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Corrosive Substances : These substances cause severe damage by chemical action when in contact with living tissue or in case of leakage, destroy /damage other materials. Mineral a
Depletion of Ozone Layer: Since the last decade or so, there is concern about the possible reduction in the ozone layer surrounding the earth. Now the question arises, what h
CHEMICAL EFFECTS OF AIR Wash a small wad of steel wool in gasoline, benzene or carbon tetrachloride (car- bona) to delete any grease. Squeeze it out and then fluff it. As soon
Atomic theory in antiquity: The oldest of Indian philosophical systems was Samkhya. The system envisaged that everything except consciousness evolved out of primaeval matter.
To show how water rises in different types of soil Place about 15 cm of dissimilar types of soil in a series of lamp chimneys after tying a piece of cloth over the end of every
Why does marble rarely contain fossils? This is due to of the way that it is formed. When you have a rock that is formed bymetamorphosis then it has been created by heat and pres
Personal Protective Devices : We shall now discuss the details of protective devices required for safety in a laboratory. The aim of protective devices is to minimise the risk of
What simple machine could you use to lift a heavy rock out of the ground? How would use the machine
For highly volatile liquid wastes Highly volatile liquid waste could be disposed of by effective ventilation until the liquid completely evaporates. Example: Diethyl ether.
1. Define the cell theory. 2. Contrast the light microscope with the transmission electron microscope. 3. Describe the structure and function of the plasma membrane, chro
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