A substance that speeds up a chemical reaction but is not consumed or altered in the process. Catalysts are of immense importance in chemistry and biology. All enzymes are catalysts that expedite the biochemical reactions necessary for life. The enzymes in saliva, for example, accelerate the conversion of starch to glucose, doing in minutes what wo [..]

[Gk. katalysis, dissolution] A substance that lowers the activation energy of a chemical reaction by forming a temporary association with the reacting molecules; as a result, the rate of the reaction [..]

A substance that increases the rate of a chemical reaction, without being consumed or produced by the reaction. Catalysts speed both the forward and reverse reactions, without changing the position of [..]

An event or piece of information that causes the marketplace to re-evaluate the prospects of a company.

"substance which speeds a chemical reaction but itself remains unchanged," 1902, formed in English (on analogy of analyst) from catalysis. Figurative use by 1943.

substance that causes or quickens a chemical reaction, without being affected by it.

A catalyst increases the rate of a chemical reaction, without itself being consumed in the reaction. Certain metal compounds can act as a catalyst in the ‘drying’ (polymerisation) of oils and may have [..]

One who brings people and their ideas together. [D02451]

A substance that that promotes chemical reactions without itself being consumed in the process.

(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected something that causes an important event to happen; "the invasion acted as a cataly [..]

A substance that initiates or increases the rate of a chemical reaction, without itself being used up in the process.

A catalyst is a substance which starts or speeds up a chemical reaction without being affected by that reaction.

In chemical reactions, an agent that influences the reaction but remains unchanged.

A catalyst is a subtance that increases the rate of a chemical reaction by reducing the activation energy, but which is left unchanged by the reaction. Examples: A piece of platinum foil is a catalyst [..]

A substance that accelerates a chemical reaction but does not become a part of the end product. catastrophic systems

Product used to speed up chemical reactions without being used up.

n. any substance which significantly increases the speed of a chemical reaction. It is only required in small amounts compared to that of the reactants, and yet it is not used up by the reaction. Alth [..]

A chemical substance that accelerates the rate of a chemical reaction by lowering the energy of activation required for the chemical reaction to occur.

A substance which alters (initiates or accelerates) the velocity of a reaction between two or more substances without changing itself in chemical composition.

  A substance that reduces the activation energy of a reaction.

Substance that speeds up the rate of reaction without being used up in the process, so that relatively small amounts can catalyse relatively large amounts of reactants.

(Gk: kata=down, downwards; luo= to set free) substance that speeds up a chemical reaction but which is not itself catchment area= the area draining into a lake, river or other body of water. See water [..]

A substance which accelerates a chemical reaction but appears to remain unchanged itself (i.e. a hardener that accelerates the cure of synthetic resin adhesive).

A compound that lowers the activation energy of a reaction without itself being consumed.

A substance that participates in a chemical reaction but whose concentration is unchanged as a result of the reaction. It participates in the reaction's intermediate stages, effectively lowering the relevant activation energy.

A substance that initiates or accelerates a chemical reaction without itself being affected

A substance that increases the rate of a chemical reaction without itself undergoing any permanent change.

A substance that increases the rate of a chemical reaction, but is not itself changed during the reaction. Enzymes are catalysts for many biochemical reactions.

A substance that increases the rate of reaction but is not itself consumed in the reaction.

 Substance whose presence increases the rate of a chemical reaction, e.g., acid catalyst added to an epoxy resin system to accelerate drying time.

substance that speeds up or slows down chemical reactions, but is not itself changed by the reaction; a substance that speeds up or slows down the rate of a reaction without being consumed or altered. [..]

A substance that changes the rate of a chemical reaction without itself undergoing a permanent change or becoming part of the molecular composition of the product.

is news or information that changes a pricing trend in a security.

Compound that facilitates a reaction without being altered in the process.

(n) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected(n) something that causes an important event to happen

A substance used to speed up a chemical reaction but that is not consumed in the reaction (Lesson 12)

something that triggers or increases the rate of a chemical reaction

A substance that increases the rate of a chemical reaction without being consumed or produced by the reaction. Enzymes are catalysts for many biochemical reactions.

a substance that changes the rate at which a chemical reaction takes place without taking part in the reaction itself.

A chemical additive that decreases the time of a chemical reaction with out being affected by the reaction.

A chemical agent which promotes or influences a chemical reaction without itself being permanently changed by the reaction. Used in recombinant cells and fuel cells

A substance that increases the rate of a chemical reaction without undergoing a permanent change in its structure. Enzymes are protein catalysts.

A catalyst increases the rate of a reaction without itself being consumed. In a fuel cell catalysts are used for the electrodes (to break down hydrogen into electrons and protons).

a substance that markedly speeds up the cure of an adhesive when added in minor quantity as compared to the amounts of the primary reactants. (See also hardener and inhibitor)

Substances that will speed up or slow down a chemical reaction.

A substance that changes the rate of a chemical reaction when it is mixed with another substance and…

A material which speeds up or stimulates a chemical reaction without being significantly chemically altered by the reaction.

A substance that participates in a particular chemical reaction and thereby increases its rate but without a net change in the amount of that substance in the system. At the molecular level, the catalyst is used and regenerated during each set of microscopic chemical events leading from a molecular entity of reactant to a molecular entity of produc [..]

a substance that alters the velocity of a chemical reaction and may be recovered essentially unaltered in form and amount at the end of the reaction.

Substance that speeds up a chemical process without actually changing the products of reaction.

A substance that can make a chemical reaction faster but which is not actually needed to produce the reaction nor is used in the reaction.

a substance that changes the speed of a chemical reaction without affecting the yield or undergoing permanent chemical change.

Illustrated Glossary of Organic Chemistry Catalyst: A substance that increases reaction rate by altering the reaction mechanism. A true catalyst is regenerated at some point in the reaction mechanism, [..]

A catalyst is a compound or element that can increase the rate of a chemical reaction. Catalysts can lower activation energy of a reaction to help a reaction proceed faster and with less energy. More [..]

A substance that accelerates chemical change yet is not permanently affected by the reaction (e.g., platinum in an automobile catalytic converter helps change carbon monoxide to carbon dioxide).

A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.

A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.

A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.

is a substance that can increase or decrease the rate of a chemical reaction between the other chemical species without being consumed in the process.

A chemical used to change the rate of a chemical reaction. Differs from a curing agent/hardener in that the catalyst is not itself chemically consumed in the reaction while a curing agent is.

Compound that accelerates the rate of a chemical reaction, and is not itself consumed in the reaction.

a chemical used to activate polyester resins and other polymer compounds to make them solidify

Any substance which, by virtue of its presence, affects the rate of a chemical reaction and which may be recovered practically unchanged at the end of the reaction.

A substance that increases the rate of a chemical reaction by reducing the activation energy. The substance is left unchanged by the reaction.

a substance used that speeds up the rate of a reaction, without itself being changed by the reaction

A compound that lowers the activation energy of a reaction without itself being consumed. With a catalyst, reactions occur faster and with less energy. Because catalysts are not consumed, they are rec [..]

A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.

A substance that speeds up a chemical reaction, but is not itself changed during the reaction.

A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction. Cation

A substance that can speed up the rate of a chemical reaction, often an enzyme.

A substance which makes some chemical reaction happen faster, but is not itself consumed in the reaction.

A substance that facilitates a chemical reaction, but which itself is not chemically changed by the reaction.

A substance used to modify or increase the rate of a reaction without being consumed in the process. (Taken from cosmetics organic and natural standard)

A substance that can increase or decrease the rate of a chemical reaction between the other chemical species without being consumed in the process.

A material which promotes the rate of a chemical reaction, and which may 1 involved in the reaction itself. However, at the end of the reaction, it is essentially unchanged.

A substance which initiates or accelerates a chemical reaction.

A substance that increases the rate of a chemical reaction without itself being permanently changed.

Substance that, by its presence, modifies the speed of a chemical reaction without changing in the process.

1. A substance that initiates a chemical reaction and allows it to continue under less than favourable conditions. 2. An agent that provokes significant change.

a substance which speeds a chemical action without undergoing a chemical change itself during the process.

A substance used to accelerate or retard a chemical reaction without itself undergoing significant chemical change or change in volume during the process.

A compound that increases the speed with which a chemical reaction occurs, but which does not enter into the reaction. A catalyst can be recovered after a reaction is over and reused.

A material that aids or promotes a chemical reaction between other substances but does not react itself

A substance which aids or promotes a chemical reaction without forming part of the final product. It enables the reaction to take place faster, remains unchanged at the end of the reaction and can provide control by increasing desirable reactions and decreasing undesirable reactions.

A substance that speeds up the rate of a chemical reaction without being altered or depleted in the process.