CH 223 Chapter Guides

Chapter Guide One: Overview | Resources | Practice

  Overview of Chapter Guide One

Chapter 12 introduces us to entropy, ΔS . We shall discover that the directionality of a reaction (i.e. does it occur? will products form?) is related directly to the disorder of a reaction, otherwise known as its entropy. We shall combine enthalpy, ΔH, with entropy to see if reactions occur or not. We will also learn of a new thermodynamic quantity, Gibbs Free Energy, ΔG. Of all the thermodynamic quantities, Gibbs Free Energy dictates if a reaction will occur or not, and we know this by the sign of ΔG.

For a complete list of important concepts, see the Chapter 12 Study Guide

  Resources for Chapter Guide One

For this module, you should read Chapter 12 in your textbook.

The following screencasts and Complete Lectures might prove useful to you as you study this chapter.

The Chapter Twelve lecture notes which accompany this lesson will be helpful when going through this section. These are Web versions of the lecture notes used in the "normal" CH 223 class and should let you see what is important in this chapter. You can also view the Lecture Notes in presentation software: Keynote, PowerPoint

A variety of handouts are available from Chapter Twelve. Feel free to explore all of them or just the ones which give you difficulty.

Once you have mastered the concepts listed above, check out the Chapter Twelve Concept Guide for a series of worked problems relating to this chapter. They will help you to ensure the mastery of the knowledge from this chapter.

Finally, test yourself (and get extra-credit in the bargain!) on the following chemistry concepts. If you get 9 out of 10 correct (or some multiple thereof), submit the information to receive extra credit.

  1. Second Law Problems
  2. Using Free Energies

  Practice the Concepts of Chapter Guide One

Complete problem set #1 to further explore the idea of chemical equilibrium. Problem set #1 covers several questions from Chapter 12, and it can be found here. We will discuss problems like these during recitation, so come prepared to ask and answer questions.

For additional practice, try completing practice problem set #1 (with answers included at the end) and/orthe non-assigned problems in Chapter 12. Answers to many of those problems are listed in the back of your textbook.

If you need assistance on these problems, you have several options. You can visit the AVID / Learning Success Center located above the MHCC library on the Mt. Hood Community College campus; they have tutors available to help you with your chemistry homework. You can also contact me if you have any questions.

This sample Quiz #1 (with answers at the end) which was given during a previous year's CH 223 class will help you understand the kind of questions that will be asked on the quiz.

You can also test your mastery of the subject matter by trying the self quiz for Chapter 12. This is an ungraded quiz that you can use to gauge your comfort level with these concepts.

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The Chapter Guides:

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Questions? Contact me!