Test1_F07_key - Chemistry ‘1035 General Chemistry Test 1...

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Unformatted text preview: Chemistry ‘1035 General Chemistry Test 1, Form A You have 75 minutes to complete this test. A periodic shad and reference tables are attached to this test. The Honor Code is in force on this test: you may neither give not receive aid on this test. Turn in only your opscan street when you are finished. Scores witl be posted tomorrow morning on Blackboard l. in class, we have described chemistry as a study of: (l) Subatomic particles (2 Structurai properties of gases Electron transfer 4) All of the above .2. W1 of‘tiie foiiowing is a chemicei change? @ urning a marshmallow. (.-) Boiiing water. (3) Siicing a loaf of‘bread. (4) Chopping a tog. 3. An empty viai weighs i000 g, but when filled with liquid mercury, it weighs 142.30 g. If the density of Hg is i3.5.3 gfcm3, what is the volume ofthe vial? (1) 13.53 mL JLfZIE-fp ”(C7,C2_5 (2) 5.35 mL. V: "W (3) 10.52mL [Be 3.5375 (4) ~77ml. \/ a 4?: 770415: «777%— 4.. Samples of'henzoic acid are given to four students. The sampies are supposed to have a mean weight of 5.72 g. Based on the raw data in grants (shown below), which student’s measurements are the most accurate? 5.41 5.72 5.55 _ . 6756 =7— 7G {(2)}“572 5.74 5.70 6”,"72. =2 E (3) 5.56 5.77 5.73 (@550 5.48 5.51 5" (9?” 233 3,50 :— {if 5. According to French legend, the Beast ofGévaudan {a werewolf) could be kilied with a silver bullet. Recentiy, a siiver buttet (that is said to have dispatched a werewolf) appeared for saie on eBay. Since elemental anaiysis would involve dissolving the bullet, the owner refused to have it analyzed. However, an independent lab did measure the density of the bullet. The artifact weighed 53 .0g and dispiaoed 5.04 mL of‘water. 15 this a reai “silver bullet”? write: The density ofsilver is 10.5 glems, the density of lead is ”.34 g/cm3). (i) The bullet is silver. (2) The buiiet is iead. (C & M /‘@ 5213 .2:- M I "’7 (3) The buiiet is 50% silver and 50% iead. 5*: 04¢”? (4) The buiiet is not real. Fall 2007 page 1 of6 Form A 6n Seiiaite, a mineral of'magnesium, is a compound of’the metal with fluorine. If’a 6 .00 g sample of’sellaite contains 2.20 g of'Mg, what is the % mass fine-{ion of}: in the sample? (1 50.0% . ("3 «2,2 M m £3323 ir Oct“)? 583% 6653;, 03 5’ Zr" / (3) 670% :9 ”F“- ., / we A , (4) 36.7/2: W b3 7, A compound of’lead and sulfur contains 200.0 g of'the metal and 40 ‘0 g of'the nonmetal. How many grams of lead are contained in 1,000 g of'the compound? (1) 16‘? g (2)200g 2663:?5’ 15, koagv‘s/é (3800s . 0 halt.— ”if: 8, What was the major scientific finding from Rutherford’s (IL—scattering experiment? ,2 The charge of'an electron, and then the mass of'an electron. 0 he nucleus contains ail the positive charge and essentially all the mass of’the atom" (3) Mass in conserved in a chemical reaction. (4) All atoms of’an element are identical in atomic number but not in mass, 9. What is the correct atomic notation of'the depicted atom? (1) égAt' (2) ttAr (4) not IO. Tritium, 3H, is an isotope of'hydrogen, The emitted electrons from small amounts of tritium cause phosphors to glow in “seifnpowered lighting”. How many neutrons does tritium have? (1) One Two (3) Three (4) None ii, An element has Z “—" ‘74, What is the most appropriate classification of the element? (i) Nonmetai Metalloid (3) etal (4) Halogen Fall 2007 page 2 of 6 Form A 12 The symboi and the atomic mass of the haiogen in period 2 are and amu. 1) No 20.179 (2) F 18.993 (3) c1 35.5.3 (4) Li 6.941 13. Which statement about chemicai bonds is incorrect? M (1) Ionic compounds are formed as the result of the transferring ofeiectrons T . (2) Covaient compounds are formed as the resuit of the sharing of electrons $7”; ‘2 . (3) Ionic compounds are formed as the result of the transferring of electrons, j ' @ovaient compounds are formed as the resuit of the transferring of'electrons.‘ i:— ' 14.. What is the formuia of chromium (III) oxide? (1) H3004 ' 13+— ‘15” (2) 0'0 1/, f.‘ 0 cm4 2-1 3 0 15 What is the name ofthe acid derived from the cyanide (CN') anion? (l) cyanoic acid cyanide acid iydrocyanic acid (4) hydrocyanide acid 16‘ It is the correct systematic name of CoO? (1) obait (Ii) oxide ' (2) cobait oxide (3) coibaltous monoxide (4) coco puffs i7, What is the mass% oil-i in ammonium bicarbonate? (Note: Nl-hHCOg, film 7906 g/mol) (a) 3.275% _ 2 (2) 117.2% -— M re /O<3 c .v, _51104% '77, 06 (6,3175% 5: asvsg i8‘ Cortisol is a steroid hormone {film 36247 g/mol). If the steroid, by mass, is 696% carbon, 8 ..34% hydrogen, and 221% oxygen, what is its moiecular formula? _ x - . c 69%» {-1201 5d? 7' ”‘2‘ 7" 2i .- 7' Laura/7 63,39 *‘r- G} 3? 35’ [4 33¢ (it) Gil—:50 O 22.1 '7‘ fem 1.33 ;? I :7 5 Fall 2007 page 3 of 5 Form A ' l 39. Baiance the reaction: EHJSO4(aq) +Z_NaOH(aq) —> MNa;SO.;(aq) +2FEOU) 20.. What mass of H2 is formed when 25.00 g of BEE-15 (.911 m 27.67 g/mol) reacts with excess water? flbaiamced equation is: Bgl~15(g)+ H200) w HgBO3(5) + HM) . J ., m H _ m 93g M: e é—é 'i“[ 2 5; [1007?73/w] (2) 111,8g x 5: . _ / I E: H’ . (3) 5.46g 27 6 E; ml 2 6 (4) 0.313g ~::.. 0 ‘ 2h 21, For the Wreaction, 21CE3 + BHZO % ICl + 1-1103 + SHCL if’600g of‘ICl3 are mixed with 100g of'HgO, which compound is the “iimiting reagent"? (Note: 31/! ICIg = 233.67 g/mel, and .71! mo m £8.02 g/mol) 3920 (1) H20 m 3 £621.. ..':—- 2,572. mi. ‘ ”Id/H ;, eafafi’ r» 2.572 M1213 2.315 2 K] “WE 1 33 9’ WM ' :0 e E; 5“ '17 ~ ' .... '3 6 L - i @ 13 fl. .-"-‘. jig—(29"— J; S’si’aifleei 1 K *_,__;.L-:_§~ (4) H103 ”:21? [5.62. ”hi. ‘ Malnffiaeefldg" S.S‘*I’fflf& ”2307 3H20 22.. What is the percent yield when 50.0g of'WO; (31’! = 231 .9 g/moi) are reacted with excess Hg to produce metaliie star: and 10.5 mL of’Hgo? (Note: density of’water is 1.00 g/mL). .. ms: “-2 0 0M W05+ 3442;; v + 3&6) A my} ‘2) 215% so , mamma— ————-3_ "4/ (3) 30.0% fiftthc‘g: 13"? £012,3FMM‘ jXJD‘ [fly I} d (4) 791% 7%» (+564 ef‘i" 3405‘; :_ 0,35’lfafiaeé. ? fl: 0 P ‘ g3,c9”flim“’lim ma! fi 0: {44' 2‘14""; W613: 23. n w many grams of KC! are needed to make 500 ml. Ufa 0.100Ni KCI soiution? (New: ..’M= 74,55 glmol). 24y 7.45 “- . S Fm] ) g (9 {@6341 "'"' -m———--—-v--—-~—7q S (3) 0.05005; 1 6 wt” (4) 0.0373 g ’ W ”"1“ ’7" 73:3 24. What is the molarity of'a solution prepared by diiuting 25.00 mi. ofil .OOM (32180.; to 750 mL? {1) 0,750M ‘/ 2 0.0507M fl H. /% 1 V; W” 2.9 0.0333M 30.0M ( i0) [£9,02%9,(;<) K @7301. K —_~_ 0, o‘aBB/W Fall 2007 page 4 01'6 Form A 25. @many ml, of- 7 .00M I-IC} are needed to react with 15.1g of CaCO; ( film 100 .09 gfmol)? (1) 51 L. (“Q5 (2) 100;. 2H6i + (gash -—7~r- @ (a. C7; + H2 (3) 75.4mL 19" m a {7369’ flcfifl (4) 302 mL mfg/5W3 2 HC, flMCSHQ “CD; /§b‘@’é¢wm€:s flaw/”o5 fir m _ (Q 3537285414" iflcjfgr" r41 1" pglmp @raal'azrm ( Rte/«13V VI: CRISOKGUL: ...
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