Chapter5_1 - 9/25/2011 CHEMISTRY 1307 Chapter V Principles...

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9/25/2011 1 1 CHEMISTRY 1307 Chapter V Principles of Chemical Reactivity: Energy and Chemical Reactions 2 Energy & Chemistry Questions that need to be addressed: How do we measure and calculate the energy changes that are associated with physical changes and chemical reactions? What is the relationship between energy changes , heat , and work ? How can we determine whether a chemical reaction is product-favored or reactant-favored at equilibrium? How can we determine whether a chemical reaction or physical change will occur spontaneously , that is, without outside intervention? 3 Energy & Chemistry Some Basic Principles Energy is the capacity to ___ work or ________ heat (q). Heat (q) is _____ temperature, temperature is a measure of _____________. Energy is divided into two basic categories: ______________ (energy that results from an object s position). _______________ (the energy associated with motion) The law of conservation of energy requires that energy can neither be __________nor __________. However, energy can be ___________ from one type into another.
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9/25/2011 2 4 Potential & Kinetic Energy Energy can be divided into two forms: Potential : Stored energy : Gravitational Electrostatic Chemical & Nuclear Kinetic : Energy of motion : Thermal Mechanical Electrical 5 Potential & Kinetic Energy Potential energy — energy a __________ body has by virtue of its composition and position. 6 Potential & Kinetic Energy Gravitational energy hold something up hydroelectric Chemical energy gasoline battery Electrostatic separation of charge Nuclear energy bomb power plant All are ___________ ENERGY
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9/25/2011 3 7 Potential & Kinetic Energy Kinetic energy — energy of __________ • Translation 8 Potential & Kinetic Energy • All substances have kinetic energy no matter what physical state they are in. • Solids have the _______ kinetic energy, and gases have the _______ kinetic energy. • As you increase the temperature of a substance, its kinetic energy _________. 9 Potential & Kinetic Energy Kinetic energy energy of motion. translate rotate vibrate Mechanical: moving objects wind Electrical: motion of electrons in a conductor Acoustic: compression & expansion Molecular level: translation rotation vibration All are ________ ENERGY!
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9/25/2011 4 10 Law of Conservation of Energy • Just like matter, energy cannot be created or destroyed, but it can be converted from one form to another.
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This document was uploaded on 10/30/2011 for the course CHEM 1307 at Texas Tech.

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Chapter5_1 - 9/25/2011 CHEMISTRY 1307 Chapter V Principles...

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