DOUBLE REPLACEMENT

reactants trade partnerscation (+) from one compound

combines with the anion (-) in the other compound and vice versa

DOUBLE REPLACEMENT

Solns of lead(II)nitrate and potassium iodide combine to form a precipitate of lead(II)iodide and potassium nitrate.

precipitate = SOLIDKNO3(aq)+PbI2(s)→KI(aq)+Pb(NO3)2(aq) 22

DOUBLE REPLACEMENT

To determine precipitates: MUST USE THE SOLUBILITY RULES

Silver nitrate is combined with sodium chloride:

AgNO3(aq)+ NaCl(aq)→AgCl(s)+NaNO3(aq)

DOUBLE REPLACEMENT

Sodium sulfate soln is mixed with barium nitrate soln:

Na2SO4(aq) + Ba(NO3)2(aq) →

NaNO3(aq) + BaSO4(s)

2

COMBUSTION OF A HYDROCARBONhydrocarbon - has C, H (and O)combustion is reaction with

oxygen: O2(g) must be a reactant!complete combustion ALWAYS

produces CO2 + H2O incomplete – will also yield CO

COMBUSTION OF A HYDROCARBON

combustion of ethane, C3H8(g):

C3H8(g) +5O2(g) → 3CO2(g) + 4H2O(g)

combustion of octane, C8H18(l):

2C8H18(l) + 25 O2(g)→

16CO2(g) + 18 H2O(g)

COMBUSTION OF A HYDROCARBON

combustion of acetylene, C2H2(g):

2C2H2(g)+ 5 O2(g)→ 4 CO2(g) + 2H2O(g)

10) SiCl4 + 2 Mg → Si + 2 MgCl2

11) Ca(OH)2 + 2 HNO3 → Ca(NO3)2 + 2 H2O

12a) Sb2S3 + 3 Fe → 2 Sb + 3 FeS

12b) Sb4 O6 + 3 C → 4 Sb + 3 CO2

13) 3 KOH + Fe(NO3)3 → Fe(OH)3 + 3 KNO3

14) 2 HCl + Pb(NO3)2 → PbCl2 + 2 HNO3

15) K2CrO4 + Ba(NO3)2 → BaCrO4 + 2 KNO3

17) 2 Al(l) + 3 BaO → Al2O3 + 3 Ba(l)

18) Ca(s) + 2 H2O(l) → Ca(OH)2 + H2(g)

19) 2 C4H10 + 13 O2(g)→ 8 CO2(g)+10 H2O(l)