JEE Chemistry Weightage Analysis and Preparation Guidelines

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Phosphorous : The bringer of Light

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Man invented fire ages ago and till date, fire is an indispensable aspect of our everyday life. Right from cooking to light, we use fire directly or indirectly. We use matchsticks for lighting the lamp and also for many other things. The matchsticks have phosphorus and let us now find out more about phosphorus....  Phosphorus: The Bringer of Light Ever since man discovered fire, it has been an indispensable aspect of our everyday life. Wondering what phosphorus has to do with fire? Keep reading... Let there be Light (Phosphorus) Phosphorus has the ability to ignite readily and hence is used as the main constituent in the heads of matches. It smoulders in air, and when it is warmed, it bursts into flames thereby producing thick, acidic smoke. In the late 17th century, a German alchemist named Hennig Brandt heated the solid residue that was formed by the evaporation of urine. The distilled vapour glowed in the dark. As a result of this observation, Brandt named...
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Why does a kitchen gas burner glow yellow when liquid comes in contact with it?

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If you have been in the kitchen when your mother boils some water or milk, you may notice the flame of the gas burner turns yellow when liquid comes in contact with the flame. Did you know that there is chemistry at work behind this? The story of sodium ions A natural gas flame is yellow because of burning sodium atoms or ions. Water consists of salt dissolved in it. Common salt is sodium chloride. This is why you may notice that water that falls on the burners grill and evaporates leaves a white residue left on it. This white residue is salt. At the same time the sodium ionizes releasing photons that give the yellow. You may have also seen this yellow emission of sodium atoms in sodium lamps, which produce yellow light due to this reason. Even the tail of the Hale-Bopp comet is yellow for the same reason. The colour of a flame The colour of a flame is also determined by the oxygen that is available to it. You may see that in your school chemistry lab the B...
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