121Exam1 - Dr. Grandinetti Chemistry 121 Monday Spring...

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Unformatted text preview: Dr. Grandinetti Chemistry 121 Monday Spring Quarter 2007 April 23, 2007 FIRST 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. (1) 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. D 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 TA. and enter two di it section number. Monday 8:30 Friday 8:30 Kamakshi Singh 24 James Lu 28 Bryan Sears 25 Brenda Wray 29 Ashley Katana 26 Annie Agin 30 Yucheng Pang 27 Yuning Chang 31 Yucheng Pang 32 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 #1 1. A combination of sand, salt, and water is an example of a A) homogeneous mixture C) compound D) pure substance E) solid 2. Which of the following are chemical processes? 1. rusting of a nail 2. freezing of water 3. decomposition of water into hydrogen and oxygen gases 4. compression of oxygen gases 13> w “mm )2, ,4 1 4 U P—‘H ht.) ) ) 3. A wooden object has a mass of 10.782 g and occupies a volume of 13.72 mL. What is the density of the object determined to an appropriate number of significant figures? 3 [T1 9 A) 8x 10'1 mL B) 7.9x 10' g/mL C) 7.86 x 10'1 g/mL D) 7.859 x10' g/mL E) 7.8586 10' g/mL 4. The width, length, and height of a large, custom—made shipping crate are 1.22 m, 3.22 m, and 0.83 m, respectively. The volume of the box using the correct number of significant figures is m3. A) 3.26057 C) 3.26 D) 3.261 E) 3.2606 5. The name of the binary compound N204 is A) nitrogen oxide B) nitrous oxide C) nitroen III oxide D) dinitrogen tetroxide E) oxygen nitride 6. Vanadium has two naturally occurring isotopes, 50V with an atomic mass of 49.9472 amu and 51V with an atomic mass of 50.9440. The atomic weight of vanadium is 50.9415. The percent abundance of the vanadium isotopes are % 50V and % 51V. A 0.2500, 99.750 B) 99.750, 0.2500 C) 49.00, 51.00 D) 1.000, 99.000 E) 99.000, 1.000 7. Which formula/name pair is incorrect? A) FeSO4 iron(II) sulfate B) F e2(803)3 ir0n(III) sulfite C) FeS iron(II) sulfide D) FeSO3 iron(II) sulfite e2(SO4)3 iron(III) sulfi e 8. The correct name for Ni(CN)2 is . A) nickel (I) cyanide B) nickel cyanate C) nickel carbonate D) nickel (II) cyanide E) nickel (I) nitride 9. An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is B) l702+ C) 19F+ D) 19F" E) l7NeZ+ 10. When the following equation is balanced, the coefficient of nitric acid is N205 (g) + H20 (1) ‘9 HNO3 (3(1) A)5 C) 3 D)4 E)1 11. A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% 0 by mass. The molecular weight of the compound is 136 amu. What is the molecular formula? A CgHgO B) ch40 C) C4H4O D) chlzo E) C5H602 12. What is the maximum mass in grams of NH3 that can be produced by the reaction of 1.0 g of N2 with 3.0 g of H2 via the equation below? N2 (g) + H2 (g) —> NH3 (g) (not balanced) A) 2.0 C) 0.61 D) 17 E) 4.0 13. Calculate the percentage by mass of nitrogen in PtC12(NH3)2. A) 4.67 QED C) 9.90 D) 4.95 E) 12.67 14. How many oxygen atoms are there in 52.06 g of carbon dioxide? A 1.424 x 1024 B) 6.022 x1023 C) 1.204x1024 D) 5.088 x1023 E) 1.018x1024 15. Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: 2NaN3 (s) —> 2Na (s) + 3N2 (g) How many grams of sodium azide are required to produce 18.0 g of nitrogen? A) 0.964 B) 0.428 C) 41.8 E) 62.7 16. The net ionic equation for formation of an aqueous solution of Nil; accompanied by evolution of C02 gas via mixing solid NlCO3 and aqueous hydriodic acid is A) 2Nico3 (s) + H1 (aq) —> 21120 (1) + co2 (g) + 2N12+ (aq) B) NiCO3 (s) + r (aq) —9 21120 (1) + co2 (g) + M“ (aq) + H1 (aq) D) Nico3 (s) + 2H1 (aq) —> ZHZO (1) + 002 (g) + N112 (aq) E) NiC03 (s) + 2H1 (aq) —> H20 (1) + co2 (g) + Ni2+ (aq) + 21' (aq) 17. Which hydroxides are weak bases? 1) Sr(0H)2 2) KOH 3) NaOH 4) Ba(OH)2 A) 2,4 B) 1,2,3,4 C) 2,3 D) 2,3,4 one of these is a weak ase. 18. In which species does sulfur have the highest oxidation number? A) $3 (elemental form of sulfur) B) H28 C) 802 D) H2803 19. One method of removal of metal ions from a solution is to convert the metal to its elemental form so it can be filtered out as a solid. Which metal can be used to remove aluminum ions from solution? A) zinc B) cobalt C) lead D) copper none oft ese 20. Based on the activity series, which one of the reactions below will occur? A) Zn (s) + MnIz (aq) —) ZnIz (aq) + Mn (s) B) SnClz (aq) + Cu (8) —> Sn (s) + CuClz (aq) <9» D) 3Hg (l) + 2Cr(N03)3 (aq) —> 3Hg(NO3)2 + 2Cr (s) E) 3FeBr2 (aq) + 2Au (s) —> 3Fe (s) + 2AuBr3 (aq) 21. Zinc is more active than cobalt and iron but less active than aluminum . Cobalt is more active than nickel but less active than iron. Which of the following correctly lists the elements in order of increasing activity? A) Co<Ni<Fe<Zn<Al B) Ni<Fe<Co<Zn<Al ‘9 Ni<Co<Fe<Zn<A D) Fe<Ni<Co<Al<Zn E) Zn<Al<Co<Ni<Fe 22. Which of the following reactions will not occur as written? A) Zn (S) + Pb(N03)2 (21(1) —> Pb (S) + Zn(N03)2 (MI) 3 M ; s) + Ca(OH)2 (aq) —> Ca (s) + Mg(OH)2 a - C) Sn (s) + 2AgNO3 (aq) —> 2Ag (s) + Sn(NO3)2 (aq) D) Co (s) + 2AgCl (aq) ——> 2Ag (s) + CoClz (aq) E) Co (5) + 2H1 (aq) —> H2 (g) + C012 (aq) 23. How many milliliters of a stock solution of 11.1 M HN03 would be needed to prepare 0.500 L of 0.500 M HNO3? A) 0.0444 C) 2.78 D) 44.4 E) 0.0225 24. A solution is prepared by adding 1.60 g of solid NaCl to 50.0 mL of 0.100 M CaClz. What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL. B) 0.647 C) 0.132 D) 0.232 E) 0.547 25. Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride: Ag+ (aq) + or (aq) —> AgCl (s) Silver chloride is virtually insoluble in water so that the reaction appears to go to completion. How many grams of solid NaCl must be added to 25.0 mL of 0.366 M AgN03 solution to completely precipitate the silver? A) 9.15:410'3 B) 1.57x10'4 D) 0.157 E) 6.39x103 Activity Series Metal Oxidation Reaction Lithium Li xi Li+ + e— Rubidium Rb F\ Rb+ + 6— Potassium K \=‘ K+ + e“ Barium Ba \=‘ Ba2+ + 26‘ Calcium Ca x=‘ Ca2+ + 2e“ Sodium Na F‘ Na+ + e— Magnesium Mg F\ Mg2+ —|— 2e— Aluminum A1 \=‘ A13+ + 3e— Manganese Mn F‘ Mn2+ + 2e‘ Zinc Zn # an+ + 2e— Chromium Cr \——’ Cr3+ + 3e— Iron Fe \1‘ Fe2+ + 2e— Cobalt Co \=‘ 002+ + 2e— Nickel Ni \——A N i2+ + 2e— Tin Sn \=‘ Sn2+ + 2e— Lead Pb \Z‘ Pb2+ —— 2e— Hydrogen H2 \= 2 H+ + 2e— Copper Cu \:\ Cu2+ + 2e— Silver Ag # Ag+ —— e— Mercury Hg # Hg2+ + 2e— Platinum Pt \=‘ P13“ + 2e— Gold Au \=‘ Au3+ + 3e— Metals at the top of the table are most easily oxidized. \ n _ S. N _ moan Em 3 mo. NNN . 3&3 55 _ “E n o: 9: meme ~29 88m 932 $31 u _ .0 mm 2 cm a _ DE 7 F mm =< E b 3 mm _ .qm _ mm _ mm _ a 0m E 3 . E 00 02 Do hmfl mnAN~ Tow: Nv‘oofl :meH .0 _ am am _ E E :2 wH A a 0m C 0%? mowm mm.mm MZVoU WNHR m E> ('1 m: E> 5‘: SNH a: (49>. C <> 3 <>H 2 4H: rub; .. . 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121Exam1 - Dr. Grandinetti Chemistry 121 Monday Spring...

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