Chapter 6 (2) - Chapter 6 Energy o Energy = the capacity to...

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Chapter 6 – 9/21/09 Energy o Energy = the capacity to do work o Kinetic energy = energy of movement Light Heat Electricity o Potential energy = stored energy Chemical energy Positional energy Laws of thermodynamics o Conservation of energy Amount of energy in a closed system remains constant o When concerted from one form to another, useful energy decreases Entropy increases There is a constant input of energy from the sun makes it possible for living organisms to comply with the 2 nd law of thermodynamics. How does energy flow in chemical reactions? o Chemical reaction: forming and/or breaking chemical bonds among atoms Reactants: starting materials Products: result of the reaction Coupled reactions o Exergonic reactions provide the energy needed for endergonic reactions. What must be overcome in order for reactants to start reacting? Activation energy How is cellular energy carried between coupled reactions?
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