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Unit 7: Balancing Chemical Reactions- Worksheet 2

Balance the following equations by inserting the proper coefficients.

1. _2__SO2 + _1__O2 ( _2__SO3

2. _2__CH4 + _3__O2 ( _2_CO + _4__H2O

3. _2__P + __3_Cl2 ( __2_PCl3

4. _2__CO + _1__O2 ( _2__CO2

5. _2_CH4 + _1_ O2 ( _2__CH3OH

6. _2__Li + _1__Br2 ( _2_LiBr

7. _2_Al2O3 ( __4_Al + _3_O2

8. _2__Na + __2_H2O ( _2_NaOH + _1__H2

9. _6__CO2 + _6__H2O ( __1_C6H12O6 + _6_O2

10. _1__H2SO4 + _2_NaCl ( _2_HCl + _1_Na2SO4

Two reactions used to get rid of sulfur dioxide, a pollutant from burning coal:

11. _3__H2 + _1_SO2 ( _1_H2S + _2_H2O

12. _2_CaCO3 + _2_SO2 + _1_ O2 ( _2_CaSO4 + _2_CO2

13. _2_AgNO3 + _1_CaCl2 ( _2_AgCl + _1_Ca(NO3)2

14. _2_HCl + _1_Ba(OH)2 ( _1_BaCl2 + _2_H2O

15. _1_H3PO4 + _3_NaOH ( _1_Na3PO4 + _3_H2O

16. _1_Pb(NO3)2 + _2_KI ( _1_ PbI2 + _2_KNO3

17. _3_CuO + _2_NH3 ( _1_N2 + _3_Cu + _3_H2O

18. _1_C2H5OH + _3_O2 ( _2_CO2 + _3_H2O

19. _2_C2H6 + _3_O2 ( _2_CH3COOH + _2 H2O

20. _3_NO2 + _1_H2O ( _2_HNO3 + _1_NO

Write the formulas of the reactants and products - including the symbols for the state - (s), (l), (g), (aq) - then balance the equations.

1. When a solution of hydrogen chloride is added to solid sodium bicarbonate (NaHCO3), the products are carbon dioxide, water and aqueous sodium chloride.

HCl(aq) + NaHCO3(s) ( CO2(g) + H2O(l) + NaCl(aq)

2. Steam (gaseous water) reacts with carbon at high temperatures to produces carbon monoxide and hydrogen gases.

H2O(g) + C(s) ( CO(g) + H2(g)

3. Limestone, CaCO3, decomposes when heated to produce lime, CaO, and gaseous carbon dioxide.

CaCO3(s) ( CaO(s) + COs(g)

4. Ethyl alcohol (a liquid), C2H6O, burns in air to produce carbon dioxide and gaseous water.

C2H6O(l) + 3 O2(g) ( 2 CO2(g) + 3 H2O(l)

5. Solid titanium (IV) chloride reacts with water, forming solid titanium (IV) oxide and aqueous hydrogen chloride.

TiCl4(s) + 2 H2O(l) ( TiO2(s) + 4 HCl(aq)

6. At high temperatures, the gases chlorine and water react to produce hydrogen chloride and oxygen gases.

2 Cl2(g) + 2 H2O(g) ( 4 HCl(g) + O2(g)

7. Steel wool (nearly pure Fe) burns in air to form the solid iron oxide, Fe2O3.

4 Fe(s) + 3 O2(g) ( 2 Fe2O3(s)

8. During photosynthesis in plants, carbon dioxide and water are converted into glucose, C6H12O6, and oxygen gas.

6 CO2(g) + 6 H2O(g) ( C6H12O6(s) + 6 O2(g)

9. Solutions of calcium hydroxide, Ca(OH)2 and nitric acid, HNO3, react to produce water and aqueous calcium nitrate, Ca(NO3)2.

Ca(OH)2(aq) + 2 HNO3(aq) ( 2 H2O(l) + Ca(NO3)2(aq)

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