Chemistry 121 - Subramaniam - Midterm 1

Chemistry 121 - Subramaniam - Midterm 1 - Dr. Subramaniam...

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Unformatted text preview: Dr. Subramaniam Chemistry 121 Tuesday Winter Quarter 2006 Jan 31, 2006 First Midterm Exam 6:30 - 7:48 PM NameiL _ Lab. Instructor Aka r\€\/\ 6k. Signatui _ Rec. Instructor A ‘4 0 My :4 m— ‘ IN STRUC TION S 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. YOUR TA'S NAME, 3. FILL IN THE CORRECT TWO-DIGIT NO. FOR YOUR SECTION ON THE ANSWER SHEET UNDER COLUMNS "K" AND "L" OF SPECIAL CODES. 0 Fill in the Identification Number starting in Box A with your Social Security Number. g) DO NOT fill in sex or birth date. Find lab day/time, then TA. and enter two digit section number. Monday 2:30-5:18 I Wednesda 2:30-5:28 Sara Plowman 64 Dvae Turner 68 Akansha Dwivedi 65 Yi Guo 69 Meredith Cline 66 Hai Liu 70 Yi Guo 67 Dennis Mayo 7] Merrill Perlow 72 J Doris Su 73 2. When the proctor gives the signal, but not before, check to see that there are 8 numbered pages, and a periodic table. There are 29 multiple choice questions worth 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 backs of the question sheets for scratch work, but note that only the marks you make on the answer sheet will be observed by the grading equipment. The time allowed is 1 hour, 18 minutes. At the end of the examination, hand in the ANSWER SHEET before leaving the room. L») >‘S7‘ \ l. \ /{pts) How many of the following numbers have m significant figures? / 3.0156 16.00 0.004 1.35 x 104 0.001405 a) 1 b) c) 3 d) 4 e) 5 (5 pts) The answer of the following problem should be correctly reported to significant figures. 10.10 + 0.53 1.0112 a) 2 b) 3 d) 5 e) 6 (5 pts) Consider the data obtained for the length of an object as measured by three students. The length is known to be 14.5 cm. Which of the conclusions summarizes the data? Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 A) 14.8 14.2 14.5 14.7 14.3 B) 14.7 14.8 14.9 14.8 14.8 C) 14.4 14.4 14.8 14.9 14.8 a) student B has done the most precise work and student C the most accurate work. <75)» student B has done the most precise work and student A the most accurate work. c) student C has done the most precise work and student B the most accurate work. d) student C has done the most precise work and student A the most accurate work. e) student A has done the most precise work and student C the most accurate work. /’ 4. . pts) A water sample is reported to have a “hardness” of 40.0 grains of calcium ions per gallon. What is the calcium ion concentration in mg/L? \ t 1 grain = 64.8 mg 4 quarts = 1 gallon 1 quart = 0.9464 L / . , 1 ‘ ('- 17). T \ ;’<.;r it x >< ’”_’ Q” Q i /a,\ Li 'r-"l"; “("154 L b) 292 ’ ’3’" “" * c) 762 g (-1 d) 342 e) 548 ‘5. (7 pts) How many liters of air are in a room that measures 10.0 it x 11.0 ft and has an 8.00311 ‘1 ceiling? f 1ft=12in 1in=2.54cm 1L=103cm3 )Lkfit‘hir a) 92.8 a: ' b)26.8 (U 155 x , H134)? (M7; ‘ L : c)2.68x107 ‘W ‘f x LL01”— x a K J ,7 d) 5 1‘ \23 \l .p? like Cw», e)2.49x10‘ » In [I ’ km X r, r “ I C , a J c lily}, (5 pts) Which of the following neutral atoms has exactly 11 electrons? a) potassium—39 b) phosphorus—31 c) silicon-28 r 7‘ d) sodium—23 e) sulfur-32 ,1 34 \ 7, (5 pts) The species 7"Sez' contains: -\ a) 34 protons, 36 electrons and 56 neutrons "\ I b) 32 protons, 34 electrons and'35 neutrons @34 protons, 36 electrons and ‘35 neutrons d) 36 protons, 34 electrons and 55 neutrons e) 34 protons, 35 electrons and ‘36 neutrons "r \ 10. 11. (5 pts) Which of the following elements does not form a stable anion? a) Nitrogen b) flCopp/e‘r/L/~ c) Fluorine d) Oxygen e) Chlorine “Va/"J’- (5 pts) Select the correct formula for an ionic compound. 9.91104 bfirgcg eggs: dim \e) BaO { /'1 \\\ , "i / "3 i x i "" (7 pts) Which of the following compounds is incorrectly named? ( ‘1‘ .5 i7 l ( "pg—Wm? ‘1 A ~ 1 to; r - CC 21) H 10 Chloric acid ¥ L bfiigSOgéaCI) Sulfurous acid ( 2 J8 cYPIQPCMaq) Phosphoric acid 7" € ’ c QW’ Hydrosulfuric acid r A . ‘- t: u j,» . .3 u 5 e)/H‘§SQ/4{aq) Sulfuric acid ’ ‘ (7 pts) What is the chemical formula for Cobalt(III) sulfide? 21) cos b) C038 c) CoS3 $363933}, K ' e) C0233 (7 pts) The correct name for the compound with the formula Zn3(PO4)2 . b‘)¥Zinc phosphide '/"c) inc phosphate " ' 0§phate e) Zinc phosphite pts) Write and balance an equation for reaction of phosphorus trichloride with water to xi” Yproduce phosphor‘hs acid and hydrochloric acid, The sum of all coefficients in the balanced fix equation is . (Don’t forget to count unwritten “1 ") , 7 . , 7 "Ci Péig 3‘ JAEC '3 in.) 5 l [\A \\ a a) 9 1.65%., c) 7 d) 6 e) 5 / _/ < A4. (5 pts) When the following equation is balanced, the coefficient of O2 is . 1 /“‘ 1 x ,\ “(‘Lhfifls {22, s} #515 He M0149“) + £30} CGHIDS3 +__ 02 -> _ CO2 + # H20 + _ SO2 a) 12 b) 16 c) 19 (""15'33‘ e) 28 \ 15. (5 pts) What is the mass percent of Aluminum in A12(SO4)3? ‘ I ;(;.g.ayt\, » 25(29m3 +‘E/l6m\ L a) 7.886% (Jam) A» 6mm c 1‘1? x f K- 1- ‘/ c)21.93% 1V \ K \Ciu '- d)45.70% * la \‘ K 1,1 e)35.94% “ ‘ 16'. (5 pts) Calculate the number of oxygen atoms in 2.72 g of A12(SO4)3? 0,73 11> Alla/CCQ—b X ’qua 17“) wing 21) 9.88 x 102l b) 6.02 x 1023 c) 7.22 x 24 . x 1022 e .01 x 10'3 r l / 17/, (7 pts) Tetrahydrophthalic acid was analyzed and was found to contain 56.47% C, 5.92% H and \ , 37.61% 0. Determine the empirical formula of tetrahydrophthalic acid? "’ a L, MK." ( q 1 J C \ Wu“ C > / x B : l gum/ammo: 5 ‘ ’~ W2 M 7*; — 3 0, wk v r- 4 6 3 4 c) CsHsoz era} K Fm \ r\:.\ H r ’ _‘/\ x‘c' : g d)C5H,203 J i A, “- 94:7 “A ‘ “ ’ e) CsHsol 5" 5:“ ‘ '2 " ., ‘ 1‘ \ l» L‘ x 'w r*-._\ C _\ vué \ C K - a. n ’ /. .—-—-— : I . «x. E] C L( a, J c; C \ ?\ 1/8. (5 pts) Caproic acid, which is responsible for the foul odor of dirty socks, has an empirical \/ formula of C3H60. Its physical properties lead you to expect a molecular weight of 116. The molecular formula is: 7) D, 4, g ( I (“cg L [L _<:.(, #9”: C; :_ C H r" < .r V. (-511 ' i '5 " «3 we!» TL, 3) C3H60 13) CanO C) C12H24O4 d)C12H602 i/r-el'C'an'Oz' 7 (7 pts) Nicotine, a component of tobacco, is composed of C, H, and N. Complete combustion of r l) 115.250 mg sample of nicotine produced,L4.242 mg of CO2 A.083 mg of H20. How many C'L“ m'lli am In fnitro d'd th sam l co t ‘ ? ~ 4 If“ s( g)o gen 1 e pe narn O‘C‘uwrsfin‘polc Logoigcflgg: Ll‘t Q1 (1,, L'?’ i 3 1.36m b 1.15m ,5" c 0.907m , ) g ) g M g 1 p ‘_ ‘ x,” w ‘ I, d) 0.812 mg c) 0.764 mg Gama-i a 51%,Cr(“3\_(;¢ t a __ (1‘ ,M “63-77, (\ Hf; l ,1": \ 20. (7 pts) Aluminum sulfide reacts with water as described below. AIZS3(s) + 6HZO(l) -' 2A1(OH)3(s) + 3 HZS(g) What mass of A1(OH)3(S) is produced by complete reaction of 105 g of Alzs3(s)? a)7-00X1°‘3g li- ‘» c M S \ m M» r: r ,\ Aim 7% Mr a b)14.0x10'3g 5 3 3x 35X ‘ *X J")(\ c) 7.80 g HQ.“ :3 i ml M5“ \ , j Mm xi ., i , kg" 1 as I \V 1. (7 pts) Benzene reacts with bromine, Brz to form brornobenzene as described below. C6H6(0) 4— 39(9) '9 CsHsBrQ) 'l' HBr(g) Calculate the amount of bromobenzene in grams that can be produced from reaction of 30.0 g of CGHG and 65.0 g BIZ? 2:0 : ; «J (‘4 ‘3 .J {lbw ,1 l ,s 55-2} * 5 WALAAK . ” “’“f“x ‘g V 7lt-l':<o :(‘H‘ 5 fl i :“iiyf \ a (" H" \J’; Hgigt 3(07 '- / 3) 6 3%“ 0L ! d) 63.9}; K 5;“ (2R 1 \., .f—e‘A » ; t: . ,4 (k :_ ' \ l s n \r )*m““”“716” j/ g . r- CV” l ‘ 1/722. (5 pts) Calculate the percent yield for the reaction described in the previous question, if 56.7 g of bromobenzene is actually produced, “Mi/a- b 94.0‘7‘ the l)‘ ’ f ., 83% . A, I. 1 223/ l/ (5 pts) Which of the following is an example of a strong electrolyte? amid“ NH3 .12) HC2H302 «1) HF e) CZHSOH r’ / iv (:1 ‘ w '1: , “‘- w ‘1‘?» fix) K+ ffl’ L/H/ F C» For questions 24 and 25, complete the following equa 'ons, write/net ionic equations ans chOOSe your 1 . __ . . . 4 \ ' answers from this llst. / "if " L [2! .» N3 “3- "r " h“ - ‘r” ’r L \.,V i) Baco3m + Hc1(m :. «' d \ ii) HF.m + KOHa, iii) Cr(OH)3m+ HNOM iv) Nags/2., + sto4M v) KCl 4— AgNO3 6 ‘- ' .- ’ r 4'“ ‘ 4: bf ~ ~ M9 * Mn? -~ if " ~ ‘ a . (7 pts) How many reactions given above whose net ionic equation show just one product? a) 5 b 4 _2\ e) 1 \ (5 pts) How many reactions given above whose net ionic equation show formation of a gaseous product? 1 a) 1/ By: C) 3 d) 4 e) 5 (7 pts) Three test tubes contain clear solutions of Sr(N03)2, (NHQZCO3 and Ba(OH)2 (one compound per test tube). Solutions of the reagents listed below are available. Which of the reagents would identify the contents of the three test tubes by forming a precipitate with Sr(NO3)2, a gas with (NH4)2CO3 and a precipitate with Ba(OH)2? b) NaCZH3OZ c) KClO4 d) HNQQ e) (NH4)ZS \. “MO (is Jr \ HM»; q twin 4 L3,: (It‘s 7 (7 pts) In which of the following species does phosphorus have an oxidation number of +5? fl . s. »\ .\ ” ii a) H31302 b) PF3 c) PH3 K d) H3P/O4/ c)H3P03 (7 pts) Balance the following equation by the change—in—oxidation—number method? ,7» n.___.n,,,.l.._ _. "fr Mom 4.67} LL13 «19 “~47; rt 3 MnSO4 + b02 + H2804 ~ HMnO4 + P{bSO4 + H2 I . 46 The coefficient of PbSO4 in the correctly balanced equation is a)2 b)4 5116 e)7 3 (7 pts) Based on the activity series, which one of the reactions below will occur? )Q/Zn(s) + Mn12(aq) ~ ZnIZ(aq) Mn(s) + b) SnCl (aq) " Cu 5 * Sn(s) + CuCl aq) w W" , fl ‘V A_,Pb(5) " I, > W + r w Pb(N03)z f" + 2 moagtaqiwwmgmmaw ‘3” " 26(3)“ e) 3 FeBrz(aq) + 2 Au(s) e 3 Fe (5) + 2 AuBr3(aq) Useful information: 1 mole = 6.023 x 1023 chemical units TABLE 4.1 Solubility Guidelines for Common tonic Compounds in Water Soluble Ionic Compounds Important Exceptions Compounds containing NO3‘ None (3211302— None Cl‘ Compounds of Ag”, Hg“, and 'I’b2+ Br“ Compounds of Ag“, Hg22+, and Pb2+ 1' Compounds of Ag+, 1—132“, and Pb2+ SO42" Compounds of Sr“, Ba“, ng“, and Pb” Insoluble Ionic Compounds Important Exceptions Compounds containing 52' Compounds of NHf, the alkali meaty” cations, and Ca2+, Sr”, and Ba2+ C032_ Compounds of NHJr and the alkali metal cations (14 P043“ Compounds of NH4+ and the alkali metal cations [158 OH' Compounds of the alkali metal cations, (1);) and Ca“, Sr“, and Ba2+ Metal Oxidation Reaction Lithium Li(s) —~——> Li+(aq) + e’ Potassium K(s) —> K+(aq) + e— Barium Ba(s) —> Ba2+(aq) + 2e— Calcium Ca(s) —a Ca2+(aq) + 2e— Sodium Na(s) —) Na+(aq) + e' Magnesium Mg(5) —-——> Mg +(aq) + 26' Aluminum Al(s) —> A13+(aq) + 3e“ Manganese Mn(s) ——) Mn +(liq) + 2e— Zinc 211(5) ——> Zn2+(uq) + 2e“ Chromium Cr(s) ——> C +(aq) + Se— Iron Fe(s) —-> Fe2+(aq) + 2e— Cobalt Co(s) ——-> Coz+(aq) + 2e" Nickel Ni(s) —) Nl2+(aq) + 2e— Tin 511(5) ——> Sn2+(aq) + 2e— Lead Pb(s) —> Pb2+(aq) + 2e” Hydrogen H261) we 2H+(aq) + 2e— Copper Cu(s) —-+ Cu2+(uq) + 2e' Silver Ag(s) ———) Ag+(aq) + e— Mercury Hg(l) ———) H 2+(aq) + 2e" Platinum Pt(s) ——) Pt +(aq) + 2e" Gold Au(s) ———> Au3+(aq) + 3e“ Ew u S me from w MN $2 mQLOm >95, >255: H<w A B 1: Aflmm ho 3 SEN 3 m: :g OCHUHH Lu NE SN 3 Iv >353 2:539, Iv E2523 @532 IV Wipe/5 £230 29%: Gamma (A: <5 <5 5 E.» B Nun Ob Mg on. Numbw MAL om Mum .oa fl 3 a 3 On Hu 6% mo aim g8 35¢ :38 cm wq 05 WW NAhbq $5.3 E 3 0». N28 N<> <> 3 mm Ma 5.: we woo mm 3: Nmubm Nuupo 3 mw 3 HS Kc RPS. 3905. 2: gm 83o <5} Nombm Nombw Nombw uwubn 2 H: a :P3 Hon Bu 2o E. 395 Nmo‘ Z ...
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This note was uploaded on 04/09/2008 for the course CHEM 121 taught by Professor Wyzlouzil during the Winter '07 term at Ohio State.

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Chemistry 121 - Subramaniam - Midterm 1 - Dr. Subramaniam...

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