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Chemistry Around Us

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Submitted By andrew99
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1. .5 L/1 b x 15 b/1min. x 60 min /1 hr. x 8hr = 3600 L. Five things one can do to improve the quality of the air that you and others breathe are burn less wood, cooking fuels, and gasoline and using things such as hand-operated lawnmower and eggbeater.
2. It supports life because it holds the oxygen that we need to survive, it filters out harmful UV rays from the sun, it holds heat and creates weather, and keeps stuff from entering from the atmosphere. That all happens in the stratosphere. It can be considered a few vertical miles of chemicals because each level has its own chemicals in it. For example the stratosphere contains a lot of O3.
4. PM10 includes particles with an average diameter of 10 mm or less, .0004 inches. PM2.5 is a subset of PM10 and includes particles with an average diameter of less than 2.5 mm. PM, when inhaled, goes into the lungs and causes irritation. The smallest particles go into the bloodstream and can cause heart disease or aggravate existing condition. Some examples of pm are the product of truck and car engines, coal-burning power plants, fires, and blowing dust. PM can sometimes be seen as soot or smog.
6. Argon is 9,000 parts per million. The concentration of exhaled air of a smoker is .0020-.0050% CO and the exhaled air of a non-smoker is 0-.0002 % CO. The water vapor concentration may reach 5 % in a tropical rain forest. In a dry polar region the water vapor may be .001 percent.
7. Box A is a compound because there are 2 molecules of one compound made up of two different elements. Box B is a mixture because there are 2 atoms of one element plus 2 atoms of another element. Box C is a mixture because there are three different substances, two elements, and a compound. Part D is an element because there are 4 of the same elements.
8. The masses of the reactants and the products are the same. They are...

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