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Chapter 6.1 - 6.5

CHEM 1050 Chapter Notes - Chapter 6.1 - 6.5: Contact Energy, Stoichiometry, Enthalpy


Department
Chemistry
Course Code
CHEM 1050
Professor
Lori Jones
Chapter
6.1 - 6.5

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Thermochemistry Textbook Notes
6.1 Energy and Its Units
Energy is the potential or capacity to move matter. Energy is not a material thing but rather a
property of matter
KINETIC ENERGY; UNITS OF ENERGY
Kinetic energy is the energy associated with an object by virtue of its motion
Ek=1/2MV^2
The SI unit of energy is given the name joule (J)
the calorie (cal) is a non-SI unit of energy commonly used by chemists, originally defined as
the amount of energy required to raise the temperature of one gram of water by one degree
celsius (1cal = 4.184 J)
POTENTIAL ENERGY
Potential energy is the energy an object has by virtue of its position in a field of force
Ep=mgh
As water falls, it moves more quickly, the potential energy decreases and the kinetic energy
increases
INTERNAL ENERGY
The sum of the kinetic and potential energies of the particles making up the substance is
referred to as the internal energy (U) of the substance
The total energy of a quantity of water equals the sum of its kinetic and potential energies as a
whole (Ek+Ep) plus its internal energy
Etot = Ek + Ep + U
Normally when you study a substance in a lab it is at rest at a vessel so its kinetic energy is 0,
its potential energy is constant and you can take to be 0, so the total energy of the substance
equals its internal energy (U)
LAW OF CONSERVATION OF ENERGY
Law of conservation of energy: energy may be converted from one form to another, but the
total quantity of energy remains constant
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