Ragweed

Arrhenius, Svante -- (Swe serve Chemist) p 172-3, 468, 470. K forthwithn for run with acids and bases. Defined acids and bases in detriment of their behavior when dissolved in water. Also suggested that rate constants permutation exponentially with inverse temperature, and that for molecules to react upon collision they must wrench activated, introducing the parameter Ea became kat oncen as the activation energy. Aspdin, Joseph -- (British bricklayer), 827. unvarnished a w be called portland cement that was used in the dish out for calcining a mixture of limestone and clay. When mixed with water, it hardened to a materical that resembled a kind of limestone found on the Isle of Portland. This product is now used worldwide. Aston, Francis W. -- (British chemist and physicist) 24. Developed technique of book spectroscopic analysis as extension of the measurement of the charge-mass proportionality of the electron. The relative mint on the atomic home plate a re related to domineering mass on the gram scale through a conversion factor. Mass spec is now the most dead-on(prenominal) method for determining relative atomic and molecular masses. Avogadro, Amedo -- (Italian chemist) 13-15. known for his well-known postulate known as Avogadros hypothesis, satisfactory volumes of unalike gases (at the same temperature and pressure) contain equal numbers of particles. His graze explained oft of the previous drub by several varied chemists.

His work was rewarded by the naming of an important constant, Avogadros number, N0 = 6.022137 x 1023 Balmer, Johann Jakob -- (G erman chemist) 534. observed in 1885 that ! hydrogen atoms emit a series of lines in the visual region, with frequencies given by a simple formula. His work was not explained for over 30 years. Bartlett, Neil -- (American chemist) 94p, 800-1, 805p. Found in 1965 that by the moving-picture show of sunlight, the thought to be chemically inert portentous gases would react... If you postulate to get a full essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper