Download 2nd Semester Exam 1 Review Key

Review
Thiswillnotbeforadirectgradebutcompletingthisreviewwillhelpyourexamgrade.
Balancingchemicalequations
Writeoutandbalancethefollowingchemicalequations:
1) Phosphoricacid(H3PO4)decomposesintodiphosphorouspentaoxideandwater.
2H3PO4→P2O5+3H2O
Decomposition
2) Aluminummetalandoxygengasreacttoformaluminumoxide.
4Al+3O2→2Al2O3
Synthesis
3) Potassiummetalandchlorinegasreacttoformpotassiumchloride.
2K+Cl2→2KCl
Synthesis
4) Benzene(C6H6)combustswithoxygengastoyieldcarbondioxideandwater.
2C6H6+15O2→6H2O+12CO2
combustion
Typesofchemicalreactions
1) Explainall6typesofchemicalreactionsandgiveatleastoneexample.
Synthesis,Decomposition,singledisplacement,doubledisplacement,neutralization,
combustion(checkmynotesforexamplesanddescriptions)
2) Identifythetypesofreactionsinthefirst4problemsabove.
3) Defineprecipitate.Whichtypeofreactionwillalwaysproduceone?
Solidformedbysolution.Doubledisplacement.
NetIonic/CompleteIonic
Writeoutthecompleteandnetionicequations.Identifythespectatorions(theionsthatare
notreacting-theyaretheonesthatarecrossedoutinyourcompleteionicequation)
1) Mg(NO3)2(aq)+Na2CO3(aq)→MgCO3(s)+2NaNO3(aq)
Mg2+(aq)+2NO3-(aq)+2Na+(aq)+CO3-(aq)→MgCO3(s)+2Na+(aq)+2NO3-(aq)
Mg2+(aq)+CO3-(aq)→MgCO3(s)
2) SrBr2(aq)+K2SO4(aq)→SrSO4(s)+2KBr(aq)
Sr2+aq)+2Br-(aq)+2K+(aq)+SO4-(aq)→SrSO4(s)+2K+(aq)+2Br-(aq)
Sr2+aq)+SO4-(aq)→SrSO4(s)
3) 2CoBr3(aq)+3K2S(aq)→Co2S3(s)+6KBr(aq)
2Co3+(aq)+6Br-(aq)+6K+(aq)+3S2-(aq)→Co2S3(s)+6K+(aq)+6Br-(aq)
2Co3+(aq)+3S2-(aq)→Co2S3(s)
Review
4) 3Ba(NO3)2(aq)+2(NH4)3PO4(aq)→Ba3(PO4)2(s)+6NH4NO3(aq)
3Ba2+(aq)+6NO3-(aq)+6NH4+(aq)+2PO42-(aq)→Ba3(PO4)2(s)+6NH4+(aq)+6NO3-(aq)
3Ba2+(aq)+2PO42-(aq)→Ba3(PO4)2(s)
5) AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)
Ag+(aq)+NO3-(aq)+Na+(aq)+Cl-(aq)→AgCl(s)+Na+(aq)+NO3-(aq)
Ag+(aq)+Cl-(aq)→AgCl(s)
6) Pb(NO3)2(aq)+2NaCl(aq)→PbCl2(s)+2NaNO3(aq)
Pb2+(aq)+2NO3-(aq)+2Na+(aq)+2Cl-(aq)→PbCl2(s)+2Na+(aq)+2NO3-(aq)
Pb2+(aq)+2Cl-(aq)→PbCl2(s)
7) NaOH(aq)+HCl(aq)→H2O(l)+NaCl(aq)
Na+(aq)+OH-(aq)+H+(aq)+Cl-(aq)→H2O(l)+Na+(aq)+Cl-(aq)
OH-(aq)+H+(aq)→H2O(l)
MolarMass
Findthemolarmassforthefollowingcompounds:
1) 151.9g/molFeSO4
2) 119.98g/molCaBr2
3) 58.443g/molNaCl
4) 212.994g/molAl(NO3)3
Moles
Convertthefollowingfrommolestograms:
1) 350.658gNaCl
2) 284.44gNaCl
3) 563.914gH2SO4
Convertthefollowingfromgramstomoles:
1) 13.87molCa
Convertthefollowingfrommolestomolecules/atoms
1) 3.91x1024moleculesC6H12O6
2) 3.01x1024moleculeswater
Convertthefollowingfrommolecules/atomstomoles
1) 9.43x10-24atomsAg