Dear students this is the new chemistry chapter (page no 55).
Read the chapter, note and underline important points. If you have any problem
call me or send email. Here are some more important facts about water.
WATER
Water, common name applied to the liquid
state of the hydrogen-oxygen compound H2O. The ancient philosophers
regarded water as a basic element typifying all liquid substances. Scientists
did not discard that view until the latter half of the 18th century. In 1781
the British chemist Henry Cavendish synthesized water by detonating a mixture
of hydrogen and air. However, the results of his experiments were not clearly
interpreted until two years later, when the French chemist Antoine Laurent
Lavoisier proved that water was not an element but a compound of oxygen and
hydrogen. In a scientific paper presented in 1804, the French chemist Joseph
Louis Gay-Lussac and the German naturalist Alexander von Humboldt demonstrated
jointly that water consisted of two volumes of hydrogen to one of oxygen, as
expressed by the present-day formula H2O.
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