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Notes   i. oxygen and ozone - 2010
 

Notes i. oxygen and ozone - 2010

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    Notes   i. oxygen and ozone - 2010 Notes i. oxygen and ozone - 2010 Presentation Transcript

    • I. Oxygen and Ozone
    • Objectives:
      know the names and formulas of oxygen and ozone.
      define allotrope.
      know the structure, properties, and occurrence of oxygen and ozone.
    • I. Oxygen and Ozone
      There are two types of oxygen molecules that exist in the earth’s atmosphere:
      1. molecules of 2 oxygen atoms – O2 called oxygen
      2. molecules of 3 oxygen atoms – O3 called ozone
    • I. Oxygen and Ozone
      O2 and O3 are allotropes of the element oxygen.
      allotrope – one of two ore more forms of an element that have
      the same physical state
    • I. Oxygen and Ozone
      Structure of oxygen – O2:
      Most oxygen exists in the form of diatomic molecules (two oxygen atoms double covalently bonded together).
      Diatomic oxygen molecules have a linear shape.
    • I. Oxygen and Ozone
      2. Properties of oxygen – O2:
      Colorless, odorless, and tasteless gas.
      Oxygen reacts with many metals to form oxides.
      oxide - ionic compound containing the O-2 ion
    • I. Oxygen and Ozone
      Occurrence of oxygen – O2:
      Oxygen makes up approximately 21 % by volume of the air we breathe.
      Oxygen is the most abundant element by mass in the earth’s crust, waters, and atmosphere. (*Hydrogen is the most abundant element by number of atoms.)
    • I. Oxygen and Ozone
      Structure of ozone – O3:
      Ozone molecules consist of 3 oxygen atoms covalently bonded together.
      Ozone molecules have a bent shape.
    • I. Oxygen and Ozone
      Properties of ozone – O3:
      O3 at ground level (bad) - poisonous blue gas with a pungent odor; constituent of smog; harmful to plant tissue and lungs
    • I. Oxygen and Ozone
      Occurrence of ozone – O3:
      O3 in the upper atmosphere (good) – ozone molecules absorb harmful uv radiation from the sun; ozone acts as the Earth’s natural sunscreen
      Over 90% of ozone naturally occurs in the upper atmosphere.
      The ozone in the upper atmosphere is referred to as the ozone layer.