693: -ln 1/2 = ln 2

We can do a quick graphical analysis as well. If we make three graphs, and plot [R], ln[R], and 1/[R] against time, the graph which gives us a straight line tells us what the reaction order is for the reactant R.

Web Lecture

Read the following weblecture before chat: How Concentrations Affect Rates

Study Activity

Videos for Chapter 14: The Rates of Chemical Reactions

Review the Videos at Thinkwell Video Lessons.

  • Under "Chemical Kinetics"
    • Orders of Reactions
      • First-Order Reactions
      • Second-Order Reactions
      • A Kinetics Problem

Review the Videos at Thinkwell Video Lessons.

  • Under "Chemical Kinetics"
    • Reaction Rates
      • An Introduction to Reaction Rates
      • Rate Laws: How the Reaction Rate Depends on Concentration
      • Determining the Form of a Rate Law

Use the Rates of Reactions Simulation Rates of Reactions Simulation to explore Multiple Collisions.

  • Accept the default initial scenario.
    • Pump A and BC molecules into the container.
    • Raise the temprature until the total average energy is just below the peak potential energy. Do any reactions occur?
    • Raise the temperature above the peak potential energy temperature. What happens?
  • Use the drop down menu under initial conditions to chose a different reaction. Vary the initial temperature and time how long it takes for the reaction to run to completion at higher or lower temperatures. How does temperature affect the reaction rate?

Chat Preparation Activities

Chapter Quiz

(Aligns to) AP #11 GUIDED INQUIRY — Titration Methods — Phase I

Design an experiment that uses titration methods to determine the concentration of an unknown solution. You will need to analyze data from a oxidation-reduction (redox) reaction and determine solution concentrations for at least two different solutions.

Identify the equipment and materials you will need, the solutions you will analyze, and outline the steps you will follow to collect data.