BS111-Lecture 8 - Energy, Enzymes, and Metabolism 1 I....

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1 Energy, Enzymes, and Metabolism
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2 I. Energy Unlike matter Energy cannot be seen, touched and weighted. Measure Energy’s effects: Interchanging Types of Energy/Work e.g. Gravitational to electrical
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3 A. Energy/Work in Chemistry Muscle Mechanical Fire Thermal Fuel Cell Electrical Glowworms Light Chemical energy is converted By Into Chemical reactions heat & work
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4 Reaction coordinate motion coordinate ATP hydrolysis: Chemical to mechanical work
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5 B. Stored and Utilized Energy Potential energy Chemical energy (form of potential energy) Kinetic Energy Energy of Motion
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6 C. Conversion between Potential and Kinetic Energy
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7 D. First Law of Thermodynamics : Energy is neither created nor destroyed. When energy is converted from one form to another, the total energy before and after the conversion is the same.
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8 When energy change occurs no energy is created or lost. It is transformed to heat “q” or work “w”
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9 E. Second Law of Thermodynamics Spontaneity of reactions: need to know Energy change (enthalpy, for us) Entropy (disorder) 0 S &
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10 1. Combining enthalpy and entropy G H T S = ∆ - ∆ Gibbs Free Energy: the ability to do work
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11 0, Reaction Spontaneous 0, Reaction not Spontaneous G G <
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12
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13 Don not Worry, just know: G H T S = ∆ - ∆ Page 121 Book
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BS111-Lecture 8 - Energy, Enzymes, and Metabolism 1 I....

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