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Unformatted text preview: Version 001 – quiz 7 – sparks – (50990) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Msci 15 0505 001 10.0 points For a reaction in which gases are neither pro- duced nor consumed, Δ H is 1. unrelated to Δ E . 2. greater than Δ E . 3. the same as Δ E . correct 4. less than Δ E . Explanation: For a reaction at constant temperature and constant pressure, Δ E = Δ H- (Δ n ) RT . If gases are neither produced nor consumed, Δ n will be zero, so Δ E must equal Δ H . LDE Sign Conventions 001 002 10.0 points In the formula Δ U = q + w , work done by the system during expansion is (nega- tive/positive), and heat (gained/lost) by the system is positive. 1. negative, gained correct 2. negative, lost 3. positive, lost 4. positive, gained Explanation: The sign conventions for process functions (like work and heat) are such that a positive sign is attributed to the system if it gains...
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This note was uploaded on 11/05/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.
- Fall '07