CHEM 101 Fall 08 Exam II(a)

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1 CHEM 101 Fall 08 Exam II(a) On the answer sheet (scantron) write you name, student ID number, and recitation section number. Choose the best (most correct) answer for each question and enter it on your answer sheet. Potentially useful data: Avogadro s number: x Speed of light: c = 3.00 x 10 8 m/s Planck constant: h = 6.63 x J s E = hc/λ 1. Please choose the letter a as your answer for this question. 2. Which answer shows all possible values of the second quantum number, l, when the principal quantum number, n, equals 3? a. l = 0 b. l = 0, 1 c. l = 0, 1, 2 d. l = 0, 1, 2, 3 e. l = 0, 1, 2, 3, 4 3. How many electrons can the third principal quantum level hold? a. 2 b. 8 c. 16 d. 18 e What is the correct ground-state electron configuration for aluminum? a. 1s 2 2s 1 b. 1s 2 2s 2 2p 4 3s 2 3p 3 c. 1s 2 2s 2 2p 6 3s 2 3p 1 d. 1s 2 2s 2 2p 2 3s 2 3p 2 3d 2 4s 1 e. 1s 2 2s 2 2p 2 3s 2 3p 2 4s 2 5s 1 5. What is the correct shorthand notation for the ground-state electron configuration given? 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 a. [Ar]5s 2 b. [Ar]3s 2 3p 6 3d 10 4p 6 5s 2 c. [Ca]3d 10 4p 6 5s 2 d. [Kr]5s 2 e. [Rb]5s 1 6. What is the ground-state electron configuration of O 2-? a. 1s 2 2s 2 2p 5 b. 1s 2 2s 2 2p 6 c. 1s 2 2s 2 2p 4 d. 1s 2 2s 2 2p 2 e. 1s 2 2s 2 2p 3 Page 1 of 4

2 7. Which of the following statements is false? a. An excited state atom includes an extra electron relative to the ground state. b. No two electrons from a given atom can have the same four quantum numbers. c. Only two electrons can occupy an orbital. d. In general, when several orbitals of equal energy are available, electrons enter singly with parallel spins. e. In general, the most stable electronic structure of an atom has the maximum possible number of electron spins paired. 8. How many electrons does nitrogen have to gain to achieve a noble gas structure? a. 1 b. 2 c. 3 d. 4 e How many valence electrons does chlorine have? a. 1 b. 2 c. 5 d. 7 e Which of the following has the same electron configuration as Ar? a. K b. Ca 2+ c. Sc 2+ d. S - e. Cl Which element has an electron affinity greater than zero? a. Br b. I c. Te d. As e. Kr 12. Which of the following statements is true? a. The first ionization energy is always greater than the second ionization energy for a given element. b. Ionization energy generally increases with increasing atomic mass. c. Both first ionization energy and electron affinity generally decrease across a period. d. Ionization energy generally decreases down a group and increases across a period. e. Ionization energy generally increases down a group and decreases across a period. Page 2 of 4

3 13. Which of these elements has the largest first ionization energy? a. Be b. Mg c. Ca d. Sr e. Ba 14. Which of the following processes release energy to the surroundings? a. Removing an electron from a neutral atom b. Separating a sodium ion (Na + ) from a chloride ion (Cl - ) c. Removing an electron from a positively charged ion d. Elevation of an electron from a lower energy level to a higher energy level within the same neutral atom e. Adding an electron to a neutral halogen atom 15. A 100-g piece of metal initially at T = 75 o C is submerged in 100 g of water initially at T = 25 o C. The specific heat capacity of iron is 0.45 J g -1 C -1 and the specific heat capacity of water is 4.18 J g -1 C -1. What is the final temperature of both substances in o C? a. 100 b. 75 c. 65 d. 30 e The temperature of a 21.6 g sample of a metal rises 6.04 C when 60.0 J of energy is applied to it. What is the identity of the metal? a. silver (specific heat = J g -1 C -1 ) b. copper (specific heat = J g -1 C -1 ) c. iron (specific heat = J g -1 C -1 ) d. lead (specific heat = J g -1 C -1 ) e. aluminum (specific heat = J g -1 C -1 ) 17. What is the molar heat capacity of table salt, NaCl (specific heat = 0.88 J g -1 C -1 )? a J mol -1 C -1 b J mol -1 C -1 c J mol -1 C -1 d. 117 J mol -1 C -1 e. 245 J mol -1 C Which process is exothermic from the system s point of view? The system undergoing the process is shown in parentheses. a. the solidification of wax (wax) b. the evaporation of alcohol (alcohol) c. the defrosting of frozen food (food) d. the heating of milk (milk) e. the melting of tin (tin) Page 3 of 4

4 19. What is the enthalpy change when 175 g of C 3 H 8 are burned in excess O 2? C 3 H 8 (g) + 5 O 2 (g) 3 CO 2 (g) + 4 H 2 O(l) H = kj a kj b kj c kj d kj e kj 20. Which of the following statements is false? a. Breaking bonds is always endothermic. b. Bond enthalpies quantify the energy change for the complete separation of two bonded atoms in a molecule at constant pressure. c. Bond enthalpy values are based on molecules in the gas phase. d. Breaking weak bonds and making an equal number of strong bonds is exothermic. e. Breaking weak bonds and making a greater number of equally weak bonds is endothermic. 21. Choose the appropriate pair of words in the proper order to put in the following statement: In an endothermic reaction, heat is transferred from the to the. a. gases, liquids b. solids, liquids c. products, reactants d. system, surroundings e. surroundings, system 22. Which pair of terms, in order, makes the following statement correct? For the physical change of liquid to gas at atmospheric pressure and 100 C, the temperature and heat is transferred the system. a. increases, into b. increases, out of c. stays the same, out of d. stays the same, into e. decreases, out of Page 4 of 4

5 chem101exam2a Answer Section SHORT ANSWER 1. ANS: A PTS: 0 MULTIPLE CHOICE 2. ANS: C PTS: 1 3. ANS: D PTS: 1 4. ANS: C PTS: 1 5. ANS: D PTS: 1 6. ANS: B PTS: 1 7. ANS: A PTS: 1 8. ANS: C PTS: 1 9. ANS: D PTS: ANS: B PTS: ANS: E PTS: ANS: D PTS: ANS: A PTS: ANS: E PTS: ANS: D PTS: ANS: C PTS: ANS: C PTS: ANS: A PTS: ANS: E PTS: ANS: E PTS: ANS: E PTS: ANS: D PTS: 1 Page 5 of 4

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