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Per16_over - Preview of Period 16 Uses of Chemical Energy...

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Preview of Period 16: Uses of Chemical Energy 16.1 Sources of Pollution What human activities cause the most pollution? How is pollution detected? 16.2 Sources of Pollution What causes acid rain? What causes smog? What causes depletion of the ozone layer? 16.3 Global Warming What are greenhouse gases? How can greenhouse gases cause an increase in the average temperature of the Earth? 16-1
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Incomplete and Complete Combustion Complete Combustion produces 9 carbon dioxide (CO 2 ) and 9 water (H 2 O) Incomplete Combustion produces compounds that can react further with oxygen: 9 carbon 9 carbon monoxide (CO) and 9 hydrocarbons from burning fossil fuels. 16-3
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Dangers of Carbon Monoxide Carbon monoxide (CO) molecules in the blood take away oxygen from the hemoglobin molecules. This lowers the oxygen-carrying ability of the blood. High enough levels of carbon monoxide can result in oxygen starvation and death. CO can be produce by any source of incomplete combustion, such as gas or oil furnaces, kerosene space heaters, or fireplaces. CO from the exhaust of car motors running in an attached garage can seep into a home and be fatal. Never run an automobile in a closed garage! Symptoms of CO poisoning include flu-like symptoms of headaches, nausea, and fatigue. At higher concentrations: drowsiness, confusion, convulsions, unconsciousness, and even death. 16-4
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Acid Rain Burning high sulfur coal emits sulfur oxide gases (S0 2 and S0 3 ) into the atmosphere. These oxides of sulfur combine with water molecules to form sulfuric acid molecules. Oxides of nitrogen (NO, NO 2 , N0 3) emitted from gasoline and diesel engines combine with water to form nitric acid molecules When these molecules precipitate, the result is weakly acidic rain. Effects of sulfur and nitrous oxides: 1) In the atmosphere, these oxides are harmful to human health.
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