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Notes - Section 5.1-5.4

Notes - Section 5.1-5.4 - Paul Jackman October 8 2009...

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Paul Jackman October 8, 2009 Chemistry CHE 106 – M029 Section 5.1-5.4 Notes CHAPTER 5 THERMOCHEMISTRY Energy changes invariably accompany chemical reactions We also use a chemical reaction specifically to obtain energy (burning fuels) The study of energy and its transformations is known as thermodynamics Thermochemistry is the relationship between chemical reactions and energy changes 5.1 The Nature of Energy Energy is commonly defined as the capacity to do work or to transfer heat o Work is the energy used to cause an object with mass to move against a force o Heat is the energy used to cause the temperature or an object to increase Kinetic Energy and Potential Energy Kinetic energy- the energy of motion The magnitude of the kinetic energy, E k , of an object depends on its mass, m, and speed, v E k = ½ mv 2 Potential energy possessed by an object by virtue of its position relative to other objects A force is any kind of push or pull exerted on an object One of the most important forms of potential energy in chemistry is electrostatic potential energy, which arises from the interactions between charged particles.
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