51. These propellants usually found in aerosol cans are thought to be harmful to
ID: 290910 • Letter: 5
Question
51. These propellants usually found in aerosol cans are thought to be harmful to the ozone layer. a. Chlorofluorocarbons b. carbonate c. chlorine d. carbonate 52.The form of air pollution that is the gray haze seen in cities is called: 53. What is the result when industrial chemicals combine with condensing water vapor? a. Acid rain b. base rairn c. greenhouse effect d. global warming 54.Which California City is generally considered to have America's worst air pollution problem? a. Burbank b. San Francisco c. Los Angeles d. Sacramento 55.Which Mexican City is considered to be the world's worst for air pollution? (Two words) 56.What is visible air pollution called? a. Smoglight b. Chemvis Pollution c. Photochemical Smog d. Rainbow Pollution 57.What is the main source of water pollution in unindustrialized nations? a. Carbon dioxide b. Pesticides c. industrial chemicals d. untreated sewage e.Explanation / Answer
51. a Chlorofluorocarbons- UV rays when they come in contact with CFCs, the chlorine atoms are liberated, which wander in the atmosphere till they meet the Ozone molecules. Chlorine and one of the oxygen atom from Ozone combine leaving behind a diatomic (O2). When a free oxygen atom contacts Chlorine-oxygen compound, the two oxygen atoms combine to form molecular oxygen again and thus this Chlorine can destroy the Ozone molecular structure and change it to O2.
52. Smog
53. Acid Rain: When atmoshperic pollution causes the precipitating rain to be acidic. Burning of fossil fuels, emit a lot of sulphue and nitrogen oxides which combine with atmospheric water.
54. Los Angeles - Emissions from cargo handling equipments and hotelling emissions from ocean-going vessls near the ports contribute a lot to this.
55. Mexico City
56. PhotoChemical Smog
57. Untreated sewage, destroys aquatic ecosystmes, threatening human livelihoods.
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