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Energy and Enzymes Section 2.4
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Chemical Reactions Reactions create energy transfer
Energy – the ability to do work or cause changes Chemical reaction: Reactants Products Ex. H2O + CO2 H2CO3 Reactions create energy transfer Exergonic Reactions - __________ free energy
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Chemical Reactions Reactions create energy transfer
Energy – the ability to do work or cause changes Chemical reaction: Reactants Products Ex. H2O + CO2 H2CO3 Reactions create energy transfer Exergonic Reactions - ___release_ free energy Endergonic Reactions - _________ free energy
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Chemical Reactions Reactions create energy transfer
Energy – the ability to do work or cause changes Chemical reaction: Reactants Products Ex. H2O + CO2 H2CO3 Reactions create energy transfer Exergonic Reactions - ___release_ free energy Endergonic Reactions - __absorb_ free energy
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Activation energy – energy needed to start a reaction.
Catalysts – chemical substances that reduce the amount of activation energy needed for a reaction. Ex. _______
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Enzymes Enzymes speed up reactions by lowering the activation energy needed for a reaction Enzyme binds to substrate Enzymes are substrate-specific (1E = 1S) (like a lock and key)
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Factors that affect Enzyme Activity
Temperature Concentration pH Regulatory molecules
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