Chemistry*120* * Name:! Rio*Hondo*College* * * EXAMPLE*EXAM*1*!

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1 Chemistry*120* * Name: EXAMPLE*EXAM*1* Exam)#1 100)points) Directions:)Answereachquestionbelowtothebestofyourability.Showallworkwherecalculations arerequired.aninformationsheetwithaperiodictableisattachedtothebackoftheexam;youmay removeitifyouwish. 1. (10)Completethetablebelowbyprovidingasymbolforthegivenelement,ortheelementforthegiven symbol. Symbol) Element)Name) ) Element)Name) Symbol) Mg oxygen H mercury Ba bromine Cu strontium Fe nitrogen Sn chromium Bi zinc Pb rubidium He titanium 2. (4)Carryoutthefollowingcalculations.Reportyouranswerwiththecorrectnumberofsignificant figures ( )+2.13= 2.53% % = 3. (3)Whatarethestatesofeachofthefollowingelementsatroomtemperature?Answersforsolid,lfor liquid,andgforgas. Al Ca Ne Na Hg F 1

2 Chemistry*120* * 4. Converteachofthefollowingmeasurementstotheindicatedunits.Expresseachanswerwiththe correctunitsandnumberofsignificantfigures.showallunitsinyourwork(26points) a.4.52milliliterstomicroliters b.31.1centimeterstoyards c.10.00yearstomilliseconds d.16.0quartsperminutestomillimeterspersecond e.9.8squareyards(yd 2 )tosquaredecimeters(dm 2 ) 5. (5)Labeleachofthefollowingas(a)anelement,(b)acompound,(c)ahomogeneousmixture,or(d)a heterogeneousmixture. saltwater air purewater pizza potassium 2

3 Chemistry*120* * Completethefollowingtable.Assumethateachatomisneutralunlessotherwiseindicated.(10points) Complete Symbol Number of Protons Number of Neutrons Number of Electrons 49 Mn 44 Ca For the problem below, assume that this is an ion with 1- charge rectreading(includingunits)foreachpieceofequipmentshowninthefigures.(2pointseach) temperature: lengthofline: volumereading: volumereading: 7. G i v e t h e c o r o C ml 3

4 Chemistry*120* * 8. Ethyleneglycol(antifreeze)hasadensityof1.11g/mL. a.(3)whatisthemassingramsof280.mlofthisliquid? b.(5)whatisthevolumeinlitersof4.55kgofthisliquid? 9. (8)50.0mLofmaplesyruphasamassof96.5grams.Howmanypoundsofsyruparethereina barrelwhichholds20.gallonsofmaplesyrup? 10. (4)Indicatewhethereachofthefollowingaphysicalchange(P)orachemicalchange(C). Waterisfrozentomakeicecubes. Liquidpropaneignitesandburns. Glassshattersontheground. Spilledgasolineevaporates. 4

5 Chemistry*120* * 11. (8)Themineralransomiteis16.73%ironbymass.Ransomitehasadensityof2.63g/cm 3.How manymilligramsofironarecontainedinacubeofransomitemeasuring3.00inchesonaside? 12. (6)Lithiumhastwonaturallyoccurringisotopes. 6 Liaccountsfor7.59%ofalllithium,andhas atomicmass amu. 7 Li,whichaccountstherest,hasatomicmass amu.Whatisthe atomicmassoflithium?giveyouranswertothreedecimalplaces. 5

6 Chemistry*120* * 6 Conversion)Factors):) 1pound=453.6g 1amu= c24 grams 1yard=3feet 1meter=1.094yards 1mile=1.609km 1L=1.057quart 1gallon=4quarts 1quart=2pints 1cal=4.184J ))))Periodic)Table) 1 1A 18 8A 1 1 H A 13 3A 14 4A 15 5A 16 6A 17 7A 2 He Li Be B C N O F Ne Na Mg B 4 4B 5 5B 6 6B 7 7B 8 8B 9 8B 10 8B 11 1B 12 2B 13 Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc (98) 44 Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po (209) 85 At (210) 86 Rn (222) 7 87 Fr (223) 88 Ra (226) 89 Ac (227) 104 Rf (263) 105 Db (262) 106 Sg (266) 107 Bh (264) 108 Hs (269) 109 Mt (268) 110 Ds (272) 111 Rg (272) 58 Ce Pr Nd Pm (145) 62 Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np (237) 94 Pu (244) 95 Am (243) 96 Cm (247) 97 Bk (247) 98 Cf (251) 99 Es (252) 100 Fm (257) 101 Md (258) 102 No (259) 103 Lr (262) )