Chapter 8 - Part 1

Chapter 8 - Part 1 - 1010 Chapter 8 part 1 Lecture 20...

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1010 Chapter 8 part 1 Lecture 20 (April 5th) Agenda: Chapter 8 Energy Conversion Units Types of Energy Types of Systems Enthalpy Problem solving Midterm take up Midterm return
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Thermochemistry: Chemical Energy Chapter 8 Stability of components in the chemical reaction If products are more stable than the reactants then the reaction will proceed in forward direction Stability involves energy Less stable compound (with higher energy) will be converted into a more stable compound (with less energy) Defining stability with energy is called thermochemistry
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Energy Energy : The capacity to supply heat or do work. Work: directed energy change resulting from a process. Kinetic Energy ( E K) : The energy of motion. Potential Energy ( E P) : Stored energy or energy available by virtue of an object’s position 2 2 1 mv E K =
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Energy Other types of energy : Radiant energy ( Solar energy ): Energy which comes from the sun. Heats the atmosphere and Earth’s surface. Thermal Energy : The kinetic energy of molecular motion and is measured by finding the temperature of an object. Chemical Energy: The potential energy stored within the structural units of chemical substances. It is released, stored or converted through chemical reactions.
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Common Conversion Factors Energy Energy: SI Unit = joule (J) 1 joule (J) = = = = = 0.2390 cal 1 kg m2/s2 1 N•m 1 W•s 0.001 kJ 1 kWh = 3.6 x 106 J 1 BTU = = = 252 cal 0.293 W•h 1.055 kJ
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Energy Changes and Energy Conservation Law of Conservation of Energy : Energy cannot be created or destroyed; it can only be converted from one form to another. Total Energy = E K + E P
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Energy Changes and Energy Conservation Total Energy = E K + E P
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Energy Changes Almost all chemical reactions absorb or produce energy often in the form of heat. Heat : The amount of thermal energy transferred from one object to another as the result of a temperature difference between the two. Thermochemistry : is the study of heat change in chemical reactions.
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Energy Changes Before analyzing energy changes a system must be defined. System
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This note was uploaded on 10/25/2011 for the course CHEM 1010 taught by Professor Olga during the Spring '11 term at UOIT.

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Chapter 8 - Part 1 - 1010 Chapter 8 part 1 Lecture 20...

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