Ch06 MSJ jlm - Chapter 6 Energy and Chemical Reactions...

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1 Energy and Chemical Reactions Energy and Chemical Reactions Chapter 6 Chapter 6 James P. Joule 1818-1889. Discovered mechanical equivalent of heat, which led to the First Law of Thermodynamics. Germain Henri Hess 1802-1850. Hess’s Law.
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2 The Nature of Energy The Nature of Energy Kinetic energy is the energy of motion. Potential energy is energy which is available, such as an object that can fall a distance, potentially releasing kinetic energy when it hits the ground. Kinetic and Potential Energy Kinetic and Potential Energy
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3 The Nature of Energy The Nature of Energy We sometimes use the calorie instead of the joule: 1 cal = 4.184 J (exactly) A nutritional Calorie: 1 Cal = 1000 cal = 1 kcal 2 2 1 mv E k = (in J) Energy Units Energy Units SI Unit for energy is the joule, J: For example, energy of motion (kinetic energy):
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4 The Nature of Energy The Nature of Energy In chemistry, we’re interested in the internal energies of reactants and products and how it changes (ΔE) in going from: reactants products We usually can only measure ΔE, not E All objects and substances have an internal energy , E (this is a form of potential energy, and in this course is commonly called “chemical energy”). Δ ” means change in
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5 Energy cannot be created or destroyed. First Law of Thermodynamics First Law of Thermodynamics Total energy is conserved Total energy is conserved In chemistry, we are concerned with heat and chemical energy. The first law of thermodynamics tells us that the
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Ch06 MSJ jlm - Chapter 6 Energy and Chemical Reactions...

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