4.5+The+effect+of+catalyst

** The Effect of Catalyst: ** ** Key points to remember: ** Next>
 * A catalyst is a substance which increases the rate of a chemical reaction, but it is not affected chemically itself at the end.
 * A catalyst is not used up in the reaction so it can be used over and over again to speed up the conversion of reactants to products.
 * Different catalysts are used with different reactions.
 * Many of the catalyst used in industry are transition metals or their compounds.
 * Catalysts are often very expensive because they are made of precious metals, but it is often cheaper to use a catalyst than to pay for all the energy needed for higher temperatures.
 * **//A catalyst speeds up the rate of a chemical reaction.//**
 * **//A//** **//catalyst is not used up during a chemical recation.//**