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Q1_09_Solutions - Dr Wyslouzil Chemistry 121 Tuesday Fall...

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Unformatted text preview: Dr, Wyslouzil Chemistry 121 Tuesday Fall 2009 Sepl29, 2009 Quiz 1 20 minutes Name Reclnetr. Two-Digit Seetion No. Lab inst. Carmen ID number .mn—-mu-u__—u_n_——nuw‘_.2.-—_a,_n———.=————_n-uua.mug.w...n-—-~nmg—w.w-awua-m-m_n_-n-...m_n.._,.....__—————-_h~~-‘_n__ {1 YOU MUST SHOW ALL WORK TO RECEIVE FULL CREDIT 1. (2 pts) What is the chemical name or symbol for each of the following elements? Lithium F Helium K , $3 {:9 W. . 1 a A ...-2- $ " . $3 2. i573; {352.5% 5222: 1 liml i“? :5“ M532»: {5 2. (2 pie) While working in the lab, you measured ihe following about a substance. 5 a. it was a lustrous solid. W? {E i b, it horned wrih an mlense whlte light to form a white solid. as“ In the blanks beside each observation, please note whether this is a physical or 3 chemical property of the material. 4%?)37 ‘ ‘ We 3. (9 pts) Complete the followmg conversaons: ES 2 a,” 2: N? 2 :l’l 3.2x105 kg to mg :23: :2“ ::2“ 5 3:33»:ng 2:; :2 :2 2 1 3, K C J {egg we? 2:" ‘5; Z “3‘ W4 ’ “a”: 2““: ’22 ”$2 2 “ 3 3’ 2» 2“,:3‘3 “ :ggfi x; 230.0 G5 to :15 V(\ ’3‘ "l "”2 I” ‘22-, 2 2.2:: M “‘ TS; *‘ "2: O.Q64x‘[email protected]‘3 pl. to mL fl ‘ 3’3 .23 2 i <22 '2: 2 2.2 :12 7:2 {2: 2 l k) W 22.2.... Ql-T There are mere queeilohe on the ether" side 3. (3 pie) Round the following numbers 20 three significant figures. Use scientific: netation if the answer as rounded is ambigaous. 3_52~51"v 4.4876352505 22 2 2501 22.22 25 222 523.447 5 4. (9 pts) Perform ihe foiiowing calcuia’rione and express the answer uséng the correct number of significant figures. Year fine! answer must be in scienfifie notation. $.32; 215$ 5555 ' ' 5 3 ~’ 5 , 2 ,2 '2 [(685.2 x105)=-»(8.2OD x103)}x 2.75423 = 5 2555555 «552.5 2255552255052 ‘. . 3 {$275550 3109? _.. .Méwmruw-«W‘ ,- ‘ 2 5‘" ' .5\ ;-. W 42 ‘5’\ I 55,255! / 5; 555: a 25272 .. Zz'g’gz + 38 2 5 $91 3 2"" 2 .. 22223; T @5562: 52912252.! 3’ 513T :2 2:: 515; 25' é 5’0 222‘s; 5“”‘2 {”5 5‘52 4, 2» 8635((1255 345x’108)= 2.52.22.22.25 £277 3, 2" Biié WM .04, 6.106 6.107 W09 6.,096 6.115 Dr Tatz knows the correct answer is 6.110 9. Find the average densiiy as measured ”by each Student 5:21:12. I. 55.. 5.2.2522 22:2 52:2» “:3 422 5 '5 ”“ '37 .5” 2:. .2: 5 “a ‘ {2: F 5' 8% “’ 2 .. are .V 5 3.5:”: g “2‘5 i 33% {:5} 4 W g "2 j i 5252 “I: in fig (‘4' {27¢ 5: [5e ”3”; Which student has the more accurate result? 2; ’22.: ,51255 Determine the average devietéon = 2 i ve ewe—— averagei /(raum53er 02‘ ve fees) 2 I 5 2 '2 J 5 . 3 \ ” Z N » . 52» ‘5: ‘2”: 5555:; 222:2; 2221525732725 2222:». 9.2:; 2“ ““22... 22.55.22 s v E 5 5 2 x )4 22 E {2% 2 5:12:35 a if???» "2 «9:; E 2355555“ ‘3? E “@333: ”‘2‘ EG‘Q'QNJ 5 2.2.. 532223355???» W323 ch student has the more precree result? ; . i1; «92:. EN Eff/52"”: {fiéffl i3 5’54“”:2: 5:: MM " if? {17? ff‘fiwti if“ Dr, Wysteuzii Chemistry 121 Thursday Fall 2809 Oct. 1, 2009 Quiz 1 20 minutes Name Rectnstr. Two-Digit Seetion No. Lab inst. Carmen ”3 number .un._-———u—————=—-____..__,.——_——..-—-—___.._..;.:.._u=-__..___————-..._.._._.._._.._...._____..-g..._-_______n-———-——-—_—-_————— YOU MUST SHQW ALL WORK T0 RESERVE FULL CREDIT i 1. (2 pts) What is the chemical name or symbei for each of the foiiowing eiements? Sulfur Br Sodium Pb ::‘ fl . : m ,: 2 ,3 Wig; gag" 2:32 (15:22:: 2M: 2:2: 2:: i222 :22 2,: c2222»: e 2, (2 pte) While working in the tab, you measured the following about a substance. { a. it was a ciear ceiortess iiquid. » ”“ . x 2 fl g t). It diseeived a copper penny. 2:: 2 «2 in the blanks beside each observation, piease note whether this is a physieei or a chemicai property of the material. %@L W2 . . 3. (9 pts) Comptete the foitowmg conversions: 2” 3 E :: th. : 3 ”fl : ‘2’ 23;; 6.8mm ng to pig (N225: 3:: 22:: V22“: :2 2 222212 :2 m :52: 22:22“: :2: :2: f2: 2.: 22222222222 22 2 : 222222 W {52: t “”5? ” if} ’32 *2: :52: :%‘ ,2 «2:: f it ’6 “fl “ fl f‘g :24qu J 22,22“ ' - A e :? 800.1xto6 Gt. t0 mt. 252:2: :, W: 22:: fig; :22 223‘ g 121%? f: cgfl :5: :2 :2: mg: 2:22 2:: -?/{1 €32” 2;” 2:: gaéfiafl E tiff-2:5 Veg,» 22:; 5‘ 2‘ 222$ ,: 2 g - it“ 2, 0:022 22 to 222 2222222 23:32; : :23. : m2: :: 2 :c: “:3 if?" x 3% :QE :3" u :i W e 3 22% k3 Q1219; There are mere queetiehe on the ether side “‘33:; 44..) . "4—4 4’ ‘44 “‘2 .44 3. (3 pts) Round the fotlowing numbers to three significant figures. Use scientific notation if the answer as roundee is ambigueus. 48-49325 4:44:44 9319644104 444444” 6,3G3 44:4 4. (9 pts) Perform the feitewing ceiculations and express the answer using the correct number of ss‘gnificent figures. Year fit-tat answer must be in sctehttfic notation: .4 4 4: V VV . 4W ,. W- [(285 3 x 105) (1.280 x 104)] x s 9843 .. .4 ‘ n ,. 44. V 2%1 3W": < ‘4 444.4424 44:4? 4: 4 4.344443; 14 4‘3: 4:4 4444:: V ‘4 4541;135wa ‘41 titV 3 120555-4905 38m VVVEVVVV 4 44.4. ’V‘ W VL’VEV445ZVV43 :} 1035x(521—-0456x10n.4 44 H.444»- ’ s. 414 “444,: 444442254 4—; 4, e 4 444.5424. 4 54:3”: 6 (5 pts) Two students measured the felt swing masses for a sample. 81: 8.204, 8.208, 8.206 g 32: 8.209, 8.096, 8.115 9 Dr Tetz knews the cetreet answer is 8.118 g. . Eénrj the average mess as measured by eesh student 44': w. . ’V ”V V? a V? V? V” $4.: .4444 4444.44 44 44' ”.4424 44:444..” .- 3””:35’39 V VVV 4 5V}; ' 4‘ aka‘VV 3.244 ”EVV‘V 322:: £44344 3“” 5:454 4342143 4’ $4§“Vi C4 4 {4:544 “3443} fig. V V” ‘ V V’ 44 Which student has the mete accurate tesutt? g? M434...) 4334-44. gyyfiffie 422443 5.1.4???» Determine the average deviation = E 4 value =— everegei /(number of values) V44 ,4: "W 44 4:. :74: VV“ L V3? VV “‘3’ e4 “it t: Mezifiie 4"” 54:4- .4: 4:44 Which student has them ore precise 493mg? Qt-R ...
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