Hi everyone I currently have a 78 in Chemistry and my final grade rests on 3 more assignments so I can really use an A! Can anyone please help
Which source is responsible for the greatest amount of NOx emissions in the U.S.?
lightning
biomass burning
fossil fuel combustion
microbial activity in the soil
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Which of the following is NOT considered an air pollutant?
water vapor
ozone
nitric oxide
sulfur dioxide
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What type of very reactive chemical species participates in the formation of photochemical smog?
free radicals
strong acids
weakly bonded materials such as those that contain hydrogen bonds
substances that contain coordinate covalent bonds
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Which of the following dissolved substances would you not expect to be in "pure" water?
CN-
Fe 2+
O2
dust particles
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What percentage of the human body is water?
10 percent
40-50 percent
70 percent
98 percent
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Which ions are associated with hard water?
Na+ and NH4+
Mg2+ and Ca2+
K+ and Cl-
Pb2+ and Zn2+
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Which of the following is a property of water that makes it unique from nearly all other chemicals on earth?
compared to molecules that are similar to its size, water is the only compound that is a liquid at room temperature
the boiling point of water is hundreds of degrees higher than other molecules that are similar to its size
water is the only compound that exists naturally in all three physical states of matter (solid, liquid, gas) under normal conditions on earth.
all of these are unique properties of water
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A fertilizer is labeled 6-10-12. The "12" represents the percentage of
nitrogen
potassium
phosphorus
oxygen
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The most widely used herbicide is
primicarb
carboryl
2,4-dichlorophenoxyacetic acid
dioxin
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Ammonium nitrate, NH4NO3, is a straight nitrogen chemical fertilizer. What problems does it pose?
it is too expensive
it is not a commonly produced industrial chemical
It is too easily leeched from soil because it is very soluble, posing a pollution concern
It is too stable, and plants cannot pick it up from the soil
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