2/8 A/B DayLEQ: What are the risks and benefits ofusing 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 achemical?5. Copy and complete: The concentration of achemical [increases/decreases] at the top of the foodchain.
Let’s Practice: Fill in the blank! Beginning in the 1950’s, scientists started spraying large DOSES _________ of DDT into the environment. DDT is a chemical with a very high POTENCY 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 CONCENTRATION 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. OrganismsEXPOSURE 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 SUSCEPTIBILITY ______________ to the chemical, not all of the eagles died.
EOG QUESTIONWhich factor best explains why some peoplewill develop cancer and others will not afterbeing exposed to the same high levels of aharmful chemical? a) concentration of the chemical b) potency of the chemical c) individual susceptibility to the chemical d) 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
Chemicals Used Benefits RisksSanitationPreservativesMedicineAgriculture
Chemicals Used Benefits RisksSanitation UNSCRAMBLE THEPreservatives FOLLOWING HERE BYMedicine PUTTING THE INFORMATION NEXT TO THE APPROPRIATEAgriculture TERM!
SANITATION: Check your work!-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 turnbrownMEDICINE- the use of chemicals to treat sickness and pain-chemicals are used to create antibiotics, which kill disease-causingbacteriaAGRICULTURE-the use of fertilizers, which give plants nutrients to help them grow-the use of chemicals such as pesticides, which kill organisms (likeinsects) that eat crops
Chemicals Used Benefits RisksSanitation UNSCRAMBLE THEPreservatives FOLLOWING HERE BY PUTTING THE INFORMATION NEXTMedicine TO THE APPROPRIATE TERM!Agriculture
Risk-Benefit Analysis: Sanitation-chlorine can cause water to tasteand smell bad-Treating drinking water removesharmful bacteria
Risk-Benefit Analysis: Preservatives-keeps food safe to eat for a longtime-some people are allergic orintolerant to preservatives, whichcan make them sick
Risk-Benefit Analysis: Medicine-bacteria can adapt to themedicine and come back strongerthan before-cures illness and stops spread ofdisease
Risk-Benefit Analysis: Agriculture-helps us increase the amount ofcrops we can produce-can act as carcinogens (cause cancer)-can destroy ecosystems by causingover-growth or killing animals in thefood chain
EOG QUESTIONWhat makes fertilizers a benefit to the farmingindustry? a) they increase nutrients in the soil b) they increase the growth of helpful bacteria c) they decrease the chance of bacteria growing in the soil d) they decrease the chance of plants being eaten by insects
EOG QUESTIONWhat is the best way to reduce a person’sexposure to pesticides?? a) put leftovers in the refrigerator b) do not eat bread with mold on it c) make sure meat is cooked all the way before eating it d) wash fruits and vegetables before eating them
EOG QUESTIONWhy were some pesticides, such as DDT,removed from public use? a) they can cause heart disease b) they can cause diabetes c) they can cause meningitis d) they can cause cancer
Make an advertisement!On your paper, make an advertisement for a type ofmedicine, pesticide, fertilizer, food preservative, or anew sanitation chemical.Your advertisement MUST INCLUDE: -the name of your product -a description of what it does BE CREATIVE! Think -the benefits of using it about what a real -the risks of using it advertisement looks like and what it -illustrations 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)