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~~A Catalyst
A Catalyst - раздел Образование, Part One THE PREDICATE A Catalyst Is A Substancc That Alters The Speed Of A Chcmical Reaction Withou...
A catalyst is a substancc that alters the speed of a chcmical reaction without itself undergoing any chcmical change, usually only a small quantity of it is required.
Catalysts arc usually specific in action; thus, a catalyst for one reaction is more often than not useless for any other reaction. They are extremely important substances not only in the laboratory but also in chcmical industry and in biological systems. Thus, the manufacture of sulphuric acid, ammonia and margarine involves the application of catalysts, the most of the chcmical reactions that occur in our bodies arc regulated by these substanccs. In biological systems substanccs called enzymes function as catalysts, c. g., specific enzymes arc used to aid the digestion of food in the stomach.
Chemists have discovered the great majority of reactions that proceed without catalysts. But there arc almost innumerable other reactions that cannot be practically effected widiout a catalyst.
The phenomenon in which a relatively small amount of a foreign material, callcd a catalyst, augments the rate of a chcmical reaction is called catalysis.
A catalyst provides the possibility of new elementary processes taking placc, but it is not consumed during the reaction. If wc cannot have it regenerated, there is no catalysis.
