The Benign Hamburger | Hommers Mining Dilemma | A Case in Point
The Bridge of Mandolin County
|
Well Wishes
Synopsis:
Jill-at-the-Grill hamburger fast food chain must decide the future of their company. A recent outbreak of E. coli bacteria in hamburgers sold in their restaurants has resulted in at least one death and over two hundred reported cases of food poisoning. The company CEO has assembled all his top aides for an emergency meeting to update the situation and decide what steps the organization should take to reverse the economic plunge company stock has taken in the last few days. They are considering introducing irradiated beef into their products to prevent another such catastrophe and to restore the publicâs confidence in their restaurants. Concern about the safety of the irradiated food and the publicâs acceptance of this process is brought forth.
Case Objectives:
develop critical thinking
skills and learn to support arguments and opinions with
facts, apply risk-benefit
analysis principles
This case was developed for use as an introduction to nuclear applications aside from those involving nuclear power generation and weapons. As such, it can be used in a variety of introductory science courses.
Environmental Chemistry,
Environmental Science
Topics that would be
especially appropriate for this audience include the difference between
various nuclear technologies (food irradiation, power plants, bombs) and
the safety of any nuclear facility. The discussion could focus on the level
of scientific literacy necessary to function as a responsible citizen, world
food supplies and food preservation technologies, government regulatory
functions, and the harmful effects of various radiation dosages.
Introductory Biology Topics that would be especially appropriate for this audience include bacteria and the public policy issues related to food irradiation. The discussion could focus on bacterial infections, the role of bacteria in the human GI tract, the role of bacteria in food preservation technologies, the history of various epidemics, FDA regulatory policies, and the societal issues resulting from such a proposition.
Hommers Mining Dilemma
by Juliette Lantz and
Mary Walczak
appears in: J. M.
Lantz and M. M. Walczak,
The Elements of a Chemistry Case:
Teaching Chemistry
Using the Case Discussion Method,
Chem. Educator, 1(6), 1997, S 1430-1471 (97) 06070-6.
Synopsis:
A mining company in northern Wisconsin is faced with a dilemma. The copper ore that they have been mining is nearly depleted and the other ore on their site is of a fundamentally different type. This ore will require pyrometallurgical refining, as opposed to the hydrometallurgical processing that has been done with the other ore. The company founders explore possibilities of processing the ore on site cognizant of the environmental harm which may be inflicted. Since they are highly committed to preserving the environment, they explore options which minimize the environmental effects of refining. They must decide which course they will follow, and their decision will be made public in a press release scheduled to appear in the next day's news.
Case Objectives:
This case was written for a second semester general chemistry . However, as the analysis focuses on manipulating half-reactions to determine if a copper-producing reaction is spontaneous at 950°C, it could also be used in a variety of other courses where other aspects of the case could be emphasized.
Analytical or Physical
Chemistry
In an upper level analytical
or physical chemistry class, the students could be expected to progress
through the analysis more rapidly with little assistance. The class could
focus on the outcome of their decision on the surrounding town and businesses,
and on the mining industry itself. A physical chemistry class might do the
whole analysis in terms of free energy, while an analytical course might
stick solely to the use of cell potentials.
Environmental Chemistry,
Environmental Science, Introductory Geology
In environmental chemistry
classes the instructor might focus on the smelting as an origin of the acid
rain precursor, the nature and effects of heavy metal contamination, strip
mining vs. shaft mining, land reclamation, mine runoff, and a comparison
of hydrometallurgy and pyrometallurgy. With some adaptation, this case could
also be used in introductory geology or environmental science courses. Topics
to focus on for these courses include the environmental consequences of
ore removal from the earth and the regional nature of ore deposits.
A Case in Point
by Mary Walczak and
Juliette Lantz
J. Coll. Sci. Teaching,
28(3) 1998 152-57.
Get the
A Case in Point Case
and Case
Teaching Note
Synopsis:
A manager of a scientific consulting firm has approval to hire an entry level scientist. Since his group already covers the basic fields of science, he has the freedom to hire someone without having to fill a vacancy in a particular expertise. From the five applicant portfolios in front of him, the employer has pulled out the performance evaluation letters which have been written by faculty familiar with the students and their work. He must choose one applicant to invite for an interview later that week.
Case Objectives:
serve as an ice breaker
in the first week of class, to promote camaraderie and
group skills in the
classroom.
prepare students for
their next life transition, from college to a career. To help
students consider ways
to make themselves employable and competitive in the job market.
This case was developed to motivate students to participate in active learning activities. Although different goals apply, the case is equally applicable with upper and lower level students.
Upper Level
This case can also
be used to allow upper-level students to explore the transition from college
to a career, and help them translate their education experiences into marketable
skills. It can serve to inspire students to take a more active role in their
full educational endeavor, and to consider research, internships, independent
projects, etc. as activities that are vital to their professional development.
Synopsis:
The members of the Mandolin town council must decide how to budget for the deicing of the townâs new bridge which gives them direct and easy access to the nearest cityâs shopping and medical facilities. Two viable deicers, rock salt and calcium-magnesium-acetate (CMA) are considered, both of which make claims to be the more effective deicing product. The town council must examine these claims in detail from a chemical, economic and environmental standpoint, and appoint a task force to take on this assignment and make a recommendation.
Case Objectives:
compel students to gather information by experiment in
a laboratory setting,
and to bring their findings to bear upon their individual
deicer choices
This case was designed to be used early in the semester of a general chemistry course, as it covers chemical principles such as molar mass, ions and ionic equations in water, solubility rules and inorganic nomenclature. The case requires students to do a substantial amount of calculations and unit-conversion type problems. The case is intended to be used over two class periods, with a laboratory period in between. A variety of laboratory exercises are provided; any combination of these is optional for this case. Due to the wide range of laboratory exercises, the focus on fundamental chemical principles and calculations and the overriding environmental themes, this case can successfully be used without adaptation in non-majors chemistry or environmental chemistry courses, or upper level analytical or environmental chemistry courses.
Laboratory Experiments:
Synopsis:
Standing water over a septic system drain field causes new homeowners to become concerned about the quality of their well water and the viability of their septic system. Upon testing the well water, they find it contains high levels of nitrate, a species known to cause health problems. The amount of nitrogen generated daily by the household (as measured in the septic system effluent) is the basis of the case analysis. Students convert all nitrogen-containing species to nitrate and account for groundwater and aquifer dilution. After comparing the measured well water nitrate levels with calculated values, the septic system can be either ruled out or identified as the source of hazardous nitrate levels in the well water. Based on this analysis, the homeowners must find a way to improve the quality of their well water and determine whether their septic system needs to be modified or replaced.
Case Objectives:
This case is designed for use in general chemistry to develop the concepts of solution concentrations and solution stoichiometry, aqueous redox reactions, and the carbon and nitrogen cycles in wastewater. Optional lab exercises involving water analyses for nitrate and chloride are included, along with suggestions for making these experiments role-playing exercises. This case can be used over 2-5 class periods and 0-2 lab periods. Suggested variations combining two, one or no lab components are provided. Due to its challenging analysis and environmental focus, this case can also be used without alteration in analytical or environmental chemistry. It is also appropriate for courses intended for non-science majors.
Laboratory Experiments:
The Benign Hamburger | Hommers
Mining Dilemma | A Case in Point
The Bridge of Mandolin County
|
Well Wishes
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