1) The chemical reactions that take place during respiration and burning fossil fuels produce a) Carbon Dioxide b) Carbon Sulfide c) Methane d) Water vapor e) Nitrogen f) Oxygen 2) How much of the atmosphere is Nitrogen? a) 21% b) less than 1% c) 78% d) 1% e) 60% f) 54% 3) Complete combustion produces a) carbon monoxide and water b) water only c) carbon monoxide only d) carbon dioxide and water e) carbon dioxide only f) sulfur only 4) The greenhouse effect a) makes the earth cold b) makes the earth warm c) is produced by carbon particulates d) means the earth will look green 5) Sulfur Dioxide a) is a greenhouse gas b) is made up of one sulfur and one oxygen c) can lead to acid rain d) is produced when burning fossil fuels 6) What does the grill do in the water purification process? a) is a coagulant b) removes small trash c) removes big trash d) prevents animals from entering the system e) is the first step in the cleaning process f) kills bacteria 7) Alum's purpose is to a) act as the glue to get small particles together b) kill bacteria c) remove big trash d) prevent animals from entering the system e) make floc 8) the filter... a) is always made up of carbon b) removes small particles c) is usually made up of sand d) kills bacteria e) is the first step in the water purification process 9) Chlorine a) kills bacteria b) is the last step in the water purification process c) is the first step in the water purification process d) kills human e) catches big trash f) kills animals 10) Carbon monoxide a) is produced in incomplete combustion b) is toxic c) is a greenhouse gas d) traps heat e) is nontoxic f) has a strong smell

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