2/8 A/B Day LEQ: What are the risks and benefits of using chemicals? 1. What is a dose? 2. What is exposure? 3. What is potency? 4. Why will some people get sick and others will not—even when they are exposed to the same amount of a chemical? 5. Copy and complete: The concentration of a chemical [increases/decreases] at the top of the food chain.
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2/8 A/B DayLEQ: What are the risks and benefits of using chemicals?
1. What is a dose?2. What is exposure?3. What is potency?4. Why will some people get sick and others will not—even when they are exposed to the same amount of a chemical? 5. Copy and complete: The concentration of a chemical [increases/decreases] at the top of the food chain.
Let’s Practice: Fill in the blank!Beginning in the 1950’s, scientists started spraying large _________ of DDT into the environment. DDT is a chemical with a very high ________, meaning it is extremely powerful, even in small amounts. As humans continued to spray DDT into the environment, we quickly learned that the _______________ of the chemical increased as it traveled higher up the food chain. Small organisms, like insects, would only have a small percentage of DDT in their bodies, but the organisms at the top of the food chain would eat millions of smaller animals, which would greatly increase the amount of the chemicals in their bodies. Organisms ________ to the chemical continued to increase because the chemical did not disappear once it was sprayed into the environment. Because different organisms have a different ______________ to the chemical, not all of the eagles died.
DOSESPOTENCY
CONCENTRATION
SUSCEPTIBILITY
EXPOSURE
EOG QUESTION
Which factor best explains why some people will develop cancer and others will not after being exposed to the same high levels of a harmful chemical?
a) concentration of the chemicalb) potency of the chemicalc) individual susceptibility to the chemicald) individual exposure to the chemical
Today’s LEQ: What are the risks and benefits of using chemicals?
By the end of today, you should be able to…
1. Make a risk-benefit analysis for using chemicals for medicine, sanitation, food preservatives, and agriculture
Focus Vocabulary
102. Sanitation103. Preservatives104. Oxidation105. Fertilizer106. Pesticide
Activating Strategy:
http://www.youtube.com/watch?v=R7gtBXMyMI0&feature=related
Think-Pair-Share: For $50,000, would you…
Eat a live scorpion?
Jump off a skyscraper?
Be covered in live snakes?
Risk-Benefit AnalysisYou just did a ….
What are the risks?What are the benefits?
Is it WORTH IT?!
Using Chemicals: RISKS AND BENEFITS
Chemicals Used RisksBenefits
Sanitation
Preservatives
Medicine
Agriculture
Chemicals Used RisksBenefits
Sanitation
Preservatives
Medicine
Agriculture
UNSCRAMBLE THE
FOLLOWING
HERE BY PUTTING THE
INFORMATION NEXT TO THE APPROPRIATE
TERM!
SANITATION:-the use of chemicals to remove or treat waste-the use of chlorine to filter dangerous material from drinking waterPreservatives:-the use chemicals to preserve food and keep it safe to eat-chemicals slow oxidation, which causes foods (such as apples) to turn brown
MEDICINE- the use of chemicals to treat sickness and pain-chemicals are used to create antibiotics, which kill disease-causing bacteria
AGRICULTURE-the use of fertilizers, which give plants nutrients to help them grow-the use of chemicals such as pesticides, which kill organisms (like insects) that eat crops
Check your work!
Chemicals Used RisksBenefits
Sanitation
Preservatives
Medicine
Agriculture
UNSCRAMBLE THE
FOLLOWING HERE BY PUTTING THE
INFORMATION NEXT TO THE APPROPRIATE
TERM!
Risk-Benefit Analysis: Sanitation
-chlorine can cause water to taste and smell bad
-Treating drinking water removes harmful bacteria
Risk-Benefit Analysis: Preservatives
-keeps food safe to eat for a long time
-some people are allergic or intolerant to preservatives, which can make them sick
Risk-Benefit Analysis: Medicine
-bacteria can adapt to the medicine and come back stronger than before
-cures illness and stops spread of disease
Risk-Benefit Analysis: Agriculture
-helps us increase the amount of crops we can produce
-can act as carcinogens (cause cancer)-can destroy ecosystems by causing over-growth or killing animals in the food chain
EOG QUESTIONWhat makes fertilizers a benefit to the farming industry?
a) they increase nutrients in the soilb) they increase the growth of helpful
bacteriac) they decrease the chance of bacteria
growing in the soild) they decrease the chance of plants
being eaten by insects
EOG QUESTIONWhat is the best way to reduce a person’s exposure to pesticides??
a) put leftovers in the refrigeratorb) do not eat bread with mold on itc) make sure meat is cooked all the way
before eating itd) wash fruits and vegetables before eating
them
EOG QUESTIONWhy were some pesticides, such as DDT, removed from public use?
a) they can cause heart diseaseb) they can cause diabetesc) they can cause meningitisd) they can cause cancer
Make an advertisement!On your paper, make an advertisement for a type of medicine, pesticide, fertilizer, food preservative, or a new sanitation chemical.
Your advertisement MUST INCLUDE:-the name of your product-a description of what it does-the benefits of using it-the risks of using it -illustrations
BE CREATIVE! Think about what a real
advertisement looks like and what it
includes!
Summarizer:
1. What is one risk of using preservatives in food?
2. What are the benefits of using chemicals for sanitation?
3. Do you think that using pesticides to grow crops is worth the risk of damaging our environment?
4. Why or why not (for # 3)
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