CHM-101-Chapter-06 - Chapter 6 Thermochemistry Mohammad...

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Chapter 6 Thermochemistry Mohammad Al-Sayah, Ph.D.
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Overview Thermochemistry : treats of the relations of heat and chemical changes Converting energy from one form to another in any system is governed by the same principles
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6.1 The Nature of Energy Energy is the capacity to do work or to produce heat. Law of conservation of energy: Energy can be neither created nor destroyed Energy can be converted from one form to another Energy of the universe is constant
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6.1 The Nature of Energy Potential Energy is the energy due to position or composition Kinetic Energy is the energy due to the motion of the object and depends on its mass KE = (1/2) mv 2
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6.1 The Nature of Energy Temperature is the property that reflects the random motions of the particles in a substance Heat involves the transfer of energy between two objects with different temperatures Work is defined as force acting over a distance
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6.1 The Nature of Energy Energy is transferred by two ways: work ( w ) and heat ( q ) E = q + w The way that energy transferred is divided between work and heat depending on the pathway The total energy transferred will be constant
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6.1 The Nature of Energy A state function refers to property of the systems that depends only on its present state It is independent of the pathway Energy is a state function but work and heat are NOT state functions
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6.1 Chemical Energy
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CHM-101-Chapter-06 - Chapter 6 Thermochemistry Mohammad...

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