Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. All rights reserved.a substance that causes or accelerates a chemical reaction without itself being affected.something that causes activity between two or more persons or forces without itself being affected.a person or thing that precipitates an event or change: His imprisonment by the government served as the catalyst that helped transform social unrest into revolution.a person whose talk, enthusiasm, or energy causes others to be more friendly, enthusiastic, or energetic.a substance that increases the rate of a chemical reaction without itself suffering any permanent chemical changeA substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reaction without being consumed in the process.A substance that starts or speeds up a chemical reaction while undergoing no permanent change itself. Published by Houghton Mifflin Harcourt Publishing Company. In contrast, heterogeneous catalysis describes processes where the catalysts and substrate are in distinct phases, typically solid-gas, respectively. But, can a catalyst be a person?But the copper performs another important function: working as a The senator's 13-hour filibuster of the confirmation of John Brennan to be CIA director last March was the I have some scientific knowledge myself about the powers of this “Affect” vs. “Effect”: Use The Correct Word Every TimeAll Of These Words Are Offensive (But Only Sometimes)What Is The Difference Between “Furlough” vs. “Layoff”?Why Do “Left” And “Right” Mean Liberal And Conservative?Absentee Ballot vs. Mail-In Ballot: Is There A Difference?“Epidemic” vs. “Pandemic” vs. “Endemic”: What Do These Terms Mean?Don’t be verecund—we know you remember these popular words from July. Catalyst definition, a substance that causes or accelerates a chemical reaction without itself being affected. Word History of catalyst
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins . All rights reserved.The New Dictionary of Cultural Literacy, Third Edition As you will see from the above diagram, the actual thermodynamics and end product of the reaction remains the same whether a catalyst is present or not.. Catalysts react with one (or more) of the reactants to form an intermediate product. ‘Catalyst recovery is one of the most actively researched areas for cost-cutting in the chemical industry, as catalysts often contain rare and expensive metals.’ ‘When temperature is increased, synthetic catalysts can become just as active as enzymes.’ Delivered to your inbox! See more. A catalyst means "something that causes activity, an event, or change." The bombing attack was the She was proud to be a The hope is years from now the Fast Forward Fund -- which is viewed as a short-term program -- will be looked back as the Creative projects, including musical study, will provide a It can also be used by recreational fishers, and leaders hope the park will be a Mississippi civil rights leader, Amzie Moore, called Till the Cargle, whose foundation provides mental health resources for Black girls and women, cited a recent restful weekend of her own as the The 14-member working group, facilitated by Dallas County Administrator Darryl Martin, is meant to serve as a catalyst definition: The definition of a catalyst is someone or something that speeds up or brings about an event. How to use catalyst in a sentence. Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012The American Heritage® Stedman's Medical Dictionary Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!Learn a new word every day. And usually, these events and changes are big. Published by Houghton Mifflin Company.The American Heritage® Science Dictionary Catalyst definition is - a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temperature) than otherwise possible. Published by Houghton Mifflin Harcourt Publishing Company. catalyst in the Chemistry topic by Longman Dictionary of Contemporary English | LDOCE | What you need to know about Chemistry: words, phrases and expressions | Chemistry Catalysts synonyms, Catalysts pronunciation, Catalysts translation, English dictionary definition of Catalysts.