Worksheet: Balancing Chemical Equations

In this worksheet, we will practice balancing chemical equations and the shortcuts that can be made when balancing multiatom groups.

Q1:

Write a balanced molecular equation for the reaction of aluminum with oxygen.

  • A4Al+3O2AlO223
  • BAl+OAlO22
  • CAl+OAlO
  • D2Al+O2AlO2
  • E2Al+3OAlO23

Q2:

Write a balanced molecular equation for the reaction of silicon dioxide with hydrogen fluoride.

  • ASiO+4HFSi+2F+2HO222
  • B2SiO+2HF2SiF+HO22
  • CSiO+2HFSi+F+HO22
  • D2SiO+4HF2SiF+3HO242
  • ESiO+4HFSiF+2HO242

Q3:

Write a balanced molecular equation for the reaction of water with sodium metal.

  • ANa+2HONaOH+2H22
  • B3Na+3HO3NaOH+2H22
  • C2Na+HO2NaOH+2H22
  • D2Na+2HO2NaOH+H22
  • ENa+HONaOH+H22

Q4:

Write a balanced molecular equation for the reaction of magnesium with oxygen.

  • AMg+2OMgO2
  • B2Mg+O2MgO22
  • CMg+OMgO22
  • DMg+OMgO
  • E2Mg+O2MgO2

Q5:

Which of the following is a balanced chemical equation?

  • A2Na+2HO2NaOH+H22
  • B2Na+HO2NaOH+H22
  • CNa+2HONaOH+2H22
  • DNa+HONaOH+H22
  • ENa+2HONaOH+H22

Q6:

Which of the following is a balanced chemical equation?

  • A8Fe+4O4FeO223
  • B4Fe+2O2FeO223
  • C2Fe+OFeO223
  • D4Fe+3O2FeO223
  • E8Fe+5O4FeO223

Q7:

Give a balanced chemical equation for the reaction of hydrogen and iodine to form hydrogen iodide.

  • AH+IHI22
  • BH+2I2HI22
  • C2H+I4HI22
  • DH+I2HI22
  • E2H+I2HI22

Q8:

Which of the following is a balanced chemical equation?

  • A3Cu+8HNO3Cu(NO)+4HO+2NO3322
  • BCu+4HNOCu(NO)+2HO+2NO3322
  • C2Cu+6HNO2Cu(NO)+3HO+2NO3322
  • D3Cu+10HNO3Cu(NO)+5HO+4NO3322

Q9:

Which of the following is a balanced chemical equation?

  • A2PtClPt++2Cl42
  • B2PtClPt++4Cl42
  • CPtClPt++4Cl42
  • DPtCl2Pt++2Cl42
  • EPtClPt++2Cl42

Q10:

Which of the following is a balanced chemical equation?

  • AP+3Cl4PCl423
  • BP+6Cl2PCl423
  • CP+6Cl4PCl423
  • DP+4Cl2PCl423
  • EP+5Cl4PCl423

Q11:

Which of the following is a balanced chemical equation?

  • A2(NH)CrO2CrO+2N+5HO42272322
  • B(NH)CrOCrO+N+4HO42272322
  • C(NH)CrO2CrO+2N+4HO42272322
  • D2(NH)CrO2CrO+N+8HO42272322
  • E(NH)CrO2CrO+2N+3HO42272322

Q12:

Write a balanced molecular equation for the complete reaction of phosphoric acid with sodium hydroxide.

  • AHPO+2NaOHNaPO+2HO24242
  • BHPO+NaOHNaPO+2HO3442
  • CHPO+NaOHNaPO+2HO3332
  • DHPO+3NaOHNaPO+3HO33332
  • EHPO+3NaOHNaPO+3HO34342

Q13:

Write a balanced molecular equation for the complete combustion of butane.

  • ACH+6O4CO+4HO410222
  • B2CH+15O8CO+14HO410222
  • C2CH+13O8CO+10HO410222
  • D2CH+11O8CO+6HO410222
  • ECH+6O4CO+5HO410222

Q14:

Write a balanced molecular equation describing the thermal decomposition of calcium carbonate.

  • ACa(CO)CaO+2CO3222
  • B2CaCO2CaO+CO32
  • CCa(CO)CaO+4CO322
  • DCaCOCaO+CO3
  • ECaCOCaO+CO32

Q15:

Which of the following is a balanced chemical equation?

  • A2CHOH+3O2CO+2HO3222
  • B2CHOH+4O2CO+3HO3222
  • CCHOH+2OCO+2HO3222
  • DCHOH+OCO+2HO3222
  • E2CHOH+3O2CO+4HO3222

Q16:

Which of the following is a balanced chemical equation?

  • APCl+2HOPOCl+4HCl523
  • B2PCl+HO2POCl+4HCl523
  • CPCl+3HOPOCl+HCl523
  • DPCl+HOPOCl+4HCl523
  • EPCl+HOPOCl+2HCl523

Q17:

Ammonium nitrate is produced from nitrogen in two reaction steps.

Write a balanced molecular equation for the first step, a reduction–oxidation reaction.

  • A2N+6HO4NH+3O2232
  • BN+6HCl2NH+3Cl232
  • CN+3H2NH223
  • DN+3HS2NH+S223
  • EN+3HO2NH+3O22232

Write a balanced molecular equation for the second step, an acid–base reaction.

  • ANH+HNONHNO3242
  • BNH+HNONHNO3343
  • C2NH+6NaOHNHNO+3NaO+4H34322
  • D2NH+2HONHNO+3H32422
  • ENH+NaNO+HONHNO+NaOH33243

Q18:

Gallium(III) bromide can be produced by the reaction of gallium with bromine. Write a balanced molecular equation for this reaction, including state symbols.

  • AGa()+Br()GaBr()lls22
  • B4Ga()+3Br()2GaBr()lls223
  • C3Ga()+4Br()3GaBr()lls23
  • D2Ga()+3Br()2GaBr()lls23
  • E6Ga()+4Br()3GaBr()lll223

Q19:

The appearance of fireworks often results from the decomposition of barium nitrate or potassium chlorate.

Write a balanced equation for the decomposition of barium nitrate into barium oxide, nitrogen, and oxygen.

  • A4BaNO2BaO+4N+5O322
  • B2Ba(NO)2BaO+2N+5O3222
  • CBa(NO)BaO+N+3O3222
  • D2BaNOBaO+N+3O3222
  • E2Ba(NO)2BaO+4N+6O322

Write a balanced equation for the decomposition of potassium chlorate into potassium chloride and oxygen.

  • A3KClO3KCl+2O2
  • B2KClO2KCl+O2
  • C2KClO4KCl+3O2232
  • D2KClO2KCl+3O32
  • E3KClO3KCl+4O32

Q20:

Which of the following is a balanced chemical equation?

  • A3N+5O3NO2225
  • B2N+5O2NO2225
  • C3N+7O3NO2225
  • D2N+3O2NO2225
  • EN+3ONO2225

Q21:

Which of the following is a balanced chemical equation?

  • ANHNON+O+2HO43222
  • B2NHNON+O+4HO43222
  • CNHNON+3O+HO43222
  • D2NHNO2N+3O+2HO43222
  • E2NHNO2N+O+4HO43222

Q22:

Write a balanced chemical equation, including state symbols, for the electrolysis of molten potassium iodide at 700C.

  • A2KI()2K()+I().lls2
  • B2KI()2K()+I().lsg2
  • C2KI()2K()+I().llg2
  • DKI()K()+I().lsg
  • EKI()K()+I().lss

Q23:

What is the balanced chemical equation for the complete combustion of hydrazine (NH)24? One product is nitrogen.

  • ANH+ON+2HO24222
  • BNH+ON+HO24222
  • CNH+O2N+2HO2422
  • DNH+2ON+4HO24222
  • ENH+O2N+HO2422

Q24:

What is the balanced chemical equation for the complete combustion of methane (CH)4?

  • A2CH+3O2CO+4HO422
  • BCH+2OCO+HO4222
  • CCH+2OCO+2HO4222
  • DCH+OCO+2HO4222
  • E3CH+5OCO+2CO+6HO4222

Q25:

Which of the following is not a balanced chemical equation?

  • A3HClOHClO+HO+2ClO3422
  • B3HClOHClO+HO+Cl+2O34222
  • C8HClO4HClO+2HO+2ClO+Cl+O342222
  • D2HClOHO+Cl+2O3222
  • E5HClO3HClO+HO+Cl+O34222

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