Chem 2B-quiz 1-011207

Chem 2B-quiz 1-011207 - surroundings. Open Systems heat,...

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Chem 2B, Winter 2007 Professor Thuc-Quyen Nguyen Quiz #1 01/12/07 1) ( 4 points ) State the first law of thermodynamics. The principle of conservation of energy (energy can neither be create nor destroyed). If a system undergoes a process by heat and work transfer, then the net heat supplied q , plus the net work output w , is equal to the intrinsic energy of the working system. 2) ( 4 points ) What is thermal energy? It could be either regarded as a synonym for heat or internal energy. Internal energy of a system in thermodynamic equilibrium by virtue of its temperature. A hot body has more thermal energy than a similar cold body, but a large tub of cold water may have more thermal energy than a cup of boiling water. Thermal energy can be transferred from one body, usually hotter, to a second body, usually colder, in three ways: conduction, convection, and radiation. 3) ( 6 points ) Name three types of systems existed and describe the differences between them. Closed Systems – matter does not cross the boundary between the system and its
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Unformatted text preview: surroundings. Open Systems heat, work, and matter may cross the boundary between the system and its surroundings. Isolated Systems matter and energy does not cross the boundary between the system and its surroundings. Adiabatic Systems heat does not cross the boundary between the system and its surroundings. Diathermic Systems - heat may cross boundary between the system and its surroundings. 4) ( 6 points ) What are state functions? Give four properties of a system that are state functions. The value of a state function depends only on the current state of the system and it is independent of how that state has been processed. In other words it is a function of the properties that determine the current state of the system. Internal energy, enthalpy, entropy, pressure, temperature, volume, heat capacity are some example for state functions....
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This note was uploaded on 08/06/2008 for the course CHEM 2B taught by Professor Nguyen during the Winter '07 term at UCSB.

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