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 Friday, March 4 meet with your group to assign responsibilities for the preliminaray research. Then you will gather again 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). Alternatively, group members can agree to provide various different samples of bottled water.
The project involves some preliminary research so you will want to gather before the assignment due date to assign those responsibilities.
The group will meet at a mutually convenient
time (and place) to do a "taste
test". You may do this during class time on the 4th or some earlier time that is conveninet for all.
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 12 NOON, Friday, March 4, 2011.
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 March 21
.
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, March 25. Be prepared for a quiz on naming ionic compounds on Monday, March 28.
Three-Dimensional
Representations of Molecules - CT 5.21 on the CiC
Web site - During the week of March 21 we'will examine the three-dimensional representations of a number of covalent molecules. Check out the ones on the CiC
Web sometime duringbetween March 21 3 and March 28.