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Ch. 10 Representative Gases

Ch. 10 Representative Gases. Oxygen  0 2 2 molecules of oxygen What you breathe Ozone is a gas as O 3 3 molecules of oxygen Ozone filters out U.V. light O 2 & O 3 are allotropes They have 2 or more different molecular forms of the element oxygen.

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Ch. 10 Representative Gases

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  1. Ch. 10 Representative Gases • Oxygen  02 • 2 molecules of oxygen • What you breathe • Ozone is a gas as O3 • 3 molecules of oxygen • Ozone filters out U.V. light • O2 & O3 are allotropes • They have 2 or more different molecular forms of the element oxygen.

  2. Oxygen is needed for life, combustion of fuels, and energy. • The ozone is destroyed by CFC’s, CO2, and other pollutants • O3 O2 + O • Pollutants break down the ozone • This may cause global warming • Oxygen is the most abundant element per mass on Earth.

  3. An oxide is a compound that contains O, which has a –2 charge. • O2 is a peroxide • A peroxide is a compound containing O2, which has a –1 charge. • Which group is oxygen most likely to form with ? • Group 2 (+2 charge)

  4. Hydrogen • Hydrogen is the most abundant element in the universe. • Hydrogen is a highly efficient fuel in the form of a gas. • Hydrogen may one day replace natural gas if scientist figure a way to use hydrogen, so it is not as explosive. • Hydrogen is the least dense element. • Hydrogen is found in more compounds than any other element.

  5. Nitrogen • Nitrogen as a gas is N2. It is the most abundant gas in the Earth’s atmosphere. • Approximately 80 % atmosphere is nitrogen. • Ammonia, which is made up of nitrogen and hydrogen is an important fertilizer. • Nitrogen and Hydrogen are both odorless, colorless, and tasteless gases. • Liquid nitrogen is formed at temperatures less than –195 degrees C.

  6. Ammonia is a colorless gas with a strong odor and is harmful in high concentrations. • Ex. Household ammonia • Production of ammonia • Haber process • N2 + 3H2 2NH3

  7. Carbon Dioxide • Plays a major role in supporting plant life and our life. Without plants we wouldn’t survive. • We breathe out carbon dioxide as a waste product, which plants use for photosynthesis. • 6CO2 + 6H2O  C6H12O6 + O2 • Do you go a day without using plants?

  8. What produces more CO2? What reduces CO2? • CO2 breaks down the ozone layer. • Carbon dioxide acts as an insulator in the Earth’s atmosphere. The U.V. light that gets into the Earth’s atmosphere has a hard time getting back out of the atmosphere.

  9. Carbon dioxide is a colorless gas with a bit of a sour taste. • Carbon dioxide does not combust or burn. • Carbon dioxide as a solid is dry ice • -78.5 degrees C • Carbon dioxide as a liquid is in fire extinguishers • Helps to reduce combustion • Carbon dioxide as a gas is in pop.

  10. Carbon monoxide (CO) is a highly toxic compound produced as a by-product of many human activities and machines. • CO is a poisonous gas. • CO is a colorless, tasteless, and odorless gas • Hard to detect • Causes nausea and head-aches

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