1. DOUBLE REPLACEMENT reactants trade partners cation (+) from one compound combines with the anion (-) in the other compound and vice versa

2. DOUBLE REPLACEMENT Solns of lead(II)nitrate and potassium iodide combine to form a precipitate of lead(II)iodide and potassium nitrate. precipitate = SOLID KNO 3(aq) +PbI 2(s) →KI (aq) + Pb(NO 3 ) 2(aq) 2 2

3. DOUBLE REPLACEMENT To determine precipitates: MUST USE THE SOLUBILITY RULES Silver nitrate is combined with sodium chloride: AgNO 3(aq) + NaCl (aq) →AgCl (s) +NaNO 3(aq)

4. DOUBLE REPLACEMENT Sodium sulfate soln is mixed with barium nitrate soln: Na 2 SO 4(aq) + Ba(NO 3 ) 2(aq) → NaNO 3(aq) + BaSO 4(s) 2

5. COMBUSTION OF A HYDROCARBON hydrocarbon - has C, H (and O) combustion is reaction with oxygen: O 2(g) must be a reactant! complete combustion ALWAYS produces CO 2 + H 2 O incomplete – will also yield CO

6. COMBUSTION OF A HYDROCARBON combustion of ethane, C 3 H 8(g) : C 3 H 8(g) +5O 2(g) → 3CO 2(g) + 4H 2 O (g) combustion of octane, C 8 H 18( l ) : 2C 8 H 18( l ) + 25 O 2(g) → 16CO 2(g) + 18 H 2 O (g)

7. COMBUSTION OF A HYDROCARBON combustion of acetylene, C 2 H 2(g) : 2C 2 H 2(g) + 5 O 2(g) → 4 CO 2(g) + 2H 2 O (g)

8. 10) SiCl 4 + 2 Mg → Si + 2 MgCl 2 11) Ca(OH) 2 + 2 HNO 3 → Ca(NO 3 ) 2 + 2 H 2 O 12a) Sb 2 S 3 + 3 Fe → 2 Sb + 3 FeS 12b) Sb 4 O 6 + 3 C → 4 Sb + 3 CO 2 13) 3 KOH + Fe(NO 3 ) 3 → Fe(OH) 3 + 3 KNO 3 14) 2 HCl + Pb(NO 3 ) 2 → PbCl 2 + 2 HNO 3 15) K 2 CrO 4 + Ba(NO 3 ) 2 → BaCrO 4 + 2 KNO 3 17) 2 Al ( l ) + 3 BaO → Al 2 O 3 + 3 Ba ( l ) 18) Ca (s) + 2 H 2 O ( l ) → Ca(OH) 2 + H 2(g) 19) 2 C 4 H 10 + 13 O 2(g) → 8 CO 2(g) +10 H 2 O ( l )