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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.
Three power plants have been suggested that operate at these efficiencies. Plant Power Plant Efficiency (%) I 81
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i wnted a project on the topic law of chemical combinations which will include intro, theory nd sm pics. ....... plz. i need it by 14th of june plz. help me out
How many moles of octane must be burned to release 525.1 kcal ?
Strategy 1 Wheat flour F 3940 g is, mixed with 60g of A, B and C, yielding a ratio of chemicals to flour of 3:197 in all formulations. All mixtures are produced in total amoun
Safety in Preparation of Preparation of trimethyl: 1 Use a round-bottomed flask equipped with a Claisen head (lagged with glass-wool), Quickfit thermometer (very expensive!)
Q. How to balance a redox equation? Ans. Redox equations may be written and balanced by the ionic half-reaction method. Let's use the half-reaction method to balance the f
Q. What are Native Minerals? These minerals contain the metal in free or elemental state, e.g., copper, silver, gold, platinum and iron. The metals are usually found mixed with
types of electrochemical cells any 5
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