catalyst refers to a substance that speeds up chemical reactions.
catalyst refers to a substance that speeds up chemical reactions.
it refers to a substance that speeds up chemical reactions?
catalyst
autocatalysis









































a single chemical reaction is said to be autocatalytic if one of the reaction products is also a catalyst for the same or a coupled reaction. such a reaction is called an autocatalytic reaction.









































a "set" of chemical reactions can be said to be "collectively autocatalytic" if a number of those reactions produce, as reaction products, catalysts for enough of the other reactions that the entire set of chemical reactions is self-sustaining given an input of energy and food molecules (see autocatalytic set).









































section::::chemical reactions.









































a chemical reaction of two reactants and two products can be written as
autocatalysis
chemical change









































chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.
chemical change