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Answered 2008-10-29 06:28:20

A catalyst. Or if made by a living organism an enzyme.

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An enzyme is a substance that speeds up a reaction by decreasing activation energy, but is not consumed in the reaction.

A catalyst. There are two types of catalyst: * Homogenous: a catalyst in the same state (i.e. solid, liquid, gas) as the reactants. * Heterogenous: a catalyst in a different state than the reactants

The energy provided by absorbing light can substitute for the heat energy that usually accelerates chemical reactions. More fundamentally, any endothermic chemical reaction can occur because an increase in entropy compensates for any heat absorbed by the reaction to make the free energy change negative.

No! A substrate is a reagent in a chemical reaction. Catalyse is the verb form of catalyst; a catalyst is a chemical species that participates in lowering the energy barrier of a chemical reaction and allow a reaction to occur more rapidly. A catalyst is not consumed in a reaction and therefore only a small amount of catalyst is required in any reaction (if required at all), whereas a substrate must be present in the proper stoichiometric amount to allow a reaction to proceed as it is consumed.

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Any substance that speeds up a chemical reaction is called a catalyst.

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