· A catalyst is a substance which increases the rate of a chemical reaction but not affected chemically itself at the end of the reaction. It 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.
· A catalyst is usually used when the previous methods are impossible to use or it is too expensive to increase the pressure or temperature.
· We need to use different catalysts with different reactions. Many of the catalysts used are transition metals or there compounds. For example, Iron is used in the Haber process.
· Catalysts are often very expensive because they are made of precious metals. But it is often cheaper to use than to pay for all the energy needed to increase the temperature or pressure of a reaction.
· Usually, catalysts provide a platform/surface for the reacting particles to come together. They lower the activation energy needed for the particles to react. This means that more of the collisions between particles result in a reaction taking place.
· Catalysts are usually powdered so they have a bigger surface area.
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