ch.5 - 9/26/2009 Chemistry, Energy and Time or A small oil...

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9/26/2009 1 Chemistry, Energy and Time or A small oil lamp An exploding Titan IV rocket (1998) What makes one chemical reaction slow and controlled while the other chemical reaction is explosive? or A small oil lamp An exploding Titan IV rocket (1998)
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9/26/2009 2 The complete answer is somewhat complicated, but we can start to learn about the most basic and critical aspects of it. or A small oil lamp An exploding Titan IV rocket (1998) Both reactions “produce” Heat/Energy! Thermodynamics or A small oil lamp How much Energy is released per mole of reactant? An exploding Titan IV rocket (1998)
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9/26/2009 3 Both reactions “produce” Heat/Energy! Kinetics or A small oil lamp How fast is the reaction – how many moles react per second? An exploding Titan IV rocket (1998) What are the Goals (Chapter 5)? Learn what Energy and Thermodynamics are. Understand basic terms: System, Surroundings, Work, Heat Understand what Enthalpy is . Learn that chemical reactions cause changes in Enthalpy – quantitative.
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9/26/2009 4 Thermodynamics - study of energy changes during physical and chemical changes Thermochemistry – study of energy changes during chemical reactions ENERGY ( E ) = capacity to do work or transfer heat HEAT ( q ) = energy transferred from a hotter object to a cooler one Units of energy: JOULE, J kg • m 2 s 2 J = Also: kJ, cal, kcal Note: 1 cal = 4.184 J 1 calorie (cal) is the amount of heat energy needed to warm
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ch.5 - 9/26/2009 Chemistry, Energy and Time or A small oil...

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