CH 221 Chapter Guides

Chapter Guide Five: Overview | Resources | Practice


  Overview of Chapter Guide Five

This module has two portions. The first portion (covered in Chapter Three and Chapter Four) extends our discovery of solution type from module four and expands to reach solution stoichiometry. The second portion (Chapter 5) examines the role that energy plays in a chemical reaction (and how we can manipulate energy to get desired products).

Chapter 3 and Chapter 4 continue our discussion on types of reaction. You should be familiar with all five types: precipitation, acid-base, gas-forming, combustion, and oxidation. We will also explore oxidation numbers in order to ascertain if a reaction occurs with a transference of electrons. We will explore the concepts of acids and bases, and we will know how the concept of electrolyte helps us understand if an acid or base is "strong" or "weak". We will also extend our stoichiometry studies from Chapter 3 and Chapter 4 with a look at solution stoichiometry, especially when applied in a titration.

For a complete list of important concepts in Chapter 4 (and Chapter 3), see the Chapter 4 Part II Study Guide.

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 5, see the Chapter 5 Study Guide.


  Resources for Chapter Guide Five

For this module, you should read Chapter 3, Chapter 4 and Chapter 5 in your textbook.

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

The Chapter Four Part II Lecture notes and Chapter Five Lecture notes which accompany this lesson will be helpful to you when going through this section. These are Web versions of the notes I use in my "normal" CH 221 class and should let you see what is important to me in this chapter.

A variety of handouts are available from Chapter Four Part II and Chapter 5. 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 Four Part II Concept Guide and the Chapter Five 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 me to receive extra credit.

  1. Mixing Soluble Salts
  2. Oxidation Numbers
  3. Identifying Redox Components
  4. Molarity, Moles and Volume
  5. Molarity, Mass and Volume
  6. Dilution
  7. Energy, Heat and Work
  8. Energy, Heat and Work - Word Problems
  9. Heat and Temperature Changes for Water
  10. Heat Transfer - Water
  11. Heat Transfer - Two Samples of Water
  12. Heat Transfer - Water and Another Substance
  13. Hess's Law
  14. Thermochemical Equations
  15. Using Heats of Formation

  Practice the Concepts of Chapter Guide Five

Please complete problem set #5 to further explore the molecule and compound concepts. Problem set #5 covers several questions from Chapter 4 Part II and Chapter 5, 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 #5 (with answers included at the end) and/or the non-assigned problems in Chapter 4 and Chapter 5. 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 4 Part II and the self quiz for Chapter 5. These are ungraded tests that you can use to gauge your comfort level with these concepts. This sample Quiz #5 (answers) (which was given during a previous year's CH 221 class) will help you understand the kind of questions that will be asked on the quiz


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