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DISCOVERY OF SUB-ATOMIC PARTICLES The atomic theory of the Greek philosophers, Leucippus and Democretus (400 B.C.) held that continued subdivision of matter would ultimately yield atoms which would not be further divided. The word 'atom' is derived from the Greek word, aromos, which means "uncut" or indivisible. Dalton (1808) based his atomic theory on the ideas of Democretus and was able to explain the laws of chemical combination. Toward the end of nineteenth century, it began to appear that the atom itself might be composed of even smaller particles. This discovery was brought about by experiments with electricity. Attempts to pass a high voltage electric current through gases under reduced pressure led to Julius Plucker's discovery (1859) of cathode rays, Fig. 1.1. The cathode rays stream from the negative electrode, which is called the cathode. These rays consist of negatively charged particles which travel in straight lines. The cathode rays give off flashes of light, when they strike a screen coated with substances like zinc sulphide. The picture tubes in television sets and computer monitors, function on this principle.
Q. Explain Preservation by Preservatives? Preservatives, as you may already know, belong to a class of food additives that extend shelf life by inhibiting microbial growth, o
Why rate of reaction in zero order is independent of concentration? Solution) Where r is the reaction rate and k is the reaction rate coefficient with units of time / concentrat
potentiometric titration
what can be understood from the law of multiple proportions?
full mettallurgy
explain why boiling and meliting points of nitroalkanes than that of iosmeric alkyl nitrites
Sometimes more than one valence structure is possible and there shows to be no unique assignment. A familiar organic example is in the disposition of single and double C-C bonds in
what is chemical cobination
Q. What do you know about Radioactive Dating? Ans. Half-life measurements of radioactive elements in rocks and fossils can be used to determine the age of the specimen. On
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