Chapter 4 Chem

Chapter 4 Chem - CH 4: Energy, Chemistry, and Society CH 4:...

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1 CH 4: Energy, Chemistry, and Society CH 4: Energy, Chemistry, and Society Introducing Topics of Discussion 4.1 Energy, Work, and Heat 4.2 Energy Transformation 4.3 From Fuel Sources to Chemical Bonds Announcements H.W. problems due Thursday: 1,2,4,5,9,12,30, and 32 ENERGY? Like the energy of a crowd, You can t see it, Can t measure it, But you know it is there. What do you think of when you hear the word
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2 Our Need For Energy Fossil fuels (coal, oil, and natural gas) Middle East provided us with fossil fuels How long will our fossil fuel reserves last? What s the solution? What is energy? ______________ is the capacity to do work _______ is energy describing movement against a restraining force (i.e., gravity) Much work is performed by heat What is heat? ___________ is energy that flows from a hotter to a colder object; it is a consequence of molecules moving at the molecular level ___________________ is a property that determines the direction of heat flow; this property is a statistical measure of the average speed of molecules in motion
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3 Units of Heat Most common unit is ______________ is the amount of heat necessary to raise the temperature of exactly 1 g of water by 1°C __________________ is the ability of water to store heat Energy Transformation _____________________________ or the Law of Conservation of Energy and Mass states that energy is neither created nor destroyed , but may be transformed from one form to another . Different Forms of Energy ___________________ is the form of energy related to the positions of atoms and molecule structure __________________ is the energy of motion __________________ is the random motion of molecules __________________ is energy associated with the form of electrons (i.e., electric current)
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4 Power Plant: Energy Transformation CH 4 Heat! Work! H 2 O absorbs heat and vaporizes Non-Efficient Energy Transformation _________________________ states that is it impossible to completely convert heat into work with making some other changes in the universe As a result, no power plant can completely convert heat into work Reasons for low efficiency Example Problem
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5 What is entropy? Second Law of Thermodynamics states that is it impossible to completely convert heat into work with making some other changes in the universe General Statement: ____________ is randomness or disorder in energy or position of objects Going Against the 2 nd Law of Therm. Power plants convert heat to work going from
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This note was uploaded on 05/05/2008 for the course CHEM 104 taught by Professor Splawn during the Spring '08 term at Wofford.

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Chapter 4 Chem - CH 4: Energy, Chemistry, and Society CH 4:...

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