Sci 9 - 3.3 Student Notes-filled...
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Sci 9 3.3 Student Notesfilled in.notebook 1 3.3 Hazardous Chemicals Affect Living Things pg. 248252 Chemicals can become ______________ in soil, river or lake bottoms, and in plants. Result: they _________ in the environment for long periods of time they ___________ in concentration as they move ____ the food chain. This is called ____________________. Ex. mercury Sources of Mercury Emissions or waste fluids from waste incinerators, coal fired plants, commercial boilers & furnaces. Mercury falls into the water Bacteria ______ mercury to a molecule that algae can absorb _______ are eaten by invertebrates (insects) _____ eat many insects and the mercury is stored in their ______ ________ eat fish. Chemical Effects Short term ex. a herbicide kills weeds. Long term biomagnification of mercury or PCBs. Exxon Valdez Oil Spill (1989) Crude Oil contains many chemicals and must be refined through __________ and _____________ the compounds as it cools. A spill of approximately _________ barrels of crude oil occurred on the southern coast of _________.
Transcript of Sci 9 - 3.3 Student Notes-filled...
Sci 9 3.3 Student Notesfilled in.notebook
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3.3 Hazardous Chemicals Affect Living Things pg. 248252
Chemicals can become ______________ in soil, river or lake bottoms, and in plants.
Result: they _________ in the environment for long periods of time they ___________ in concentration as they move ____ the food chain. This is called ____________________. Ex. mercury
Sources of MercuryEmissions or waste fluids from waste incinerators, coal fired plants, commercial boilers & furnaces.
Mercury falls into the water Bacteria ______ mercury to a molecule that algae can absorb _______ are eaten by invertebrates (insects)
_____ eat many insects and the mercury is stored in their ______________ eat fish.
Chemical EffectsShort term ex. a herbicide kills weeds.Long term biomagnification of mercury or PCBs.
Exxon Valdez Oil Spill (1989)Crude Oil contains many chemicals and must be refined through __________ and _____________ the compounds as it cools.
A spill of approximately _________ barrels of crude oil occurred on the southern coast of _________.
Sci 9 3.3 Student Notesfilled in.notebook
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When spilled, the lighter molecules in crude oil ___________ in the air or water.Heavy hydrocarbons create "tar balls" that are _________________ or ______ into the sediment.Bacteria may also degrade oil for _______.
Some hydrocarbons are ________ at 1 ppb and can persist in the environment for more than ____ years.
Result:It polluted thousands of km2 of _______ and hundreds of km of __________. Only about 2% made it to shore. Mostly it ____________ or dispersed in the water. Bacteria and light _______________ most of the oil 10 years later.
Impact: many organisms ______. Ex. floating algae and invertebrates near the shore. fish eggs or young fish died or were ____________. Adult fish lost their __________ and ______. Mammals & seabirds were _________ in oil and many died. Fisherman no longer had a source of _________. Tourism and recreation ____________.
Only 14% of the oil was recovered by ________ and containment booms.
Removing sediment helped clean the beaches.
Birds and mammals were _________.
Other sources of spills: Pipelines and storage tanks spill or leak, tanker trucks spill, oils well blow out.
Sci 9 3.3 Student Notesfilled in.notebook
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Procedures for Cleanup Spills over 2m3 must be reported. There is training and emergency procedures in place for oil companies.
QUESTIONS1. Use an example to explain the term "biomagnification".
2. List 5 ways that the Exxon Valdez spill affected Prince William Sound.
3. a) Look at figure 3.15 on page 251. What percent of the oil was degraded by light after evaporating into the air?
b) What percent of the oil reached the shores in Prince William Sound?
4. Describe two ways that chemicals can become concentrated or build up in the environment.
5. Suggest two reasons why seem chemicals remain unchanged in the environment for a long time.
