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principle of EDTA..
Give the common name of the historic mineral that was the original source of radium and the first substance in which helium was discovered on earth: Pitchblende
Softening hard water by boiling Temporary hardness can be removed from water by boiling. Shake a little temporary hard water with a few drops of soap solution and see if you c
Explain the Conditions for Ventricular Fibrillation Ventricular fibrillation may be seen in the following two conditions: 1) When a person is electrocuted, and 2) As a c
Rejection of Heliocentrism: This happened in the year 1918 when the astronomer Harlow Shapley (1885-1972) first surveyed the size and shape of the Milky Way Galaxy. He sh
The Expanding Universe: Hubble's observations had proved the existence of galaxies. After mapping as many galaxies as could be seen by the telescopes then'available, he tu
Observe the surface of the moon :- Use the small telescope or a pair of field glasses. Examine the surface of the moon and see if you can see any of its craters and mountains.
Mechanics: Another hnch of science which is, perhaps, the greatest contribution of Greek civilisation is mechanics. Mechanics developed out of the necessities of imgation,
Beyond the milky Way Galaxy: Let us now move away from the Earth and venture into the space beyond. If we were at a point far out in space we would see scattered in space, a
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