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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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