2) Our atmisphere can be characterized both as a thin veil that supports life and as a few vertical miles of chemicals. Explain what makes each description accurate. Also state which features of our atmosphere each description emphazised and which ones it omits ?
6) a)The concentration of argon in air is appoximately 0.9%. Express this value in ppm.
b) The air exhaled from the lungs of a smoker has a concentration of 20-50ppm CO. In contrast, air exhaled by nonsmokers is 0-2 ppm CO. Express each concentration as a percent.
c) In a tropical rain forest, the water vapor concentration may reach 50,000ppm. Express this as a percent.
d) In the dry polar regions, water vapor may be a mere 10ppm. Express this a percent.
8) Consider this representation of the reaction between nitrogen and hydrogen to form ammonia (NH3) [3a image as attached]
a) Are the masses of reactants and products the same? Explain.
b) Are the nmbers of molecules of reactants and of products the same? Explain.
c) Are the total number of atoms in the reactants and the total number of atoms in the products the same? explain.
12b) This fire is emitting at least three pollutants. Which are visible and which are not?
23a ) Count the atoms on both sides of the arrow to demonstrate that these equations are balanced.
2 C3H8 (g) + 7 02(g) === 6 CO (g) + 8 H20 (l)
29) The percentage of carbon dioxide in inhaled air is lower than it is in exhaled air, but the percentage of oxygen in inhaled air is higher than in exhaled air. How an you account for these relationships?
30 Cars don't in hale and exhale like humans do Nonetheless, the air that goes into a car is different from what comes out. In Your Turn 1.19 you listed what comes out a tailpipe. Now comment on the differences between the air that goes into the car engine and what comes out the tailpipe. For which chemicals have the concentrations noticeable increased or decreased ?
32) A headline from the Pioneer Press in St. Paul Minnesota (January 8, 2008) : " Man dies after exposure to gas; carbon monoxide sickens five others"
a) name two possible sources of CO inside a home.
b) The level measured was 4700 ppm. Express this value as a percent.
c) How does this level compare with the US ambient air quality standards set by the EPA?
d) Name three symptoms that the survivors most likely experienced.
e) Where in a home should you install CO detectors? Note : adjacent to a furnace is not usually recommended.
44) At certain times of the year, inhabitants of the beautiful city of Santiago, Chile, breathe some of the worst air on the planet ?
45) Explain why jogging outdoors ( as opposed to sitting outdoors) increases your exposure to pollutants.
b ) Jogging indoors at home can decrease your exposure to some pollutants, but may increase your exposure to others. Explain.