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Chapter 20: Air and Oxygen (14 videos)  (Practice Test)
20.1: The Composition of Air  (Practice Test)
  1. Composition of Atmosphere
  2. Investigating the Composition of Air
20.2: Separating the Components of Air
  1. Fractional Distillation of Liquid Air
20.3: The Importance of Oxygen  (Practice Test)
  1. Respiration
  2. Combustion
20.4: Oxides: Oxygen Combined with Elements  (Practice Test)
  1. Basic Oxides
  2. Acidic Oxides
  3. Amphoteric Oxides
20.5: Air Pollution: Harmful Substances in the Air  (Practice Test)
  1. Pollutants
  2. Types of Pollutants,Oxides
  3. Pollutants of Sulphur Compound
  4. Pollutants of Nitro Compound
  5. More on Pollutants
20.6: Natural Compounds of Carbon  (Practice Test)
  1. The Carbon Cycle

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