Problem Set 4.2: Types of Reactions Complete each equation by writing each balancing coefficient. Each blank should have a whole number! State the type of each reaction.

Practice Questions: Balance the following equations by writing in the simplest whole number coefficient in the space provided. Identify the reaction type on the right.

Write / Balance:	Type:
1. 4 Al (s) + 3 O2 (g) à 2 Al2O3 (s)	Synthesis
2. 2 HCl (aq) + 1 Ca(OH)2 (aq) à 2 HOH (l) + 1 CaCl2 (aq)	Neut
3. 1 CH4 (g) + 2 O2 (g) à 1 CO2 (g) + 2 H2O (g)	Combustion
4. 1 Zn (s) + 1 Pb(CH3COO)2 (aq) à 1 Pb (s) + 1 Zn(CH3COO)2 (aq)	SR
5. 1 SO3 (g) + 1 H2O (l) à 1 H2SO4 (aq)	Synthesis
6. 2 HgO (s) à 2 Hg (l) + 1 O2 (g)	Decomp
7. 1 CaCO3 (s) à 1 CaO (s) + 1 CO2 (g)	Decomp
8. 2 NaI (aq) + 1 Pb(NO3)2 (aq) à 1 PbI2 (s) + 2 NaNO3 (aq)	DR
9. 1 Cl2 (aq) + 2 NaI (aq) à 1 I2 (aq) + 2 NaCl (aq)	SR
10. 1 Al2(SO4)3 (aq) + 3 Ca(OH)2 (aq) à 2 Al(OH)3 (s) + 3 CaSO4 (s)	DR
11. 1 Al2(SO4)3 (aq)+ 3 Ca(HCO3)2 (aq)à 2 Al(OH)3 (s)+ 3 CaSO4 (s)+ 6 CO2 (g)	Other
For the following, predict the products based on the common reaction types. Balance the equation and write the reaction type.
Predict, Write and Balance	Reaction type
12. __2_ C8H18 (l) + __25_ O2 (g) à 16 CO2 (g) + 18 H2O (g)	Combustion
13. __2_ H2O (l) à 2 H2 (g) + O2 (g)	Decomp
14. __2_ Na (s) + __1_ Cl2 (g) à 2 NaCl (s)	Synthesis
15. __1_ Ca (s) + __2_ HOH (l) à Ca(OH)2 (s) + H2 (g)	SR
16. __3_ H2SO4 (aq) + __2_ Al(OH)3 (s) à 6 H2O (l) + Al2(SO4)3 (aq)	Neut
17. __1_ Cl2 (aq) + __2_ KBr (aq) à 2 KCl (aq) + Br2 (aq)	SR
18. __1_ Na2CO3 (aq) + __1_ Ca(OH)2 (aq) à 2 NaOH (aq) + CaCO3 (s)	DR
Write the equation from the sentence and balance.
Predict, Write and Balance	Reaction type
19. Solid sodium nitrate and solid sodium metal react to form solid sodium oxide and nitrogen gas. 2 NaNO3 (s) + 10 Na (s) à 6 Na2O (s) + N2 (g)	Other
20. Calcium hydride and water form hydrogen and calcium hydroxide. CaH2 (s) + H2O (l) à Ca(OH)2 (s) + H2 (g)	Other
21. Xenon hexafluoride reacts violently with water to form xenon trioxide and hydrogen fluoride. XeF6 (g) + 3 H2O (l) à XeO3 (s) + 6 HF (g)	Other
22. Barium chloride dihydrate and silver oxide react to produce silver chloride, solid barium oxide, and water. BaCl2•2H2O (s) + Ag2O (s) à 2 AgCl (s) + BaO (s) + 2 H2O (l)	Other
23. A Bunsen burner, gas furnace and gas hot-water tank all burn natural gas. __1_CH4 (g) + __2_O2 (g) à CO2 (g) + 2 H2O (g)	Combustion

24. Propane is used as a fuel for trailers and where natural gas is not available. __1_ C3H8 (g) + __5_O2 (g) à 3 CO2 (g) + 4 H2O (g)	Combustion
25. Oxygen gas may be produced in the laboratory by heating potassium chlorate. __2_ KClO3 (s) à 2 KCl (s) + 3 O2 (g)	Decomp
26. Limestone mined in Alberta is decomposed by heating to produce lime. __1_ CaCO3 (s) à __1_ CaO (s) + __1_ CO2 (g)	Decomp
27. Liquid decane is mixed with air in the carburetor and then exploded by a spark in the cylinder of a car motor. __2_ C10H22 (l) + __31_ O2 (g) à 20 CO2 (g) + 22 H2O (g)	Combustion
28. A rock may be tested for limestone content by adding hydrochloric acid. __1_ CaCO3 (s) + __2_ HCl (aq) à __1_ CaCl2 (aq) + __1_ H2O (l) + __1_ CO2 (g)	Other
29. A candle (assume C25H52) is burned for emergency or dining light. C25H52 (s) + 38 O2 (g) à 25 CO2 (g) + 26 H2O (g)	Combustion
MORE GENERAL PRACTICE QUESTIONS:
Predict, Write and Balance	Reaction type
1. __2_ Na + __1_ ZnI2 à __2_ NaI + __1_ Zn	SR
2. __1_ HBrO3 + __5_ HBr à __3_ H2O + __3_ Br2	Other
3. __1_ Al4C3 + __12_ H2O à __4_ Al(OH)3 + __3_ CH4	Other
4. __2_ Ca(NO3)2·3H2O + __3_ LaC2 à __2_ Ca(NO3)2 + __3_ La(OH)2 + _3_ C2H2	Other
5. __1_ CH3NO2 + __3_ Cl2 à __1_ CCl3NO2 + __3_ HCl	Other
6. __2_ Ca3(PO4)2 + __6_ SiO2 + __10_ C à __6_ CaSiO3 + __10_ CO + __1_ P4	Other
7. __2_ Cu (s) + __1_ O2 (g) à 2 CuO (s)	Synthesis
8. __3_ Fe (s) + __4_ H2O (g) à __4__ H2 (g) + __1_ Fe3O4 (s)	SR
9. __2_ CrCl3 (aq) + __3_ H2S (aq) à Cr2S3 (s) + 6 HCl (aq)	DR
10. __1_ CuSO4·5H2O (s) à __1_ CuSO4 (s) + __5_ H2O (g)	Decomp
11. __16_ Fe (s) + __3_ S8 (s) à 8 Fe2S3 (s)	Synthesis
12. __1_ H2S (aq) + __2_ KOH (aq) à K2S (aq) + 2 H2O (l)	Neut
13. __2_ NaF (l) à 2 Na (s) + F2 (g)	Decomp
14. __2_ Al (s) + __3_ H2SO4 (aq) à __3__ H2 (g) + __1_ Al2(SO4)3 (aq)	SR
15. __1_ H3PO4 (aq) + __3_ NH4OH (aq) à (NH4)3PO4 (aq) + 3 H2O (l)	Neut
16. __1_ C3H8 (g) + __5_ O2 (g) à 3 CO2 (g) + 4 H2O (g)	Combustion
17. __4_ Al (s) + __3_ O2 (g) à 2 Al2O3 (s)	Synthesis
18. __2_ C14H30 (s) + __43_ O2 (g) à 28 CO2 (g) + 30 H2O (g)	Combustion
MIND BENDERS (Challenge for Chem. nuts!):
Predict, Write and Balance	Reaction type
1. 3 Cu + 8 HNO3 à 3 Cu(NO3)2 + 2 NO + 4 H2O	Other
2. 3 FeCl2 + 1 KNO3 + 4 HCl à 3 FeCl3 + 1 NO + 2 H2O + 1 KCl	Other
3. 2 KMnO4 + 16 HBr à 2 MnBr2 + 5 Br2 + 2 KBr + 8 H2O	Other
4. 1 K2Cr2O7 + 14 HCl à 2 KCl + 2 CrCl3 + 7 H2O + 3 Cl2	Other