Web Activities
UNIT 3: ENERGY CHANGES AND RATES OF REACTION
Unit 3 – Performance Task and Review
p. 417
Question 28
The concept of half-lives can be applied to biological, as
well as chemical, systems. There is some concern that antibiotics, fed
to livestock to speed their growth by killing disease organisms, are
excreted in the animals’ urine, thereby contaminating ground water.
This rate of excretion appears to be a first-order reaction. Research
this issue, and find out how long animals keep 50% of the administered
antibiotics in their bodies.
Book
Review: "The Rise and Fall of Modern Medicine"
In this book review, Jeffrey Shallit discusses and contests Le Fann's
position in his book. There is an interesting question raised about
antibiotics--why did organisms start making them?
Purdue
Agriculture - Impact
This Purdue University website explains an alternative that researchers
have come up for a certain class of antibiotics that are currently in
widespread use with cattle and livestock across the United States.
p. 417
Question 29
Papain is an enzyme derived from tropical papaya fruit. It
acts as a catalyst to break down the peptide bonds in proteins. Research
to find how this enzyme is being marketed for consumer use, and comment
on the potential effectiveness of these uses.
The
Fruits of Genetic Modification
This website, of McGill University's Office for Chemistry and Society,
discusses the chemical papain, that has been synthesized from the papaya
fruit. It goes on to describe the genetic modifications that have been
made to papaya to allow it to resist the danger of certain viruses.
Papaya
- pawpaw
This website begins by describing the human history of papaya, and then
goes into an explanation regarding the chemistry of the papaya fruit.
Of course, it mentions papain, and its widespread use as a meat tenderizer.
Unit 3 Review
General Links
Energy
Technology and Fuel Economy
This government website addresses fuel economy, an area that can be
significantly improved upon, given that currently less than 15% of the
energy expended by a car is all that is used to make it move forward.
Thermographic
Surveys
This corporate website promotes a thermographic surveying technique
that allows for temperature detection without any contact.
Snell
Infrared
This corporate website promotes the company's infrared detection services.
They provide thermograms as a service for a variety of different purposes,
from detecting flaws in new computer chips, to identifying swollen muscles
in the body.
EPA's
Global Warming Site
This website of the United States Environmental Protection Agency provides
information about global warming, with sections on climate, emissions,
impacts, and actions.
Global
Warming: Early Warning Signs
This website contains information about changes that have been recorded
around the world, related to the phenomenon of global warming.
Fusion
Energy
This website briefly explains, in simple language with diagrams, nuclear
fusion and fission.
Introduction
to Fusion
Iter Canada is a non-profit organization that promotes nuclear energy
as an alternative source of power. In this site you will find a straightforward
argument in favour of fusion energy.
Explosives
This Encarta.msn.com article covers explosives, their characteristics,
their different types and their safety.
Explosives
Science
This article written by two Los Alamos researchers explains in great
detail how explosives work. The article includes several pictures and
diagrams, along with many references.
Homogeneous
Catalysis
This corporate website explains the process of homogeneous catalysis,
along with the company's techniques for using molecular mechanics and
quantum mechanics to determine the catalytic results that are being
sought after.
The
Growing Roles of Expansins
This article from the science journal, "The Proceedings of the
National Academy of Sciences," discusses plant molecules called
expansins, and their structure and function.
Plant
Growth Regulators
This website contains notes from a university lecture on the effects
of hormones on plant growth. It discusses the many classes of hormones
one by one, and addresses each one's likely function and effect on growth.
Ripening
Tomatoes with Ethylene
This article from the University of Florida discusses the use of ethylene,
a natural plant hormone, to ripen tomatoes and other fruits. It includes
information on initiating ripening, ideal conditions, and a few diagrams
that summarize the process in a commercial setting.
