Catalysts effectively make an environment the promotes a reaction. They mostly do this two ways: they make a physical pocket that two molecules fit into so they line up just right, and they have atoms that have hydrogen or electrons positioned to push/pull electrons on molecules in a way that favors a reaction. Some also temporarily lend an electron or hydrogen to a reaction.
The catalyst is not consumed because it’s not changed when the reaction it catalyzes takes place. All it does is make the reaction more favorable and quicker / require less energy to happen.
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