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Unformatted text preview: Chem 130A EXAM#1 2/16/05 Prof. Jay Groves Write solutions clearly on separate pages. 1. Answer true or false and provide your reason in 10 words or less. a. For any change of state, the sum of w + q is path independent. (5pt) TRUE: w + q = ! U and U is a state variable hence path independent b. For any change of state, ! S is path independent. (5pt) TRUE: since S is a state variable ! S is path independent c. If heat is exchanged between a system and its surroundings at constant temperature during a reversible process, then ! S for the universe = 0. (5pt) TRUE: ! S universe = 0 for all reversible processes (by definition of a reversible process) ! S universe = (q rev /T) sys + (-q rev /T) surr T sys = T surr d. For an irreversible expansion of a gas against a low external pressure (e.g. P ex < P int ), the magnitude of the irreversible work must be greater than the work done for the same state change on a reversible path: |w irr | > |w rev |. (5pt) FALSE: w irrev = ! P ext dV = P ext " V v i v f # (last expression for ideal gas) w rev = ! P int dV = v i v f " ! nRT ln V f V i (last expression for ideal gas) even when not considering ideal gas;...
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This note was uploaded on 02/17/2010 for the course BIOE 100 taught by Professor Budinger during the Spring '10 term at Berkeley.
- Spring '10