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Wyslouzil%20midterm%201

Wyslouzil%20midterm%201 - Dr Wyslouzil Chemistry 121...

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Unformatted text preview: Dr. Wyslouzil Chemistry 121 Thursday Autumn Quarter 2007 October 18, 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. G) M1 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. 1) Fill in the IDENTIFICATION NUMBER starting in COLUMN A with your Carmen Student ID Number. g) DO NOT fill in sex or birth date. Find lab da /time, then T. A. and enter two digit section number. Tuesda 6 30 Thursda 2. 30 Brian Alberding David Mata Siyu Tu Glen Cox Guang Li Jimmy Martin Michelle Aaron Shaver Ferinand Bei Zhao Scott Plunkett Bei Zhao Marc Coons 2. When the proctor gives the signal, but not before, check to see that there are 9 numbered pages, a Periodic Table and Solubility Guidelines. 3. There are 30 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 thaw 1. [5 pts] Calculate the following to the correct number of significant figures. (5.15 + 82.3) x (0.024 + 3.000) a) 264 b)264.3 c)264.30 d)298 e)2.6x102 [6 pts] Consider the date obtained for the length of an object as measured by three students. The length is known to be 14.54 cm. Which student has done the most precise determination? 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) 14.3 14.2 14.8 14.9 14.8 [6 pts] A mineral sample has a mass of 24.3 g and a volume of 3.5 cm3. The mineral could be sphalerite (density = 4.0 g/cm3), cassiterite (density = 6.99 g/cm3) or cinnabar (density = 8.10 g/cm3). Which is it? a) sphalerite b) cassiterite c) cinnabar [6 pts] Which of the following statements is correct? ) Both elements and compounds are pure substances. ) Elements, but not compounds, are pure substances. ) Compounds, but not elements, are pure substances. ) Neither compounds nor elements are pure substances. ) [5 pts] Elements in Group 6A are known as the A) alkali metals B) chalcogens C) alkaline earth metals D) halogens E) noble gases [5 pts] Which pair of atoms constitutes a pair of isotopes of the same element? A) 14X 14X D) 19X 19X 6 7 10 9 B) 14X 12X E) 20X 21X 6 6 10 11 C) 17X 17X 9 8 79Br' [6 pts] The ion 35 contains: a) 35 protons, 44 neutrons, 35 electrons b) 35 protons, 44 neutrons, 34 electrons c) 44 protons, 35 neutrons, 36 electrons d) 35 protons, 44 neutrons, 36 electrons [5 pts] What is the symbol for the sulfate ion? a) 3042' b) 8032' c) 3022' d803' e)SO4' [5 pts] What is the formula for titanium (IV) sulfide? a) TiS b) Tis2 c) TigS d) Ti4S e) TiS4 10. 11. 12. 13. [5 pts] What is the chemical name of Ni(N03)2? a) nickel dinitrate b) dickel nitrogen oxide 0) nickel nitrite d) nickel nitrate e) nickel nitride [5 pts] What is the formula for perchloric acid? a) HCIO b) HC|03 c) HCIO4 d) HC|02 e) HCI [6 pts] Balance the following equation. What is the sum of the coefficients of the reactants and products? __Ag+_HZS+_Oz—>_Ang+_H20 a)14 b)12 c)11 (1)10 e)8 [7 pts] To three significant figures, what is percent of fluorine in cryolite, Na3AlF6? (Atomic weights: Na = 22.99, AI = 26.99, F = 19.00) a) 54.3 b) 41.8 c) 24.8 d) 19.4 e) 12.4 14. 15. [7 pts] A hospital patient is given a solution containing 9.00 x 10'9 g of iodine-131 (isotopic weight - 131 ). How many atoms of iodine are present? a) 1.36x109 b) 1.36x108 c) 4.14x1o15 d) 4.14 x1013 e) 6.68 x1017 [7 pts] When 0.880 g of an organic compound containing carbon, hydrogen and oxygen is burned completely in oxygen, 1.760 g of C02 and 0.720 9 H20 are produced. What is the empirical formula of the compound? (Atomic weights: carbon = 12.01, H = 1.008, O = 16.00) a) CHO b) CgHzO C) CzH4O d) C3H602 e) Cal-I504 16. 17. 18. [7 pts] A compound consists of 15.5% carbon, 23.0% chlorine and 61.5% fluorine by mass. What is the empirical formula of the compound? (Atomic weights: C = 12.01, CI = 35.45, F = 19.00) a) ccn= b) C2CI2F c) C2C|F2 d) 02CIF5 e) C2CIF3 [6 pts] Calculate the number of moles of Fe304 produced from 0.75 moles of Fe by the following reaction. 3Fe +4H20—> F6304 +4H2 a) 2.25 b) 0.75 c) 0.50 d) 0.25 e) 0.15 [6 pts] Which of the following setups is correct to calculate the number of moles of Gig required to produce 6 moles of PCI3 according to the following equation? GClz + P4 —> 4PC|3 a) 6 moles PCI3 x 6 moles PCI3 b) 6 moles PCI3 x 4 moles PCI3 4 moles Cl2 6 moles C|2 c) 6 moles PCI3 x 6 moles CI2 d) 6 moles PCI3 x 4 moles 0'2 4 moles PCI3 6 moles PC|3 Questions 19-21. The reaction of methane with chlorine produces carbon tetrachloride by the following reaction [ MW: CH4 = 16.04, Clg = 70.90, CCl4 = 153.82, HCI = 36.46] CH4 (9) + 4 Clz (g) —> CC|4 (I) + 4HC|(g) 19. [6 pts] When 100.0 g of CH4 and 400.0 g of Gig are allowed to react, what is the limiting reagent? a) CH4 b) Cl2 c) CCI4 d) HCI e) there is no limiting reactant 20. [6 pts] How many moles of excess reagent remain after completion of the reaction? a) 4.82 mol b) 6.23 mol 0) 1.41 mol d) 1.55 mol e) 5.64 mol 21. [7 pts] How many grams of CCI4 can form under these conditions? MW: CCI4 = 153.82 g/mol a)22.69 b)7389 c)54.2g d)185g e)217g 22. 23. [7 pts]GeF3H is formed from GeH4 and GeF4 in the combination reaction: GeH4 + 3GeF4 —> 4GeF3H If GeH4 is the limiting reactant, what is the theoretical yield starting with 100 g of GeH4? (MW: GeH4 = 76.64 g/mol, GeF4 = 148.60 g/mol, GerH = 130.61 g/mol) a)170g b)511g c)43g d)6829 e)117g [7 pts] For the formation of GngH given below, lab experiments show that the reaction yield is 92.6%. How many moles of GeF4 are needed to produce 8.00 mol of GeF3H ? GeH4 + 3G6F4 —> 4GeF3H a) 3.24 mol b) 5.56 mol 0) 6.48 mol d) 2.78 mol e) 2.16 mol 24. 25. 26. [5 pts] Which of the following are strong electrolytes? HCI NH3 KCI a) HCI, KCI b) HCl, NH3 , KCI c) HCI, HC2H302, NH3, KCI d) HCI, HC2H3OZ , KCI e)HC2H302 , KCI [5 pts] A weak electrolyte exists predominantly as in solution. a) atoms b) ions 0) molecules d) electrons e) an isotope [6 pts] When the following aqueous solutions where mixed which pair gave a precipitate? a) HBr + KOH b) LiOH + Mg(NOs)2 c) PbNOg + Sr(CgH302)2 d) NaOH + H02H302 e) NH3 + HCI 27. 28. 29. 30. [6 pts] When sulfuric acid is neutralized by sodium hydroxide in aqueous solution, the net ionic equation is a) 5042' (aq)+2Na+ (aq) —> Na2S04 (aq) b) sof- (aq)+2Na+ (aq) —> NaZSO4 (s) c) H+ (aq)+OH‘ (aq) -9 H20 (1) d) st04 (aq)+20H‘ (aq) —> H20 (1)+ sof- (aq) e) 2H+ (aq) + 2NaOH (aq) —> 2H20 (1) + 2Na+ (aq) [6 pts] Calculate the molarity of a solution of 91 g of MgClg in 2.0 L of solution. (Atomic weights: Mg = 24.30, CI = 35.45) a) 0.18 b) 0.24 c) 0.48 d) 0.96 e) 1.2 [5 pts] What is the oxidation state of Cr in the compound Cr(OH)3? [6 points] Which of the following would require the largest volume of 0.100 M sodium hydroxide solution for neutralization? a) 10.0 mL of 0.0500 M phosphoric acid b) 20.0 mL of 0.0500 M nitric acid 0) 5.0 mL of 0.0100 M sulfuric acid d) 15.0 mL of 0.0500 M hydrobromic acid e) 10.0 mL of 0.0500 M perchloric acid 3.08 2.03 2.me 0:2 h HA oZ 62 Em m2 NS 2: 02 8&2 mm a 3.45 :2: o 5A 8w woAmN hofivm hofivm oodvm EVEN L$.me IIII.I mm mm wo mm #0 mm 3on wmfiwfl 3&2 III mm mm 3 OWNS mmwfl 3.an 342 3.02 E A: 5 am am 8 3 E 8 . Q 85 E5 55 m: H: 8me v33 :28 D mm :H. mm a om 8.2: «Ni: 3.0: 2.2; 5.3 Em 62 In 00 «Q s 8 an mm SNmm 340.3 2&3 Egg 5 mm mm 3 E k: 03 m3 «3 moEcwu< hum-3w 8.8.“ Saw «M km S monw mm mawom mmwom NSN mmvom awoom 862 8.3: mm.me 8.22 3&2 May mmsfl 3.0.2 o cm 5 an E mm 3.. mm B «H E 5-3 «m 5 Vm mm mm 5 0w 3. mm m» N» Sanm om m 8.53 In E m mES 3m: m3: EN: 5:2 5% .33 3% mm: 53 SS 33 am :m :H 60 w< 0H. 32 QZ IN W hm am a om 3 M? S Q S Q ow mm mm b 8.: SS 9% 3.3 2.8 3% 8.8 3.% mm? 8.3 8.3 2.3 m< o0 «U :N :U :2 ID > i. «U M mm Nm 3 om ON 2 «N mm mm om 2 3 om 8 mm mm 8 S : 2 a I w w v M W 3 mm mm m a 1% m: m: E> E> :5 55 m3 m> m2 ma 2 «Z 2 E 2 S : . . 8.2 8.: SE 5.2 8.0 v3 02 rm 0 Z O m cm— HA 5 o m w m Ammmfiv 8 2 E mH Emwok 288a “tagged T 3&2 N woo; <5 <> <2 3: SEE? Hausa T i SH m H Hopfisz 350$N A! D» TABLE 4.1 Solubility Guidelines for Common Ionic Compounds in _Water Soluble Ionic Compounds I‘m‘po‘rt‘a'n't Exceptions Compounds containing N 03-” None C2'H302_ None Cl‘ Compounds of Ag+, HgZZJr, and Pb2+ Br” Compounds of A-g+, 'ngfi, and Pb2+ 1— Compounds of Ag“, Hg“, and Pb2+ 3042‘ Compounds of SW, 3212+, Hg”, and lab-2+ Insoluble IOnic Compounds Important Exceptions Compounds containing 32— Compounds of NH4+, the alkali metal cations, and Ca2+, Sr2+, and Ba2+ C032“ Compounds of NH4'Jr and the alkali metal cations PO43_ Compounds of NH4+ and the alkali metal cations OH‘ Compounds of the alkali metal cations, 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‘) —> Ca2+(aq) + 2e— Sodium Na(s) .——> Na+(aq) + 6— Magnesium Mg(s) —> Mg2+(aq) + 2e— Aluminum Al(s) —> A13+(aq) + 3e— Manganese Mn(s) —> Mn2+(aq) + 2e— Zinc Zn(s) ——> Zn2+(aq) + 2e— Chromium Cr(s) ——> Cr3+(aq) + 3e— Iron Fe(s) —9 Fe2+(aq) + 29— Cobalt Co(s) —> C02+(aq) + 2e— Nickel Ni(s) —> Ni2+(aq) + 2e‘ Tin Sn(s) ——> Sn2+(aq) + 2e— Lead Pb(s) ——> Pb2+(aq) + 2e— Hydrogen H2(g) _) 2H+(aq) + 2e" Copper Cu(s) —> Cu2+(aq) + 2e— Silver Ag(s) —> Ag+(aq) + 6— Mercury Hg(l) ——> H 2+(qu) + 2eH Platinum Pt(s) —> Pt +(aq) + 2e~ Gold Au(s) —-—> Au3+(aq) + 3e— ...
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