final - – Final – mccord –(51600 1 This print-out...

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Unformatted text preview: – Final – mccord – (51600) 1 This print-out should have 53 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 1.0 points The electronegativity of nonmetals is rela- tively (high, low, the same) as compared to metals. 1. high 2. the same 3. low Explanation: Both electronegativity and nonmetallic character increase from left to right and from bottom to top of the Periodic Table. 002 (part 1 of 2) 1.0 points The following is the plot of vapor pressure vs temperature for three substances, A, B, and C. A B C 100 300 500 700 900 1100- 25 25 50 75 temperature ( ◦ C) pressure(torr) Which, if any, of these substances would be a gas at SATP? 1. A 2. all 3 are gases 3. B and C 4. none 5. A and B 6. B 7. A and C 8. C Explanation: Only substance A has a vapor pressure greater than 1 bar (750 torr) at 25 ◦ C. 003 (part 2 of 2) 1.0 points Which ones are gases at STP? 1. C 2. A and C 3. all 3 are gases 4. A 5. B 6. none 7. B and C 8. A and B Explanation: At 0 ◦ C all the substances have vapor pres- sures below 760 torr and are therefore liquids. None are gases at STP. 004 2.0 points A gas is isothermally expanded. Which plot best shows this type of expansion? 1. V P 2. V P 3. V P-`¡Ìi`ÊÜ¡Ì¢ÊÌ¢iÊ`i£¤ÊÛiÀᤥʤvÊ 6¡v¢ÝÊ*À£Ê*,3Ê-`¢Ì£À Ê /¤ÊÀi£¤ÛiÊÌ¢¡ÃÊ¥¤Ì¡Vi]ÊۡáÌ\Ê ÜÜÜ°¡Vi¥¡°V¤£ÉÕ¥¦¤V§°¢Ì£ – Final – mccord – (51600) 2 4. V P 5. V P Explanation: The proper graph shows that P is inversely proportional to V . 005 2.0 points What volume will 15 L of He at 53 ◦ C and 1297 torr occupy at STP? 1. 15.0 L 2. 0.0327 L 3. 0.0466 L 4. 8.79 L 5. 30.6 L 6. 21.4 L Explanation: P 1 = 1297 torr P 2 = 760 torr V 1 = 15 L T 2 = 273.15 K T 1 = 53 ◦ C + 273.15 = 326 . 15 K Using the Combined Gas Law, P 1 V 1 T 1 = P 2 V 2 T 2 V 2 = P 1 V 1 T 2 T 1 P 2 and recalling that STP implies standard tem- perature (273.15 K) and pressure (1 atm or 760 torr), we have V 2 = (1297 torr) (15 L) (273 . 15 K) (326 . 15 K) (760 torr) = 21 . 4388 L 006 2.0 points In a system at equilibrium at constant tem- perature and pressure, Δ H is necessarily equal to 1. P Δ V. 2. T Δ S. 3. Δ U. 4. Δ G. 5. 0. Explanation: Δ G = 0 for a system at equilibrium, so Δ G = Δ H- T Δ S = Δ H- T Δ S Δ H = T Δ S 007 2.0 points The definition of internal energy is Δ U = q + w . Which of these three values are state func- tions? 1. Δ U , but only at constant volume 2. q and w , but only at constant volume 3. Δ U , q , and w 4. Δ U only 5. q and w only Explanation: 008 2.0 points What volume is occupied by 500 g of fluorine gas at 5.00 ◦ C at a pressure of 735 Torr?...
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final - – Final – mccord –(51600 1 This print-out...

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