Ch' 10 Representative Gases

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 CFCs, 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 Earths 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 wouldnt 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
  Earths atmosphere. The U.V. light that gets
  into the Earths 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