Problem Set - Balancing Chemical Equations I

Name: Chemistry Period: Date: RF Mandes, PhD, NBCT

Part I Balance each chemical equation by placing the appropriate coefficient in the blank. Write the Reaction Type on the blank.

1. _2_LiBr + _1_ K2SO4  2__KBr + _1_Li2SO4 double replacement

2. _1_PBr3 + _3_NaOH  _1_P(OH)3 + _3_NaBr double replacement

3. _1_Ca(NO3)2  _1_ Ca(NO2)2 + _1_O2 decomposition

4. _2_Fe + _3_H2SO4  _1_Fe2(SO4)3 + _3_H2 single replacement

5. _4_H2S + _2_CS2  _2_CH4 + _1_S8 N/A

6. __1 N2 + _3_Mg  _1_Mg3N2 single replacement

7. _16_NiO + 1__S8  _16_Ni + _8_SO2 single replacement

8. _3_Pt + _2_Ni2(SO3)3  _3_Pt(SO3)2 + _4_Ni single replacement

9. _2_H2O2  _2_H2O + _1_O2 decomposition

10. _1_SrC2 + _2_H2O  _1_Sr(OH)2 + _2_C2H2 N/A

11. _1_OsO4 + _4_H2  _1_Os + _4_H2O single replacement

12 . _2_IrCl3 + _3_NaOH  _1_Ir2O3 + _3_HCl + _3_NaCl

Problem Set - Balancing Chemical Equations I Part II Convert the word equation into a chemical equation by writing the formula of each compound. Then balance the chemical equation. 13. iron + oxygen  iron (III) oxide

Equation: Fe + O2  Fe2O3

14. zinc + sodium chloride  zinc (II) chloride + sodium

Equation: Zn NaCl  ZnCl2 + Na

15. calcium nitrate + lithium sulfate  calcium sulfate + lithium nitrate

Equation: Ca(NO3)2 + Li2SO4  CaSO4 + LiNO3

Part III Write the word equation that corresponds to the reaction that is described. Then convert the word equation into an unbalanced chemical equation

16. When calcium is heated strongly, gas is driven off, leaving a residue of calcium oxide in the flask. Word equation: calcium carbonate → carbon dioxide + calcium oxide

Unbalanced equation: CaCO3 → CO2 + CaO

17. Solid carbonate, (NH4)2CO3, is used as the active ingredient in smelling salts. When solid ammonium carbonate is heated, it decomposes into gas, NH3, carbon dioxide gas and vapor.

Word Equation: ammonium carbonate → ammonia + carbon dioxide + water

Unbalanced equation: (NH4)2CO3 → NH3 + CO2 + H2O

18. Acetylene gas, C2H2, is often used by plumbers, welders and glass-blowers because it burns in oxygen, O2, with an intensely hot white flame. The products of the combustion of acetylene are carbon dioxide and water vapor.

Word equation: acetylene + oxygen → carbon dioxide + water vapor

Unbalanced equation: C2H2 + O2 → CO2 + H2O

19. Methanol, CH3OH, is an important industrial chemical. Methanol may be produced from the carbon monoxide gas and hydrogen gas, H2, under certain conditions of temperature and pressure.

Word equation: hydrogen + carbon monoxide → methanol

Unbalanced equation: H2 + CO → CH3OH