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Oxygen
Part 1 of Paper
.... part in the carbon-nitrogen cycle,
one process responsible for stellar energy production. in excited
states is responsible for the bright red and yellow-green colours of the
aurora. The atmosphere of Mars contains about 0.15% oxygen. About two
thirds of the human body, and nine tenths of water, is oxygen. The gas is
.... Part 2 of Paper
....ts and animals and for
practically all combustion.
history of oxygen
Leonardo da Vinci suggested that air consists of at least two
different gases. Before then, air was felt to be an element in its own
right. He was also aware that one of these gases supported both flames and
life. Oxygen was prepared by several workers before 1772 but these workers
did not recognise it as an element. Joseph Priestley is generally credited
with its discovery (who made oxygen by heating lead or mercury .... |
| Number of words: 954 - Approximate pages: 4 |
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