CH 222 Chapter Guides

Chapter Guide Four: Overview | Resources | Practice

  Overview of Chapter Guide Four

This module has two portions. The first portion (covered in Chapter Nine) explores the gas laws (centered around the Ideal Gas Law). The second portion (Chapter 10) explores the forces which keep molecules together, both in solution and by themselves.

Chapter 9 shows the myriad gas laws (Boyle's, Charles', Avogadro's, etc.) which all can be distilled down to the Ideal Gas Law. The so-called "evening dirt" equation (which is a derivative of the Ideal Gas Law to find molar mass) will also be used extensively. We shall discus diffusion, effusion, speeds of gases, and much more.

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

Chapter 10 introduces us to intermolecular forces, or the forces which keep molecules of the same compound together. Intramolecular forces (ionic, covalent and metallic) have been covered in previous chapters), while these intermolecular forces explain how two water molecules stay together. Typical IM forces include dipole-dipole, induced dipole - induced dipole (also known as London Dispersion forces), hydrogen bonding, ion-dipole, and several others. We shall rank the forces by strength to understand them and be able to assign the forces depending on the nature of the intramolecular bonds in the molecule.

For a complete list of important concepts in Chapter 10, see the Chapter 10 Study Guide.

  Resources for Chapter Guide Four

For this module, you should read Chapter 9 and Chapter 10 in your textbook.

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

The Chapter Nine lecture notes and Chapter Ten lecture notes which accompany this lesson will be helpful to you when going through this section. These are Web versions of the lecture notes I use in my "normal" CH 222 class and should let you see what is important to me in this chapter. You can also view the Lecture Notes in presentation software for Chapter 9 (Keynote, PowerPoint) and Chapter 10 (Keynote, PowerPoint).

A variety of handouts are available from Chapter Nine and Chapter Ten. 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 and the Chapter Ten Concept Guide for a series of worked problems relating to this module. They will help you to ensure the mastery of the knowledge from this section

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 me to receive extra credit.

  1. Boyle's Law
  2. Charles's Law
  3. Avogadro's Law
  4. Combined Gas Law
  5. The Ideal Gas Equation
  6. The Complete Ideal Gas Equation
  7. Dalton's Law of Partial Pressures
  8. Graham's Law
  9. Intermolecular Forces

  Practice the Concepts of Chapter Guide Four

Please complete problem set #4 to further explore the ideas of solubility and entropy. Problem set #4 covers several questions from Chapter 9 and Chapter 10, 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 #4 (with answers included at the end) and/or the non-assigned problems in Chapter 9 and Chapter 10. 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.

Test your mastery of the subject matter by trying the self quiz for Chapter 9. This is an ungraded test that you can use to gauge your comfort level with these concepts. This sample Quiz #4 (answers) (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.

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