Catalysts | Chemistry | Khan Academy

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Catalysts are chemicals that help chemical reactions proceed faster rate. But the catalyst itself is not consumed in the reaction. There are a variety of ways that a catalyst causes the rate to increase. In all cases, the catalyst speeds up a reaction by lowering the activation energy. An enzyme is a substance produced by a living organism that acts a catalyst in biochemical reactions.

Sections:
00:00 - Introduction to catalysts and reactants
00:26 - Reaction example and simplified reactant model
01:15 - Energy diagram and activation energy
02:43 - How catalysts affect activation energy
03:24 - Enzymes as biological catalysts
04:21 - Role of enzymes in facilitating reactions
04:55 - Importance of enzymes in biological systems

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