- Environmental Chemistry Worksheet 1 Bisphenol A Bpa Has Been In The News In Recent Months It Is Used In The Manufact 1 (53.42 KiB) Viewed 145 times
- Environmental Chemistry Worksheet 1 Bisphenol A Bpa Has Been In The News In Recent Months It Is Used In The Manufact 2 (53.42 KiB) Viewed 145 times
- Environmental Chemistry Worksheet 1 Bisphenol A Bpa Has Been In The News In Recent Months It Is Used In The Manufact 3 (52.66 KiB) Viewed 145 times
- Environmental Chemistry Worksheet 1 Bisphenol A Bpa Has Been In The News In Recent Months It Is Used In The Manufact 4 (62.26 KiB) Viewed 145 times
4. The effect on indoor air quality of off-gassing from new synthetic building materials is a concem because of the release of A volatile organic compounds B. carbon dioxide C. water vapour D. NO gases Use the following information to answer the next two questions. The graph below which shows pollution from nitrogen-containing compounds (nitrates) in a brook flowing through a deforested and a forested area between 1965 and 1968. Hubbard Brook Nitrate Pollution Study Deforested 80 60 40 20 3.89& Nitrate Concentration in the Brook (mg/L) Completion of tree cutting Forested 3 2 الم 1 0 JJASOND JEMAMJJASOND JEMAMJJASOND JFMAM 1965 1966 1967 1968 Month/Year 5. State how nitrate pollution in the brook changed after the brook flowed through the deforested area. 6. Explain how deforestation contributed to this change.
Use the following information to answer the next two questions. In 1989, the oil tanker Exxon Valdez hit ground and a hole was ripped in its hull. Millions of gallons of crude oil spread along the coast of Alaska. In some places, the oil soaked 2 feet deep into the beaches. There seemed to be no way to clean up the spill. Then scientists decided to enlist the help of bacteria that are found naturally on Alaskan beaches. Some of these bacteria break down hydrocarbons into simpler, less harmful substances such as carbon dioxide and water. The problem was that there were not enough of these bacteria to handle the huge amount of oil. To make the bacteria multiply faster, the scientists sprayed a chemical that acted as a fertilizer along 70 miles of coastline. Within 15 days, the number of bacteria had tripled. The beaches that had been treated with the chemical were much cleaner than those that had not. Without this bacterial activity, Alaska's beaches might still be covered with oil. This process of using organisms to eliminate toxic materials is called bioremediation Bioremediation is being used to clean up gasoline that leaks into the soil under gas stations. At factories that process wood pulp, scientists are using microorganisms to break down phenols (a poisonous by-product of the process) into harmless salts. Bacteria also can break down acid drainage that seeps out of abandoned coal mines, and explosives, such as TNT. Bacteria are used in sewage treatment plants to clean water. Bacteria also reduce acid rain by removing sulphur from coal before it is burned. Because North America produces more than 600 million tons of toxic waste a year, bioremediation may soon become a big business. If scientists can identify microorganisms that attack all the kinds of waste we produce, expensive treatment plants and dangerous toxic dumps might be put out of business. 7. Describe one economic advantage of bioremediation. 8. Describe one environmental problem that may possibly result from using microorganisms to fight pollution.