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Flammable Solids : Flammable solids are substances which are flammable or liable to spontaneous combustion or emit flammable gases on contact with water. Examples are: camphor, cinema films, hay and straw, phosphorus, triethyl aluminium, sodium sulphide, alkali metals, alkali amalgams, uncoated aluminium powder, etc.
Anthropological Evidence Modern humans arose at a time when the Earth was going through a very cold and icy period called the Ice Age, which began about 75,000 years ago and
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Sterilizing water by boiling The presence of tiny living plants and animals makes water inappropriate for drinking. Such forms of life can only be seen by a microscope. We can
A simple equal-arm lever Make a wooden base 15 cm square and 2 cm thick. In the centre of the base fasten one more block of wood 4 cm square and 3 cm thick. Fasten to two sides
Explain the Olfactory receptors In the section on taste receptors earlier, we learnt that there is a regional distribution of taste buds for primary taste sensations like sweet
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What is the important role of Vitamin K Vitamin K , as you may already know, is a fat-soluble vitamin that plays an important role in blood clotting. It was first observe
define what is lithosphere
Explain concept of Salting out Salting out: Proteins in aqueous medium can be precipitated by qdding, trichloroacetic acid (TCA) or perchloric acid (PCA). Salts of hea
How to make a devil diver (Cartesian diver) Find a tall glass jar with a quite wide mouth. Wrap a few turns of copper wire about the thin part of the rubber bulb from a medicin
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