ANSWERS FINAL EXAM 3-21-08 FORM B

ANSWERS FINAL EXAM 3-21-08 FORM B - EXAM FORM B 1. The...

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1 EXAM FORM B 1. The electron in an H-atom begins in a 3p orbital and emits a photon as it moves to the 1s orbital. After it emits the photon it absorbs a photon and moves into the 3s orbital. Which of the following statements is true? A. The net value of the internal energy change for the two steps is + B. The net value of the internal energy change for the two steps is - C. The frequency of the absorbed light is equal to the frequency of the emitted light. D. The wavelength of the absorbed light is shorter than the wavelength of the emitted light. E. None of the above statements is true. 2. When light composed of photons with energy of 320 kJ/mol strikes the surface of Li (s), the electrons leaving the surface have a kinetic energy of 40 kJ/mol. How much energy is used to break the bonding of a Li atom to the surface of Li (s)? A. 360 kJ/mol B. Less than 200 kJ/mol C. 260 kJ/mol D. More than 360 kJ/mol E. None of the above 3. What is/are the identity of the reactive intermediates in the following reaction mechanism? F 2 2 F Fast equilibrium F + CO COF Fast equilibrium COF + F COF 2 Slow A. F only B. CO only C. COF and CO only D. COF 2 and F only E. COF and F only 4. The colors red, blue, yellow and green are all seen in a rainbow. Which of the following is the arrangement of these colors beginning with the longest wavelength and ending with the shortest wavelength? longest wavelength shortest wavelength A. red > green > yellow > blue B. green > blue > yellow > red C. red > yellow > green > blue D. blue > yellow > green > red E. blue > green > yellow > red
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2 5. One mole of a liquid is vaporized at constant temperature (91°C) and constant volume. 31.0 kJ of heat are absorbed when the liquid vaporizes. Which of the following statements is true ? A. Δ H = 31 kJ B. Δ H = -31 kJ C. E = 0 D. w = 0 E. None of the statements are true 6. A sample of N 2 O (g) is heated from 56° C to 169 o C at constant pressure of 5.00 atm. Which of the following statements about the process is false ? A. Δ H is positive B. Δ E is positive C. Work, w, is positive D. Heat, q, is positive E. Δ H is not equal to Δ E 7. The value of Δ H f o of HCN (g) is + 135 kJ/mol. Which of the following balanced equations represents a reaction whose heat change equals -135 kJ at constant pressure? A. H (g) + C (g) + N (g) HCN (g) B. HCN (g) H (g) + C (graph) + N (g) C. HCN (g) ½ H 2 (g) + C (graph) + ½ N 2 (g) D. H 2 (g) + 2 C (graph) + N 2 (g) 2 HCN (g) E. None of these 8. A balloon is filled with He at 25.0°C and 1.00 atm. The balloon is then placed in ice water and cooled to a temperature of 0 o C. The signs (+ or -) of Δ E, q, and w for the cooling process are: Δ E q w A + - + B + + + C - - - D + + - E - - +
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3 9. Which of the following atoms could include at least one electron with m l = -1 in its ground state configuration? A.
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ANSWERS FINAL EXAM 3-21-08 FORM B - EXAM FORM B 1. The...

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