a catalyst is a substance that affects the rate of rxn without actually being consumed in the rxns . a catalyst doesnt become a part of the products. catalystss are of two types 1 POSITIVE CATALYST . it increases the rate of rxn . that is the products are formed faster . eg sunlight in a photochemical rxn is a positive catalyst 2 NEGATIVE CATALYST - which slow down a rxn . like addition of glyceriene to hydrogen peroxide slows down its decomposition
Somthing that helps to speed things up. example: an enzyme is a biological catalyst, it speeds things up
this picture shows how catalysts work. they usually speed up a chemical change.
A catalyst is a substance that increase the rate of chemical reaction without itself undergoing any permanent chemical changeb
A catalyst helps make a reaction go forward faster or slower but a catalyst is not consumed by the reaction itself. The catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts. Catalysts that slow down the reaction are called negative catalysts or inhibitors. Substances that increase the activity of catalysts are called promoters and substances that deactivate catalysts are called catalytic poisons. For instance, in the reduction of ethyne to ethene, the catalyst is palladium (Pd) partly poisoned with lead(II) acetate (Pb(CH3COO)2). Without the deactivation of the catalyst, the ethene produced will be further reduced to ethane
