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121Exam2 - Dr Grandinetti Chemistry 121 Monday Spring...

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Unformatted text preview: Dr. Grandinetti Chemistry 121 Monday Spring Quarter 2007 May 14, 2007 SECOND MIDTERM EXAM 6:30 - 7:48 PM Name Lab. Instructor Signature Rec. Instructor INSTRUCTIONS 1. Fill out answer sheet as follows, using pencil only. (Ink will not record). a) Print your last name, starting at the far left, FILL IN THE CORRESPONDING LETTER UNDER EACH LETTER IN YOUR LAST NAME. b) Leaving one space after the last name, print your first name and FILL IN THE CORRESPONDING LETTER UNDER EACH LETTER IN YOUR FIRST NAME. 0) MI means "middle initial”. Leave one space after your first name, print your middle initial, FILL IN THE CORRESPONDING LETTER UNDER YOUR MIDDLE INITIAL. d) Place your signature on the line above your printed name. e) You MUST indicate your two—digit section number. 1. Locate your LAB day/time FIRST, 2. Find your TA'S NAME, 3. Fill in the TWO-DIGIT NUMBER for your section on the answer sheet starting in COLUMN "K" in the SPECIAL CODES SECTION. f) Fill in the IDENTIFICATION NUMBER starting in COLUMN A with your Carmen ID Number. g) DO NOT fill in sex or birth date. Find lab day/time, then T. A. and enter two di_it section number. Monday 8: 30 Frida 8. 30 Kamakshi Singh James Lu Bryan Sears Brenda Wray Ashley Katana Annie Agin Yucheng Pang Yuning Chang Yuchen ; Pang 2. When the proctor gives the signal, but not before, check to see that there are 6 numbered pages, and a Periodic Table. 3. There are 25 multiple choice questions for a total score of 175 points. 4. You must mark answers on the answer sheet in PENCIL. Fill in all answers COMPLETELY with PENCIL. If you wish to change an answer, erase the unwanted mark COMPLETELY. 5. Use the blank page for scratch work, but note that only the marks you make on the answer sheet will be observed by the grading equipment. 6. The time allowed is 1 hour, 18 minutes. 7. At the end of the examination, you must hand in the ANSWER SHEET before leaving the room Grandinetti Chem 121 Midterm 2 1. Calculate the kinetic energy in joules of an 80.0 g bullet traveling at 300.0 m/s. A) 3.60x106 Bi 1.20x104 D) 12.0 E) 80.0 2. The change in the internal energy of a system that releases 2,500 J of heat and that does 7,655 I of work on the surroundings is J. B) 5155 C) —1.91 x 107 D) 10,155 E) 5,155 3. The value of AH° for the reaction below is -1107 Id: 2Ba (s) + 02 (g) —> 2BaO (s) HOW many k] of heat are released when 5.75 g of Ba (3) reacts completely with oxygen to form BaO (s)? A) 96.3 B) 26.3 Ci 46.4 E) 193 4. The AH for the solution process when solid sodium hydroxide dissolves in water is 44.4 kJ/mol. When a 13.9—g sample ofNaOH dissolves in 250.0 g ofwater in a coffee- cup calorimeter, the temperature increases from 23.0 °C to °C. Assume that the solution has the same specific heat as liquid water, i.e., 4.18 J/g-K. A) 35.2 °C B) 24.0 °C C) 37.8 °C E) 40.2 °C 5. Given the following reactions CaC03 (s) —> CaO (s) + C02 (g) AH = 178.1 kJ c (s, graphite) + 02 (g) —> cog (g) AH = 393.5 kJ the enthalpy of the reaction CaC03 (s) —> Ca0 (s) + C (s, graphite) + 02 (g) is U. Ai 215.4 C) 2154 D) —571.6 E) 7.01 x 104 6. The value of AH° for the following reaction is —3551 k]: 2A1 (s) + 302 (g) —> 2A12O3 (s) The value of AHf° for A1203 (s) is kJ. A -3351 B) -l676 C) -32.86 D) —16.43 E) +3351 7. Given the data in the table below, AH°rxn for the reaction 803 (g) + H20 (1) —> H2304 (l) is M. Substance AHf° (kJ/mol) 802 (g) -297 503 (g) '396 $02C12 (g) -364 H2804 (1) -814 H20 (1) -286 B) 1496 C) 704 D) —704 E) —2.16x 103 8. When a system , AB is always negative. A) absorbs heat and does work ‘5) gives off heat and does work C) absorbs eat ano has work done on it D) gives off heat and has work done on it E) none of the above is always negative 9. Which of the following statements is true? A) Enthalpy is an intensive property. B) The enthalpy change for a reaction is independent of the state of the reactants and oroduc C Enthalpy is a state function. D) H is the value of q measured under conditions of constant volume. E) The enthalpy change of a reaction is the reciprocal of the AH of the reverse reaction. 10. For which one of the following reactions is the value of AH°rxn equal to AH°f for the product? A) H2 (g) + 1/2 02 (g) —> H20 (1) B) H2 (g) + 02 (g) —> H202 (1) C) 2 C (s, graphite) + 2 H2 (g) —> C2H4 (g) D) 1/2 N z + 02 (g) —> N02 (g) ) all ofthe above ll. The energy of a photon that has a wavelength of 12.3 nm is J. A) 1.51 x 10'17 B) 4.42x 10‘23 C) 1.99x10‘25 Di iii . lO—SO 12. What color of visible light has the highest energy? B) blue C) red D) green E) yellow 13. When the electron in a hydrogen atom moves from n = 6 to n = 2, light with a wavelength of nm is emitted. A) 93.8 B) 434 C) 487 D 657 14. What is the de Broglie wavelength (m) of a 25 g object moving at a speed of 5.0 m/s? Ai 1.9)(1032 C) 6.6x 10'36 D) 3.32x 10'36 E) 3.02x 1045 15. The principal quantum number of the first d subshell is A) 1 B) 2 D) 4 E) 0 16. [Ar]4s23d104p3 is the electron configuration of a(n) atom. B) V C) P D) Sb E) Sn 17. Which one of the following represents an acceptable set of quantum numbers for an electron in an atom? (arranged as n, l, m), and ms) A) 2, 2,—1,—1/2 C) 3, 3,3, 1/2 D) 5, 4, —5, 1/2 E) 3,3, 34/2 18. The complete electron configuration of gallium, element 31, is A 1s22s22..103s23‘°4s23d3 B 1s22s22p63s23p63d‘04s24.‘ C) ls2s2p3s3p 433d D) 1s42s42p‘03s43p9 E) ls42s42p83s43p84s3 19. In general, as you go across a period in the periodic table from left to right: (1) the atom radius—__; (2) the electron affinity becomes _— negative; and (3) the first ionization energy A) decreases, decreasingly, increases B) increases, increasingly, decreases C) increases, increasingly, increases I decreases, increasingly, increases E) decreases, 1ncreas1ng y, ecreases 20. The substance, is always produced when an active metal reacts with water. A) NaOH B) H20 0 E) 02 21. Which one of the following elements has the largest atomic radius? A)o B)F D)P E) B 22. Of the following elements, which has the largest @ ionization energy? A)K B) Rb C r E) Ba 23. Which of the following has the largest second ionization energy? A) Si B) Mg C) Al E)P 24. Which equation correctly represents the electron affinity of calcium? A) Ca (5’) + 6' —> Ca" (g) B) Ca (g) —> Ca (g) + e' C) Ca (g) —> Ca" (g) + e' D) Ca' (g) -+ Ca (5’) + 6' E) Ca+ (g) + e' —> Ca (g) 25. Of the following, radiation has the shortest wavelength. B) radio C) microwave D) ultraviolet E) infrared mo Abba a N w .wm NS 3.3 CNS 3“qu NNWON wwobm >23.an DEMON” bu Iv >835 2539. WE Iv 52:2: @562 Sub” Iv “No—mag £0an Sam? A833 <w <5 <Ew S E m Nu In 8.9.. $00 . 3 AN Sbm 3.3 3 E 3.3 gm d mm Hm :mhm. Sobm . m m N» .H 3 . E 3 29 3PM.“ on d. Brow gm ‘3 << Wm O :3 mm 50.2 Gob <5 w a" ma :98 3 W: ENE Sm. x2: 5 mm m5 393 “gram www.9— Mwu.o.a Humbw numb» mfibo :o 2.: .95 Ga: Hm : 80m 33% E i :N ~ 95 HEN» G H<> <> 3 5.3 _ 82% G wobq mw w mombm mmbu w . 3QO So 3; . Noobo .8.me ...
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