chapter6 - Chapter 6: Thermochemisty 6.1 The Nature of...

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Chapter 6: Thermochemisty 6.1 The Nature of Energy * energy (E) : the capacity to do work or produce heat. It can be classified as either potential or kinetic energy. - potential energy : energy due to position or composition. - attractive and repulsive forces can also lead to potential energy - kinetic energy : the energy of an object due to its motion. KE = ½mv² - m is the mass, v is the velocity * Energy can be converted from one form to another. (Potential energy is converted into kinetic energy and vice versa.) - frictional heating : kinetic energy transferred into an object’s surroundings as heat * the Law of Conservation of Energy : states that energy can be converted from one form to another but can be neither created nor destroyed. * heat: involves the transfer of energy between two objects because of temperature difference * work: force acting over a distance * pathway: the way energy transfer is divided between work and heat depending on specific conditions. * state function/state property - refers to a property of the system that depends only on its present state. * system - the part of the universe being focused on * surroundings - everything else in the universe * exothermic - when a reaction results in the evolution of heat, that is, where energy flows out of the system. - In any exothermic reaction, some of the potential energy stored in the chemical
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chapter6 - Chapter 6: Thermochemisty 6.1 The Nature of...

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