chapt06_lecture - Energy and Metabolism Chapter 6 Flow of...

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Energy and Metabolism Chapter 6
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2 Flow of Energy Energy : the capacity to do work - kinetic energy : the energy of motion - potential energy : stored energy Energy can take many forms: mechanical electric current heat light
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3 Flow of Energy Most forms of energy can be converted to heat energy. Heat energy is measured in kilocalories . One calorie = the amount of heat required to raise the temp of water by 1 o C 1 kilocalorie (kcal) = 1000 calories
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4 Flow of Energy Potential energy stored in chemical bonds can be transferred from one molecule to another by way of electrons. oxidation : loss of electrons reduction : gain of electrons redox reactions are coupled to each other.
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6 Laws of Thermodynamics First Law of Thermodynamics – energy cannot be created or destroyed -energy can only be converted from one form to another For example: sunlight energy chemical energy photosynthesis
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7 Laws of Thermodynamics Second Law of Thermodynamics : disorder is more likely than order entropy : disorder in the universe The 2 nd Law of Thermodynamics states that entropy is always increasing.
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9 Laws of Thermodynamics Free energy : the energy available to do work -denoted by the symbol G (Gibb’s free energy) enthalpy : energy contained in a molecule’s chemical bonds free energy = enthalpy – (entropy x temp.) G = H - TS
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10 Laws of Thermodynamics Chemical reactions can create changes in free energy: 2200 G = H
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chapt06_lecture - Energy and Metabolism Chapter 6 Flow of...

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