CH 222 Chapter Guides

Chapter Guide Three: Overview | Resources | Practice

  Overview of Chapter Guide Three

Chapter 5 introduces us to enthalpy, ΔH, one of the thermodynamic properties we will be exploring this year. Generally, if a reaction is exothermic (heat releasing), the reaction will occur naturally; conversely, if a reaction is endothermic (heat absorbing), the reaction will not occur without outside stimulus (i.e. adding heat.) We will use values of enthalpy to calculate enthalpies of reaction using Hess's Law and calorimetry.

For a complete list of important concepts in Chapter 9, see the Chapter 9 Study Guide.

  Resources for Chapter Guide Three

For this module, you should read Chapter 9 in your textbook.

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

The Chapter Nine 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 222 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 Nine. 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 Nine 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. Energy, Heat and Work
  2. Energy, Heat and Work - Word Problems
  3. Heat and Temperature Changes for Water
  4. Heat Transfer - Water
  5. Heat Transfer - Two Samples of Water
  6. Heat Transfer - Water and Another Substance
  7. Hess's Law
  8. Thermochemical Equations
  9. Using Heats of Formation

  Practice the Concepts of Chapter Guide Three

Complete problem set #3 to further explore organic chemistry. Problem set #3 covers several questions from Chapter 9 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 #3 (with answers included at the end) and/or the non-assigned problems in Chapter 9. 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 #3 (with answers at the end) which was given during a previous year's CH 222 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 9. 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!