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• Select Chemical Reactions

  1

  Chemical Reactions

  Authors:K. Lee Lerner and Pang-jen KungFrom:The Gale Encyclopedia of Science (Vol. 2. 6^th ed.)

  20211,866 words Topic overview 1270LChemical reactions describe the changes between reactants (the initial substances that enter into the reaction) and products (the final substances that are present at the end of the reaction). Chemical reactions involve...
• Select Catalyst and Catalysis

  2

  Catalyst and Catalysis

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 2. 6^th ed.)

  20211,981 words Topic overview 1220LA catalyst is a substance that initiates or accelerates the rate of a particular chemical reaction without itself being chemically affected. A catalyst can be added to a reaction and then be recovered and reused after...
• Select Enzyme

  3

  Enzyme

  Author:Leonard D. HolmesFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  20212,134 words Topic overview 1240L  Enzymes are biological catalysts. A catalyst is an agent that increases the rate of chemical reactions (the speed at which the reactions occur) without being used up or altered in the reaction. Enzymes are also...
• Select Semenov, Nikolai Nikolaevich (1896-1986)

  4

  Semenov, Nikolai Nikolaevich (1896-1986)

  From:Encyclopedia of World Biography

  1998564 words Biography 1590LBIOGRAPHICAL ESSAY The Russian physicist and physical chemist Nikolai Nikolaevich Semenov (1896-1986) is famous for his experiments explaining chemical reactions by means of the mechanism of chain reactions....
• Select Hinshelwood, Sir Cyril Norman (1897-1967)

  5

  Hinshelwood, Sir Cyril Norman (1897-1967)

  From:Encyclopedia of World Biography

  1998730 words Biography 1460LBIOGRAPHICAL ESSAY The English chemist Sir Cyril Norman Hinshelwood (1897-1967) was noted for his contributions to reaction kinetics. Cyril Hinshelwood was born in London on June 19, 1897, the only child of an...
• Select Polanyi, John Charles (1929-)

  6

  Polanyi, John Charles (1929-)

  From:Encyclopedia of World Biography

  19981,085 words Biography 1450LBIOGRAPHICAL ESSAY John Charles Polanyi (born 1929) was a Hungarian scientist whose work with chemical reactions led to the construction of a "chemical laser" and to a share of the 1986 Nobel Prize in Chemistry....