17 Thermochemistry & Enthalpy

17 Thermochemistry & Enthalpy - What is energy? A....

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1 What is energy? A. A mysterious thing that no one really understands. B. A fundamental component of the universe. C. A way to keep track of the ability to do work. D. Both (B) and (C) E. 2 What is energy? A) “a mysterious thing that no one understands” Richard Feynman, Lectures on Physics , Vol. 1, p. 4-1. B) a fundamental component of the universe Einstein E = mc 2 (Mass can be converted to energy.) But m = E/c 2 (Says mass comes from energy! C) keeps track of the ability to do work Energy, E  Work, W
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3 Units of Energy Joule 1 J = 1 kg m 2 /s 2 KE = ½ mv 2 so 1 kg object moving at a velocity of 1 m/s has 1 J of kinetic energy. calorie 1 cal is the amount of energy it takes to raise the temperature of gram of water by 1 o C. 1 cal = 4.184 J Calorie (nutritional calorie) 1 Cal = 1000 cal = 1 kcal used to measure energy in foods 1 Cal = 4.184 kJ 4 What is meant by temperature? Temperature is a measure of the ability of a system to transfer energy to another system. At 0 K, a system is in its lowest energy state, and
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17 Thermochemistry & Enthalpy - What is energy? A....

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