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Biology Chapter 8A Notes

by: Angelica Reed

Biology Chapter 8A Notes BIOL 1100

Angelica Reed
Principles of Biology
Dr. Voytek

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Here you go!
Principles of Biology
Dr. Voytek
Class Notes
BIOL, BIOL 1100, Biology, Principles of biology, Chapter 8, 8
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This 0 page Class Notes was uploaded by Angelica Reed on Monday February 22, 2016. The Class Notes belongs to BIOL 1100 at East Carolina University taught by Dr. Voytek in Winter 2016. Since its upload, it has received 27 views. For similar materials see Principles of Biology in Biological Sciences at East Carolina University.


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Date Created: 02/22/16
Energy in chemical reactions 0 Kinetic energy Energy of motion Molecular level is thermal energy 0 Potential energy Energy of position or con guration Molecular level chemical energy is stored 0 Free energy Of a reaction is the amount of energy available to do work NOT POTENTIAL ENERGY 0 Chemical potential energy In cells Electrons are the source 0 Potential energy is based on lts position relative to positive and negative charges 0 Electrons closer to negative charges and farther from positive charges Have higher potential energy 0 Molecular potential energy Is a function of electron con guration and position Thermodynamics 0 Energy is conserved rst law 0 Cannot be created or destroyed Enthalpy 0 Potential energy of the molecule heat content 0 Effects of the molecule on surrounding pressure and volume 0 Changes in enthalpy are represented by enthalpy 0 Different in heat content Exothermic reaction 0 Products have less potential energy than reactants 0 Delta G is less than 0 Endothermic reaction 0 Heat energy is taken up 0 Products have higher potential energy than reactants 0 Delta G is greater than 0 Entropy 0 Amount of disorder 0 When the products of a chemical reaction become less ordered than the reactant molecules Entropy increases 0 Second law Total entropy always increases in isolated systems Gibbs free energy change 0 Determines whether a reaction is spontaneous o Gibbs free energy change change in enthalpy minus temperature in degrees kelvin times change in entropy The Eihb Energy lEhWEE m Temperature Change in fine EarWham always rs El Gibbs Energy a hng always 4quot ID V 9 V a AG Al l ms WillJ Charge of Entropy Pmm ES r El more distorer 5 a Cl increased ordar Temperature and concentration affect reaction rates 0 One or more chemical bonds have to break 0 Substances must collide in a speci c orientation that brings the electrons involved near each other 0 When the temp increases more collisions occur 0 When the concentration is high more collisions occur Energetic coupling 0 Between exergonic and endergonic reactions 0 Allows chemical energy released from one reaction 0 To drive another reaction Think of falling dominoes Redox reactions 0 Reductionoxidation reactions Are chemical that involve electron transfer 0 When an atom or molecules gains an electron It is reduced Reduction gain of one or more electron and a hydrogen ion H o Loses an electron Oxidized Ox idatio n loss of one or more electrons o Oxidation and reduction events are always caupled Electron a re always sha red via receptors a Pmtons are also H


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