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Name ________________ Balancing Chemical Equations Date:_________________ 1. A balanced equation representing a chemical reaction can be written using 1) chemical formulas and mass numbers 2) chemical formulas and coefficients 3) first ionization energies and mass numbers 4) first ionization energies and coefficients 2. Which equation is correctly balanced? 1) 2) 3) 4) CaO + 2H2O ® Ca(OH) 2 NH 3 + 2O2 ® HNO 3 + H2O Ca(OH) 2 + 2H3PO 4 ® Ca3(PO4) 2 + 3H2O Cu + H 2SO 4 ® CuSO 4 + H2O + SO 2 3. Which chemical equation is correctly balanced? 1) H2(g) + O 2(g) ® H2O(g) 2) N2(g) + H 2(g) ® NH 3(g) 3) 2NaCl(s) ® Na(s) + Cl2(g) 4) 2KCl(s) ® 2K(s) + Cl 2(g) 4. Given the unbalanced equation: __Na + __H2O ® __H2 + __NaOH When the equation is correctly balanced using the smallest whole-number coefficients, the coefficient for H2 O is 1) 1 2) 2 3) 3 4) 4 5. Given the unbalanced equation: __Fe 2O3 + __CO __Fe + __CO 2 When the equation is correctly balanced using the smallest whole-number coefficients, what is the coefficient of CO? 1) 1 2) 2 3) 3 4) 4 6. Given the unbalanced equation: __Mg(ClO3)2(s) ® __MgCl2(s) + __O2(g) What is the coefficient of O2 when the equation is balanced correctly using the smallest whole number coefficients? 1) 1 2) 2 3) 3 4) 4 7. Given the unbalanced equation: __ Al(s) + __O2(g) ® __Al2O3(s) When this equation is correctly balanced using smallest whole numbers, what is the coefficient of O2(g)? 1) 6 2) 2 3) 3 4) 4 Chemistry! Balancing Chemical Equations 8. Given the unbalanced equation: ___N2(g) + ___ O2(g) ___ N2O5(g) When the equation is balanced using smallest whole numbers, the coefficient of N2(g) will be 1) 1 2) 2 3) 5 4) 4 9. Given the unbalanced equation: NaOH + H3PO4 ® Na3PO4 + H2O When the equation is correctly balanced, the coefficient of H2O will be 1) 1 2) 2 3) 3 4) 4 10. When the equation __ C2H4 + __ O2 ® __ CO2 + __ H2O is balanced using smallest whole numbers, what is the coefficient of the O2? 1) 1 2) 2 3) 3 4) 4 11. Given the unbalanced equation: __Al2(SO4)3 + __Ca(OH)2 ® __Al(OH)3 + __CaSO4 When the equation is completely balanced using the smallest whole number coefficients the sum of the coefficients is 1) 5 2) 9 3) 3 4) 4 Chemistry! Answer Key Balancing Equations 1. 2 2. 2 3. 4 4. 2 5. 3 6. 3 7. 3 8. 2 9. 3 10. 3 11. 2 Chemistry!