Option 1 b.1
Download as PPTX, PDF0 likes3,617 views
The document discusses the composition and properties of Earth's atmosphere and the gas oxygen. It provides details on the composition of air, describing that nitrogen and oxygen are the most abundant gases, making up 78% and 21% respectively. The document then focuses on oxygen, noting that it is the most reactive gas in air and supports combustion, forming oxides when reacting with most elements. Methods for producing oxygen through the decomposition of hydrogen peroxide or the liquefaction and fractional distillation of air are also summarized.
1 of 10
Downloaded 57 times
More Related Content
What's hot (20)
Ad
Viewers also liked (20)
Ad
Similar to Option 1 b.1 (20)
More from Martin Brown (20)
Recently uploaded (20)
Option 1 b.1
- 1. Option 1B 1
- 2. The Atmosphere The atmosphere is a layer of gases that extends about 100km above the surface of the earth. 2
- 3. The Earth’s Atmosphere From Space Component Nitrogen, N2 Oxygen, O2 Argon, Ar 0.9% Water, H2O Carbon dioxide, CO2 Percent composition 78% 21% 0 – 4% (variable) 0.034% (variable) Copyright © 2007 Pearson Benjamin Cummings. All rights reserved.
- 4. Air Air is a mixture of gases. Composition of dry unpolluted air 4
- 5. 1B.1 Oxygen Oxygen is the most reactive gas in the air. It was discovered by Joseph Priestly in 1778. It supports combustion. It reacts with most elements to form oxides. It is a diatomic gaseous element and non-polar molecule. 5
- 6. Laboratory preparation of O2 H2O2 ------ H2O + ½ O2 6
- 7. Manufacture of oxygen Liquefaction & Fractional Distillation of air 7
- 8. Manufacture of oxygen - liquefaction & fractional distillation of air Air Filter removes dust CO2 removed by NaOH H2O removed by silica in drying tower N2, O2 and noble gases are compressed and cooled Gases expand Liquid air Fractionating column Oxygen Argon Nitrogen
- 9. Uses of oxygen Oxygen is used to help in breathing e.g. premature babies, on aeroplanes, patients recovering from heart attacks or with lung ailments. 9
- 10. Uses of oxygen Oxygen is with ethyne form oxyacetylene torches used for cutting and welding metals. Oxygen is also used in steel making. 10