Option 1 b.1

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Information about Option 1 b.1

Published on March 9, 2014

Author: brownm7

Source: slideshare.net

Option 1B 1

The Atmosphere The atmosphere is a layer of gases that extends about 100km above the surface of the earth. 2

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.

Air Air is a mixture of gases. Composition of dry unpolluted air 4

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

Laboratory preparation of O2 H2O2 ------ H2O + ½ O2 6

Manufacture of oxygen  Liquefaction & Fractional Distillation of air 7

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

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

Uses of oxygen   Oxygen is with ethyne form oxyacetylene torches used for cutting and welding metals. Oxygen is also used in steel making. 10

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