exam2-F00 - Chemistry 12 FORM A-1 An AM radio station in...

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Unformatted text preview: Chemistry 12 10/18/00 FORM A ------------------------------------------------------------------------------------------------------1. An AM radio station in New York broadcasts electromagnetic radiation at a frequency of 1204 kHz (1 kilohertz =1000 Hz). What is the wavelength of these radio waves expressed in meters? A. B. C. D. E. 250 × 10 3 m 400 m 249 m 4.00 × 10−6 m 340 m ------------------------------------------------------------------------------------------------------2. Chlorine is much more apt to exist as an anion than is sodium. This is because: A. B. C. D. E. chlorine is bigger than sodium. chlorine has a greater ionization energy than sodium does. chlorine has a greater electron affinity than sodium does. chlorine is a gas and sodium is a solid. chlorine is more metallic than sodium. ------------------------------------------------------------------------------------------------------3. Which equation correctly represents the first ionization of aluminum? Al−(g) → Al(g) + e− Al(g) → Al−(g) + e− Al(g) + e− → Al−(g) Al(g) → Al+(g) + e− Al+(g) + e− → Al(g) A B C D E ------------------------------------------------------------------------------------------------------4. Which one of the following atoms has the largest radius? A. B. C. D. E. O F S Cl Ne ------------------------------------------------------------------------------------------------------- 1 2 5. In which group of elements would all members be expected to have very similar chemical properties? A. B. C. D. E. O, S, Se N, O, F Na, Mg, K S, Se, Si Ne, Na, Mg 9. Which of the following relationships in atomic and ionic sizes is/are correct? 1. Cl− > Cl > Cl+ 2. K+ > Na+ > Li+ 3. Fe3+ > Fe2+ > Fe ------------------------------------------------------------------------------------------------------6. How many valence electrons are in the Lewis structure of ClO4−? A. Only 2 is correct. B. Only 3 is correct. C. Both 1 and 2 are correct. D. Both 2 and 3 are correct. E. All three are correct. ------------------------------------------------------------------------------------------------------- A. B. C. D. E. 31 32 33 34 35 10. Which of the following sets of species is/are isoelectronic? 1. S2−, Cl−, K+ 2. Na+, Mg2+, Al3+ ------------------------------------------------------------------------------------------------------7. Which one of the following is the electron configuration for the Fe+2 ion? A. B. C. D. E. [Ar] 3d6 [Ar] 4s2 3d4 [Ar] 3d8 [Ar] 4s2 3d8 [Ar] 4s2 3d6 3. Na+, K+, Li+ A. 1 only B. 2 only C. 1 and 2 only D. 1 and 3 only E. 1 and 2 and 3 ------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------8. MgO has a higher melting point than KCl. Which of the following reasons support this fact? 1. MgO has a smaller lattice energy than KCl, and therefore it melts at a higher temperature. 2. The magnesium ion is larger than the potassium ion, and therefore the lattice energy of MgO is higher. 3. Magnesium ion has a larger charge than the potassium ion, and therefore the lattice energy of MgO is higher. A. Only 1 is correct. B. Only 2 is correct. C. Only 3 is correct. D. Both 2 and 3 are correct. E. None of these are correct. 11. The best Lewis electron-dot structure for the molecule HCN (H bonded to C) has A. 1 nonbonding pair (lone pair) on C B. 1 nonbonding pair (lone pair) on N C. 1 nonbonding pair (lone pair) on H D. 2 nonbonding pairs (lone pairs) on N E. 2 nonbonding pairs (lone pairs) on C ------------------------------------------------------------------------------------------------------12. The correct Lewis structure for the BrO3− ion (Br is at the center) has: A. 25 valence electrons B. one multiple bond C. one atom lacking a complete octet D. 9 lone pairs E. one lone pair on the Br atom ------------------------------------------------------------------------------------------------------- 3 ------------------------------------------------------------------------------------------------------- 4 13. Some chefs keep baking soda handy to put out grease fires. Calculate the ∆Horxn for the decomposition of baking soda, which helps to smother the flames. 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(l) o ∆H f (NaHCO3(s)) = − 947 kJ/mol ∆Hof (Na2CO3(s)) = −1131 kJ/mol ∆Hof (H2O(!)) = − 285.9 kJ/mol ∆Hof (CO2(g)) = − 393.5 kJ/mol A. – 1810 kJ B. + 84 kJ C. + 1895 kJ D. – 90 kJ E. None of the above are within 10% of the correct answer. ------------------------------------------------------------------------------------------------------14. Calculate the molar heat capacity of iron in J mol−1 oC−1. Its specific heat is 0.4498 J g−1 oC−1 A. 25.1 B. − 26.0 C. 251. D. 124. E. None of the above are within 10% of the correct answer. 16. The lines in the visible portion of the hydrogen spectrum (Balmer series) have n1 = 2 in the Bohr equation. Calculate the wavelength in nm of the spectral line in this series for which n2 = 4. A. B. C. D. E. 0.480 206 486 972 0.5 ------------------------------------------------------------------------------------------------------17. Which one of the following does not have a 4s1 electron configuration in its outermost shell? A. Mn+ B. Fe C. Cr D. K E. Cu ------------------------------------------------------------------------------------------------------18. Which of the following best describes the ground state valence electron arrangement in Mn ? A. ------------------------------------------------------------------------------------------------------- B. 15. A container filled with 2.46 kg of water underwent a temperature change due to combustion of methane from 25.24 oC to 27.31 oC. If the water is considered the system, what was the energy change of the surroundings? The specific heat of water is 4.184 J g−1 oC−1. C. A. – 21.3 kJ B. 19.4 kJ C. 21,300 J D. − 0.213 kJ E. 420. J D. E. ------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------- 5 6 19. Which of the following are NOT correct ground state electron configurations? 1 5 1. [Ar]4s 3d 2. 1s22s22p33s1 3. [Ne]3s23p3 4. [Ar]4s23d7 5. 1s22s23p6 A. B. C. D. E. Shells A. B. C. D. E. 2 and 4 1 and 5 2 and 5 1, 2, and 5 3 and 4 Subshells Orbitals Unpaired Electrons 4 4 4 4 4 7 7 8 8 8 17 18 17 18 18 1 1 0 1 0 ------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------20. How many unpaired electrons are there in the ground state electron configuration of Cl? A. B. C. D. E. 23. In the ground state electronic configuration of Br, how many total shells, subshells and orbitals contain at least one electron, and how many unpaired electrons are present? 0 1 3 4 5 24. Which of the following is the correct electronic configuration for As in the ground state with orbitals listed in order of increasing energy? A. B. C. D. E. 1s22s22p63s23d103p64s24d104p3 1s22s22p63s23d103p64s24p3 1s22s22p63s23d103p64s24d104p4 1s22s22p63s23p64s24d104p3 1s22s22p63s23p64s23d104p3 ------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------- 25. Which of the following statements describes the following process: [Ne]3s23p1 → [Ne]3s24d1 21. How many electrons can have the quantum numbers n = 2, l = 1, and ms = +1/2? A. B. C. D. E. 1 3 5 6 10 I. Energy is released. II. A photon is emitted. III. An electron is promoted from the ground state to the excited state. IV. Energy is absorbed. ------------------------------------------------------------------------------------------------------22. What is the energy of one mole of photons of green light of λ = 500 nm? A. B. C. D. E. 3.98 x 10−19J 2.39 x 10−4J 239 kJ 2.39 x 10−13J None of the above answers is within ± 10% of the correct answer A. I only B. III only C. I and II only D. II and IV only E. III and IV only --------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------------------------- 7 8 26. Ethanol (grain alcohol) is formed industrially by the reaction of water with ethylene. Calculate the ∆Horxn for this reaction (kJ/mol). C2H4(g) + H2O (l) → C2H5OH (l) given the following thermochemical equations C2H4(g) + 3 O2(g) → 2 CO2(g) + 2 H2O (l) ∆H = −1411.1 kJ C2H5OH(l) + 3 O2(g) → 2CO2(g) + 3H2O (l) ∆H = −241.8 kJ A. B. C. D. E. −1,652.9 kJ/mol +1,652.9 kJ/mol −825.0 kJ/mol −1,169.3 kJ/mol +1,169.3 kJ/mol ------------------------------------------------------------------------------------------------------27. Which of the following statements about p orbitals is correct? A. l = 0 and shape = spherical B. l = 1 and shape = spherical C. l = 0 and shape = dumbbell D. l = 1 and shape = dumbbell E. l = 2 and shape = dumbbell ------------------------------------------------------------------------------------------------------- 9 10 Form A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 C C D (1/2 for E) C A B A C C C B E B A A (1/2 for C) C B D C (1/2 for D) B B C D E E (1/2 for B) D D 11 ...
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