General
Information: As you noticed in the last chapter, much of the
material in Chapter 5 lends itself to developing algorithms for solving
problems and highly provocative discussions. We will solve some "number
crunching" problems and consider two of these "provocative issues" in
particular. You will be abel to find much material on water pollutants,
water purification and water resources on the Web. This page was
prepared to serve as a launch point as you prepare for the group discussion
questions. You will find helpful material on the Chemistry
in Context Site as well as on the External Links page. Use the The Pitt University
Library on-line data bases and the web resources starting at theChemistry in
Context Site as your resources. Remember to document your
sources on any group or individual work you turn in for a grade.
Consider This 5.1 - 5.4 "The Water that we Drink" Water is essential to all living creatures. Human being drink a lot of water. Have you thought about the water that you drink? How pure is it? Where does it come from? Are you one of those people who prefers bottled water? Is it really better? Sometime before Wednesday, November 5 meet with your group to investigate the quality of water - from the tap and from a bottle.
You will need to do some preliminary research:
Appoint a Manager, a Recorder and two Resources Managers.
With "financial assistance" from the other group members, the Resource Managers will purchase one bottle each of two or more different brands of bottled water. The Resource Managers will also be responsible for providing paper cups, a source of tap water and filtered water (if available).
The group will meet at a mutually convenient time (and place) to do a "taste test".
Assign a Recorder and a Manager. The Recorder will keep a record of the group's opinions and answers to the questions.
Test the bottle water samples.
You will also evaluate tap water
Test a sample of filtered water, as well, if that is available.
Use the questions on the group work sheet.
Be sure everyone has a cup!
Combine the information gathered from CT 5.3 & CT 5.4 to answer the additional questions on the worksheet.
Be sure to complete the Group Assessment!
The completed assignment is due in class, Wednesday, November 5, 2008.
Have Fun!
Contaminants in your Drinking Water - Drinking water - that comes from the tap - is generally pure. But some contaminants can be very harmful. Section 5.13 explores lead. Waht about cadmium, mercury and arsenic? After reading section 5.13, research these using CT 5.30, 5.32 and 5.34 and write your answers as your journal entry for the week of November 3.
Ionic Compounds - We learned how to name simple chemical substances at the beginning of the term (back in Chapter 1). We've been expanding our understanding of ionic compounds in this chapter. This means you'll have to learn the names of the Common Polyatomic (more than one atom) ions found in Table 5.6 and the examples in Table 5.7 (p 213). As practice do YT 5.16 through YT 5.20 and YT 5.22. We will discuss these in class on Wednesday, November 5. For Homework, do problems 21- 29 at the end of Chapter 5. The problems are due Friday, November 7. Be prepared for a quiz on naming ionic compounds on Monday, November 10.
Three-Dimensional Representations of Molecules - CT 5.21 on the CiC
Web site - During the week of November 3 we' will examine the three-dimensional representations of a number of covalent molecules. Check out the ones on the CiC Web sometime duringbetween November 3 and November 10.