Chemical Reactions, Energy & enzymes

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Presentation transcript:

Chemical Reactions, Energy & enzymes

Endothermic & Exothermic Reactions Reactions that absorb energy are endothermic. (endergonic) Ex: making glucose. Exothermic: Reactions that release energy (exergonic) Ex: breaking down glucose

Chemical Reactions And Activation Energy Activation energy is needed to start the chemical reaction. Catalysts reduce the amount of activation needed. Activation energy

Enzymes reduce activation energy Catalysts Enzymes are biological catalysts used by cells. Enzymes are proteins produced by the cell. Enzymes reduce activation energy

Enzyme - substrate complex Enzyme function depends on the physical fit to a substrate. The substrate is the reactant The enzyme and substrate must match like a lock and key. Enzyme - substrate complex

Reaction rate There are many factors that can change the rate of a reaction. Concentration of reactants, surface area, temperature, pH, and enzyme concentration.

enzymes have optimal conditions Change in pH or temperature can effect function. 80˚ C will change the enzyme’s shape. Acids or bases can alter enzymes shape.