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chemical equilibrium

From The Columbia Encyclopedia
state of balance in which two opposing reversible chemical reactions proceed at constant equal rates with no net change in the system. For example, when hydrogen gas, H 2 , and iodine gas, I 2 , are mixed, and gaseous hydrogen iodide, HI, is formed according to the equation H 2  + I 2  → 2HI, no matter how long the reaction is allowed to proceed some quantity of hydrogen and iodine will remain unreacted. The reason reactants in a reversible reaction are never completely converted to product is that an opposing reaction is taking place simultaneously, i.e., some of the newly formed HI is being converted back into hydrogen and iodine. For any particular temperature, a point of equilibrium is reached at which the rates of the two opposing reactions are equal and there is no further change in the system. This equilibrium point is characterized by specific relative concentrations of reactants and products and will also be reached from the opposite direction, i.e., if one starts with…
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Full text Article chemical equilibrium

From The Columbia Encyclopedia
state of balance in which two opposing reversible chemical reactions proceed at constant equal rates with no net change in the system. For example, when hydrogen gas, H 2 , and iodine gas, I 2 , are mixed, and gaseous hydrogen iodide, HI, is formed according to the equation H 2  + I 2  → 2HI, no…
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Full text Article chemical equilibrium

From Science Encyclopedia: Encyclopedia of Chemistry
Also known as: law of chemical equilibrium Reversible processes can be made to proceed in the forward or reverse direction by the (infinitesimal) change of one variable, ultimately reaching a point where the rates in both directions are identical, so that the system gives the appearance of having a…
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Full text Article chemical equilibrium

From The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide
Condition in which the products of a chemical reaction are formed at the same rate at which they decompose back into the reactants, so that the concentration of each reactant and product remains constant. It is a reversible reaction ; the reaction can happen in both directions. For example, in the…
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Full text Article chemical equilibrium

From Science Encyclopedia: Encyclopedia of Chemistry
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Full text Article chemical equilibrium

From The New Dictionary of Cultural Literacy, Houghton Mifflin
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Full text Article CHEMICAL EQUILIBRIUM

From Gaither's Dictionary of Scientific Quotations
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Full text Article equilibrium, chemical

From Britannica Concise Encyclopedia
Condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs: Products are reverting to reactants at the same rate as reactants are forming products. For practical purposes, the reaction under those conditions is completed. …
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Full text Article equilibrium, chemical

From The Penguin Dictionary of Science
That composition of a chemical reaction where there is no further net change in the reaction mixture. Individual molecules continue to react, but for every forward reaction there is a compensating backward one; the equilibrium is dynamic. The equilibrium constant for the reaction is defined as where…
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Full text Article chemical equilibrium

From Philip's Encyclopedia
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