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Lecture

CHEM 1310 Lecture Notes - Kinetic Energy, Gas Cylinder, Calorie


Department
Chemistry
Course Code
CHEM 1310
Professor
Sarrah Vakili

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Thermochemistry
Transfer of energy from one place to another, usually in the from of heat
o Multiple types of energy - can change from one type to another
o Studied quantitatively - with numbers
Definition from physics - ability to do some type of work where work is moving and object against
force
o Measured in joules (J)
Kinetic energy - energy of moving objects
o Ex:
Radiant - like light
Thermal - like heat
o Temperature is not thermal energy
o Temperature is directly proportional to thermal energy
Ekinetic = (1/2)(mass)(velocity)2 = Joules
Eaverage = 
        
Na - Avogadro's number
Potential Energy
Energy that is stoned in position, composition, intermolecular forces, or conditions
o Ex: tire at top of a hill
o Ex: chemical (bonds), mass (E = mc2), electrical (E= 
Law of Conservation of Energy
First law of thermodynamics
Energy is neither created or destroyed
Energy may be transferred (moves from 1 place or thing to another) or transformed (energy
change from one type to another)
Terminology
Surroundings - an area that is not the system
o The area outside of where you are studying (outside of the system)
System - an area chosen to study
o The area, substance, or compound that you are studying
o 3 types:
Open system - free exchange of energy and matter between the systems and the
surroundings
Ex: a bowl of soup
Closed system - exchange of energy, but not matter, between the system and the
surroundings
Ex: stopped flask, drink with a lid
Isolated system - no exchange of energy or matter between the system and the
surroundings
Ex: gas cylinder, thermos of food
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