WorksheetCloud: WORKSHEET Grade: 9 Subject: Natural Sciences Topic: Balancing Equations ACTIVITY 1: Balance the following equations. 1. HgO → Hg + O2 2. KCℓO3 → KCℓ + O2 3. SO2 + O2 → SO3 4. Li + O2 → Li2O 5. NaNO3→ NaNO2 + O2 6. N2 + H2 → NH3 7. HNO3 → H2O + NO2 + O2 8. ZnS + O2 → ZnO + SO2 9. P b + C → Pb + CO2 10. N H3 + O2 → N2 + H2O 11. s odium + chlorine → sodium chloride 12. HgO → mercury + oxygen Activity: Balance the following equations. 1. 2HgO → 2Hg + 2. 2KCℓO3 → 2KCℓ + O2 3O2 3. 2SO2 + O2 → 2SO3 4. 4Li + O2 → 2Li2O 5. 2NaNO3 → 2NaNO2 + O2 6. N2 + 3H2 → 2NH3 7. 4HNO3 → 2H2O + 4N O2 + O2 8. 2ZnS + 3O2 → 2ZnO + 2SO2 9. 2 PbO + C → 2Pb + CO2 10. 4NH3 + 3O2 → 2N2 + 6H2 O 11. S odium + chlorine à sodium chloride 2Na + Cl2 → 2NaCl 12. HgO à mercury + oxygen 2HgO → 2Hg + O2 Balancing Equations: Practice Problems 1. Balance each of the following equations. (a) Fe + Cl2 −−→ FeCl3 (b) Fe + O2 −− → Fe2 O3 (c) FeBr3 + (d) C4 H6 O3 + (e) C2 H4 + (f) C4 H10 O + (g) C7 H16 + (h) H2 SiCl2 + (i) HSiCl3 + (j) C7 H9 + (k) C5 H8 O2 + H2 SO4 −− → H2 O − −→ O2 −− → O2 −− → O2 −−→ H2 O −− → H2 O − −→ HNO3 −−→ NaH + Fe2 (SO4 )3 + HBr C2 H4 O2 CO2 + H2 O CO2 + CO2 + H2 O H2 O H8 Si4 O4 + HCl H10 Si10 O15 + HCl C7 H6 (NO2 )3 + HCl − −→ H2 O C5 H12 O2 + NaCl Balancing Equations: Answers to Practice Problems 1. Balanced equations. (Coefficients equal to one (1) do not need to be shown in your answers). (a) 2 Fe + 3 Cl2 − −→ 2 FeCl3 (b) 4 Fe + 3 O2 −−→ 2 Fe2 O3 (c) 2 FeBr3 + 3 H2 SO4 −− → 1 Fe2 (SO4 )3 + 6 HBr (d) 1 C4 H6 O3 + 1 H2 O −− → 2 C2 H4 O2 (e) 1 C2 H4 + 3 O2 − −→ 2 CO2 + 2 H2 O (f) 1 C4 H10 O + 6 O2 −−→ 4 CO2 + 5 H2 O (g) 1 C7 H16 + 11 O2 −− → 7 CO2 + 8 H2 O (h) 4 H2 SiCl2 + 4 H2 O −− → 1 H8 Si4 O4 + 8 HCl (i) 10 HSiCl3 + 15 H2 O −− → 1 H10 Si10 O15 + 30 HCl (j) 1 C7 H9 + 3 HNO3 −− → 1 C7 H6 (NO2 )3 + 3 H2 O (k) 1 C5 H8 O2 + 2 NaH + 2 HCl −− → 1 C5 H12 O2 + 2 NaCl Name: Date: Balancing Equations Balance the following chemical equations. 1. Fe + H2S04 Fe2(SO4)3 + H2 2. C2H6 + O2 H2O + CO2 3. KOH + H3PO4 K3PO4 + H2O 4. SnO2 + H2 Sn + H2O 5. NH3 + O2 NO + H2O 6. KNO3 + H2CO3 K2CO3 + HNO3 7. B2Br6 + HNO3 B(NO3)3 + HBr 8. BF3 + Li2SO3 B2(SO3)3 + LiF 9. (NH4)3PO4 + Pb(NO3)4 Pb3(PO4)4 + NH4NO3 10. SeCl6 + O2 SeO2 + Cl2 About Chemistry http://chemistry.about.com Name: Date: Balancing Equations Balance the following chemical equations. 1. CH4 + O2 CO2 2. Na+ + Cl- NaCl 3. Al + O2 Al2O3 4. N2+ + H2 NH3 5. CO(g) + H2(g) 6. FeO3(s) + 7. H2SO4 8. + H2O C8H18(l) + H2O CO(g) Fe(l) + CO2(g) + Pb(OH)4 Pb(SO4)2 + H2O Al + HCl AlCl3 + H2 9. Ca3(PO4)2 + H2SO4 CaSO4 + Ca(H2PO4)2 10. H3PO4 + HCl PCl5 + H2O About Chemistry http://chemistry.about.com Name: Date: Balancing Equations Balance the following chemical equations. 1. SiCl4(l) + H2O(l) SiO2(s) + HCl(aq) 2. As + NaOH Na3AsO3 + H2 3. Au2S3 + H2 Au + H2S 4. V2O5 + HCl VOCl3 + H2O 5. Hg(OH)2 + H3PO4 Hg3(PO4)2 + H2O 6. SiO2 + HF SiF4 + H2O 7. Zn + HCl ZnCl2 + H2 8. HClO4 + P4O10 H3PO4 + Cl2O7 9. N2(g) + O2(g) 10. NH4NO3 About Chemistry + N2 H2O + HNO3(aq) O2 + http://chemistry.about.com H2O Name: Date: Balancing Equations Balance the following chemical equations. 1. AgI + Na2S Ag2S + NaI 2. Na3PO4 + HCl NaCl + H3PO4 3. Ba3N2 + H2O Ba(OH)2 + NH3 4. TiCl4 + H2O TiO2 + HCl 5. CaCl2 + Na3PO4 Ca3(PO4)2 + NaCl 6. NaBr + Cl2 NaCl + Br2 7. Mg(OH)2 + HCl MgCl2 + H2O 8. FeS + O2 Fe2O3 + SO2 9. PCl5 + H2O H3PO4 + HCl 10. C2H6O + O2 CO2 + H2O About Chemistry http://chemistry.about.com Name: Date: Balancing Equations Balance the following chemical equations. 1. 2 Fe + 3 H2S04 1 Fe2(SO4)3 + 3 H2 2. 2 C2H6 + 7 O2 6 H2O + 4 CO2 3. 3 KOH + 1 H3PO4 1 K3PO4 + 3 H2O 4. 1 SnO2 + 2 H2 1 Sn + 2 H2O 5. 4 NH3 + 5 O2 4 NO + 6 H2O 6. 2 KNO3 + 1 H2CO3 1 K2CO3 + 2 HNO3 7. 1 B2Br6 + 6 HNO3 2 B(NO3)3 + 6 HBr 8. 2 BF3 + 3 Li2SO3 1 B2(SO3)3 + 6 LiF 9. 4 (NH4)3PO4 + 3 Pb(NO3)4 1 Pb3(PO4)4 + 12 NH4NO3 10. 1 SeCl6 + 1 O2 1 SeO2 + 3 Cl2 About Chemistry http://chemistry.about.com Name: Date: Balancing Equations Balance the following chemical equations. 1. 1 CH4 + 2 O2 1 CO2 2. 2 Na+ + 2 Cl- 1 NaCl 3. 4 Al + 3 O2 2 Al2O3 4. 1 N2+ + 3 H2 2 NH3 5. 8 CO(g) + 17 H2(g) 1 6. 1 FeO3(s) + 3 CO(g) 7. 2 H2SO4 + 1 8. 2 Al + 9. 1 Ca3(PO4)2 + 10. 1 H3PO4 About Chemistry + + 2 H2O C8H18(l) + 8 H2O 1 Fe(l) + 3 CO2(g) Pb(OH)4 1 Pb(SO4)2 + 4 H2O 6 HCl 2 AlCl3 + 3 H2 2 H2SO4 2 CaSO4 + 1 Ca(H2PO4)2 5 HCl 1 PCl5 + 4 H2O http://chemistry.about.com Name: Date: Balancing Equations Balance the following chemical equations. 1. 1 SiCl4(l) + 2 H2O(l) 1 SiO2(s) + 4 HCl(aq) 2. 2 As + 6 NaOH 2 Na3AsO3 + 3 H2 3. 1 Au2S3 + 3 H2 2 Au + 3 H2S 4. 1 V2O5 + 6 HCl 2 VOCl3 + 3 H2O 5. 3 Hg(OH)2 + 2 H3PO4 1 Hg3(PO4)2 + 6 H2O 6. 1 SiO2 + 4 HF 1 SiF4 + 2 H2O 7. 1 Zn + 2 HCl 1 ZnCl2 + 1 H2 8. 12 HClO4 + 1 P4O10 4 H3PO4 + 6 Cl2O7 9. 2 N2(g) + 5 O2(g) 10. 2 NH4NO3 About Chemistry 2 + N2 2 + H2O 1 4 O2 + HNO3(aq) 4 http://chemistry.about.com H2O Name: Date: Balancing Equations Balance the following chemical equations. 1. 2 AgI + 1 Na2S 1 Ag2S + 2 NaI 2. 1 Na3PO4 + 3 HCl 3 NaCl + 1 H3PO4 3. 1 Ba3N2 + 6 H2O 3 Ba(OH)2 + 2 NH3 4. 1 TiCl4 + 2 H2O 1 TiO2 + 4 HCl 5. 3 CaCl2 + 2 Na3PO4 1 Ca3(PO4)2 + 6 NaCl 6. 2 NaBr + 1 Cl2 2 NaCl + 1 Br2 7. 1 Mg(OH)2 + 2 HCl 1 MgCl2 + 2 H2O 8. 4 FeS + 7 O2 2 Fe2O3 + 4 SO2 9. 1 PCl5 + 4 H2O 1 H3PO4 + 5 HCl 10. 1 C2H6O + 3 O2 2 CO2 + 3 H2O About Chemistry http://chemistry.about.com Balancing Chemical Equations – Grade Nine Attachment C Balancing Equations Worksheet Balance the following equations: 1. Limestone (CaCO3), a common Ohio mineral, can be heated to produce calcium oxide. CaCO3 CaO + CO2 2. Joseph Priestley discovered oxygen in 1774. He heated mercury (II) oxide to form mercury and oxygen. HgO Hg + O2 3. Ammonia is an important compound used to make fertilizers. It is produced by reacting nitrogen and hydrogen. N2 + H2 NH3 4. Photosynthesis is a reaction by which plants convert carbon dioxide and water into sugar. CO2 + H2O C6H12O6 + O2 5. Combustion of gasoline in an automobile engine not only produces carbon dioxide and water but also energy. C8H18 + O2 CO2 + H2O 6. Marble (calcium carbonate) reacts with sulfuric acid (one possible acid in acid rain). + H2SO4 CaSO4 CaCO3 + H2O + CO2 7. Iron reacts with oxygen in the air to form rust (Fe2O3). Fe + O2 Fe2O3 8. Magnesium hydroxide (one ingredient in a popular antacid) is used to neutralize stomach acid. Mg(OH)2 + HCl MgCl2 + H2O 9. Silver nitrate and sodium bromide are used to make silver bromide (a sun-sensitive substance useful in photographic processes). Ag NO3 + NaBr AgBr + NaNO3 10 Balancing Chemical Equations – Grade Nine Attachment C (continued) Balancing Equations Worksheet Answers: 1. CaCO3 CaO + CO2 2. 2HgO 2Hg + 3. N2 + 3H2 O2 2NH3 4. 6CO2 + 6H2O C6H12O6 25O2 + 6O2 5. 2C8H18 + 16CO2 + 18H2O 6. CaCO3 + H2SO4 CaSO4 + H2O + CO2 7. 4Fe + 3O2 8. Mg(OH)2 9. Ag NO3 2Fe2O3 + 2HCl + NaBr MgCl2 + AgBr + 2H2O NaNO3 11 Honors Chemistry Writing and Balancing Equations Worksheet Balance a chemical equation. STO.1 Name: ___________________ STO.2 Identify the parts of a chemical equation. RXN.1 Describe a chemical reaction using words and symbolic equations. For each of the following problems, write complete chemical equations to describe the chemical process taking place. Balance the equations. 1) When lithium hydroxide pellets are added to a solution of sulfuric acid (H2SO4), lithium sulfate and water are formed. 2) Magnesium reacts with sodium fluoride to produce magnesium fluoride and elemental sodium. 3) If a copper coil is placed into a solution of silver nitrate, silver crystals form and copper (I) nitrate is generated. 4) When crystalline C6H12O6 is burned in oxygen, carbon dioxide and water vapor are formed. 5) Calcium carbonate combines with hydrochloric acid (HCl) to produce calcium chloride, water and carbon dioxide gas. Balance the equations below: 1) ____ N2 + ____ H2 ____ NH3 2) ____ KClO3 ____ KCl + ____ O2 3) ____ NaCl + ____ F2 ____ NaF + ____ Cl2 4) ____ H2 + ____ O2 ____ H2O 5) ____ Pb(OH)2 + ____ HCl ____ H2O + ____ PbCl2 6) ____ AlBr3 + ____ K2SO4 ____ KBr + ____ Al2(SO4)3 7) ____ CH4 + ____ O2 ____ CO2 + ____ H2O 8) ____ C3H8 + ____ O2 ____ CO2 + ____ H2O 9) ____ C8H18 + ____ O2 ____ CO2 + ____ H2O 10) ____ FeCl3 + ____ NaOH ____ Fe(OH)3 + ____NaCl 11) ____ P + ____O2 ____P2O5 Honors Chemistry Writing and Balancing Equations Worksheet Name: ___________________ 12) ____ Na + ____ H2O ____ NaOH + ____H2 13) ____ Ag2O ____ Ag + ____O2 14) ____ S8 + ____O2 ____ SO3 15) ____ CO2 + ____ H2O ____ C6H12O6 + ____O2 16) ____ K + ____ MgBr2 ____ KBr + ____ Mg 17) ____ HCl + ____ CaCO3 ____ CaCl2 + ____H2O + ____ CO2 18) ____ HNO3 + ____ NaHCO3 ____ NaNO3 + ____ H2O + ____ CO2 19) ____ H2O + ____ O2 ____ H2O2 20) ____ NaBr + ____ CaF2 ____ NaF + ____ CaBr2 21) ____ H2SO4 + ____ NaNO2 ____ HNO2 + ____ Na2SO4 Word Equations Write the word equations below as chemical equations and balance: 1) Zinc and lead (II) nitrate react to form zinc nitrate and lead. 2) Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas. 3) Sodium phosphate and calcium chloride react to form calcium phosphate and sodium chloride. 4) Potassium metal and chlorine gas combine to form potassium chloride. 5) Aluminum and hydrochloric acid react to form aluminum chloride and hydrogen gas. 6) Calcium hydroxide and phosphoric acid react to form calcium phosphate and water. 7) Copper and sulfuric acid react to form copper (II) sulfate and water and sulfur dioxide. 8) Hydrogen gas and nitrogen monoxide react to form water and nitrogen gas. Honors Chemistry Writing and Balancing Equations Worksheet Name: ___________________ Word Equations – Answer Key 1) Zinc and lead (II) nitrate react to form zinc nitrate and lead. Zn + Pb(NO3)2 Zn(NO3)2 + Pb _______________________________________________________________ 2) Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas. 2 AlBr3 + 3 Cl2 2 AlCl3 + 3 Br2 _______________________________________________________________ 3) Sodium phosphate and calcium chloride react to form calcium phosphate and sodium chloride. 2 Na3PO4 + 3 CaCl2 6 NaCl + Ca3(PO4)2 _______________________________________________________________ 4) Potassium metal and chlorine gas combine to form potassium chloride. 2 K + Cl2 2 KCl _______________________________________________________________ 5) Aluminum and hydrochloric acid react to form aluminum chloride and hydrogen gas. 2 Al + 6 HCl 3 H2 + 2 AlCl3 _______________________________________________________________ 6) Calcium hydroxide and phosphoric acid react to form calcium phosphate and water. 3 Ca(OH)2 + 2 H3PO4 Ca3(PO4)2 + 6 H2O _______________________________________________________________ 7) Copper and sulfuric acid react to form copper (II) sulfate and water and sulfur dioxide. Cu + 2 H2SO4 CuSO4 + 2 H2O + SO2 _______________________________________________________________ 8) Hydrogen gas and nitrogen monoxide react to form water and nitrogen gas. 2 H2 + 2 NO 2 H2O + N2 Honors Chemistry Writing and Balancing Equations Worksheet Name: ___________________ Balancing Chemical Equations – Answer Key Balance the equations below: 1) 1 N2 + 3 H2 2 NH3 2) 2 KClO3 2 KCl + 3 O2 3) 2 NaCl + 1 F2 2 NaF + 1 Cl2 4) 2 H2 + 1 O2 2 H2O 5) 1 Pb(OH)2 + 2 HCl 2 H2O + 1 PbCl2 6) 2 AlBr3 + 3 K2SO4 6 KBr + 1 Al2(SO4)3 7) 1 CH4 + 2 O2 1 CO2 + 2 H2O 8) 1 C3H8 + 5 O2 3 CO2 + 4 H2O 9) 2 C8H18 + 25 O2 16 CO2 + 18 H2O 10) 1 FeCl3 + 3 NaOH 1 Fe(OH)3 + 3 NaCl 11) 4 P + 5 O2 2 P2O5 12) 2 Na + 2 H2O 2 NaOH + 1 H2 13) 2 Ag2O 4 Ag + 1 O2 14) 1 S8 + 12 O2 8 SO3 15) 6 CO2 + 6 H2O 1 C6H12O6 + 6 O2 16) 1 K + 1 MgBr 1 KBr + 1 Mg 17) 2 HCl + 1 CaCO3 1 CaCl2 + 1 H2O + 1 CO2 18) 1 HNO3 + 1 NaHCO3 1 NaNO3 + 1 H2O + 1 CO2 19) 2 H2O + 1 O2 2 H2O2 20) 2 NaBr + 1 CaF2 2 NaF + 1 CaBr2 21) 1 H2SO4 + 2 NaNO2 2 HNO2 + 1 Na2SO4 W 301 Balancing Equations Worksheet 1) ___ H3PO4 + ___ KOH Æ ___ K3PO4 + ___ H2O 2) ___ K + ___ B2O3 Æ ___ K2O + ___ B 3) ___ HCl + ___ NaOH Æ ___ NaCl + ___ H2O 4) ___ Na + ___ NaNO3 Æ ___ Na2O + ___ N2 5) ___ C + ___ S8 Æ ___ CS2 6) ___ Na + ___ O2 Æ ___ Na2O 7) ___ N2 + ___ O2 Æ ___ N2O5 8) ___ H3PO4 + ___ Mg(OH)2 Æ ___ Mg3(PO4)2 + ___ H2O 9) ___ NaOH + ___ H2CO3 Æ ___ Na2CO3 + ___ H2O 10) ___ KOH + ___ HBr Æ ___ KBr + ___ H2O 11) ___ Na + ___ O2 Æ ___ Na2O 12) ___ Al (OH)3 + ___ H2CO3 Æ ___ Al2(CO3)3 + ___ H2O 13) ___ Al + ___ S8 Æ ___ Al2S3 14) ___ Cs + ___ N2 Æ ___ Cs3N 15) ___ Mg + ___ Cl2 Æ ___ MgCl2 16) ___ Rb + ___ RbNO3 Æ ___ Rb2O + ___ N2 17) ___ C6H6 + ___ O2 Æ ___ CO2 + ___ H2O 18) ___ N2 + ___ H2 Æ ___ NH3 19) ___ C10H22 + ___ O2 Æ ___ CO2 + ___ H2O 20) ___ Al(OH)3 + ___ HBr Æ ___ AlBr3 + ___ H2O 21) ___ CH3CH2CH2CH3 + ___ O2 Æ ___ CO2 + ___ H2O 22) ___ C3H8 + ___ O2 Æ ___ CO2 + ___ H2O 23) ___ Li + ___ AlCl3 Æ ___ LiCl + ___ Al 24) ___ C2H6 + ___ O2 Æ ___ CO2 + ___ H2O 25) ___ NH4OH + ___ H3PO4 Æ ___ (NH4)3PO4 + ___ H2O 26) ___ Rb + ___ P Æ ___ Rb3P 27) ___ CH4 + ___ O2 Æ ___ CO2 + ___ H2O 28) ___ Al(OH)3 + ___ H2SO4 Æ ___ Al2(SO4)3 + ___ H2O 29) ___ Na + ___ Cl2 Æ ___ NaCl 30) ___ Rb + ___ S8 Æ ___ Rb2S 31) ___ H3PO4 + ___ Ca(OH)2 Æ ___ Ca3(PO4)2 + ___ H2O 32) ___ NH3 + ___ HCl Æ ___ NH4Cl 33) ___ Li + ___ H2O Æ ___ LiOH + ___ H2 34) ___ Ca3(PO4)2 + ___ SiO2 + ___ C Æ ___ CaSiO3 + ___ CO + ___ P 35) ___ NH3 + ___ O2 Æ ___ N2 + ___ H2O 36) ___ FeS2 + ___ O2 Æ ___ Fe2O3 + ___ SO2 37) ___ C + ___ SO2 Æ ___ CS2 + ___ CO Everett Community College Tutoring Center W 301 Balancing Equations Worksheet - Solutions 1) _1_ H3PO4 + _3__ KOH Æ _1__ K3PO4 + _3__ H2O 2) _6__ K + _1__ B2O3 Æ _3__ K2O + _2__ B 3) _1__ HCl + _1__ NaOH Æ _1__ NaCl + _1__ H2O 4) _10__ Na + _2__ NaNO3 Æ _6__ Na2O + _1__ N2 5) _4__ C + _1__ S8 Æ _4__ CS2 6) _4__ Na + _1__ O2 Æ _2__ Na2O 7) _2__ N2 + _5__ O2 Æ _2__ N2O5 8) _2__ H3PO4 + _3__ Mg(OH)2 Æ _1__ Mg3(PO4)2 + _6__ H2O 9) _2__ NaOH + _1__ H2CO3 Æ _1__ Na2CO3 + _2__ H2O 10) _1__ KOH + _1__ HBr Æ _1__ KBr + _1__ H2O 11) _4__ Na + _1__ O2 Æ _2__ Na2O 12) _2__ Al (OH)3 + _3__ H2CO3 Æ _1__ Al2(CO3)3 + _6__ H2O 13) _16__ Al + _3__ S8 Æ _8__ Al2S3 14) _6__ Cs + _1__ N2 Æ _2__ Cs3N 15) _1__ Mg + _1__ Cl2 Æ _1__ MgCl2 16) _10__ Rb + _2__ RbNO3 Æ _6__ Rb2O + _1__ N2 17) _2__ C6H6 + _15__ O2 Æ _12__ CO2 + _6__ H2O 18) _1__ N2 + _3__ H2 Æ _2__ NH3 19) _2__ C10H22 + _31__ O2 Æ _20__ CO2 + _22__ H2O 20) _1__ Al(OH)3 + _3__ HBr Æ _1__ AlBr3 + _3__ H2O 21) _2__ CH3CH2CH2CH3 + _13__ O2 Æ _8__ CO2 + _10__ H2O 22) _1__ C3H8 + _5__ O2 Æ _3__ CO2 + _4__ H2O 23) _3__ Li + _1__ AlCl3 Æ _3__ LiCl + _1__ Al 24) _2__ C2H6 + _7__ O2 Æ _4__ CO2 + _6__ H2O 25) _3__ NH4OH + _1__ H3PO4 Æ _1__ (NH4)3PO4 + _3__ H2O 26) _3__ Rb + _1__ P Æ _1__ Rb3P 27) _1__ CH4 + _2__ O2 Æ _1__ CO2 + _2__ H2O 28) _2__ Al(OH)3 + _3__ H2SO4 Æ _1__ Al2(SO4)3 + _6__ H2O 29) _2__ Na + _1__ Cl2 Æ _2__ NaCl 30) _16__ Rb + _1__ S8 Æ _8__ Rb2S 31) _2__ H3PO4 + _3__ Ca(OH)2 Æ _1__ Ca3(PO4)2 + _6__ H2O 32) _1__ NH3 + _1__ HCl Æ _1__ NH4Cl 33) _2__ Li + _2__ H2O Æ _2__ LiOH + _1__ H2 34) _1__ Ca3(PO4)2 + _3__ SiO2 + _5__ C Æ _3__ CaSiO3 + _5__ CO + _2__ P 35) _4__ NH3 + _3__ O2 Æ _2__ N2 + _6__ H2O 36) _4__ FeS2 + _11__ O2 Æ _2__ Fe2O3 + _8__ SO2 37) _5__ C + _2__ SO2 Æ _1__ CS2 + _4__ CO Everett Community College Tutoring Center Name ____________________________ Period:___________ Balancing Chemical Equations Worksheet For the following: 1. Draw a circle around each subscript. 2. Draw a square around each coefficient. H2O 5Cl2 2Mg 3H2O2 For the following 1. List the chemical symbols of each element. 2. Give the number of atoms of each element. HCl CO2 Na2SO4 Balance the following chemical equations. 1. ____ Cu2O + ____ C ____ Cu + ____ CO2 2. ____ H2O2 ____H2O + ____O2 3. ____ Al + ____Fe3N2 ___ AlN + ____ Fe 4. ____Ag2S ____Ag + ____ S8 5. ____ ZnS + ____AlP ____Zn3P2 + ____Al2S3 6. ____ Fe(OH)3 ____ Fe2O3 + ____H2O Given the two chemical equations, circle the one that is balanced. 7. a. 2Na + Cl2 2NaCl b. 2Na + 2Cl2 2NaCl 8. a. C3H8 + 5O2 3CO2 + 4H2O b. 2C3H8 + 5O2 3CO2 + 8H2O 9. a. 2NH3 + 5O2 2NO + 3H2O b. 4NH3 + 5O2 4NO + 6H2O 10. a. Y(NO3)2 + GaPO4 YPO4 + Ga(NO3)2 b. 2Y(NO3)2 + 2GaPO4 2YPO4 + Ga(NO3)2 For practice and homework balance the equations below. 11) ____ N2 + ____ H2 ____ NH3 12) ____ KClO3 ____ KCl + ____ O2 13) ____ NaCl + ____ F2 ____ NaF + ____ Cl2 14) ____ H2 + ____ O2 ____ H2O 15) ____ Pb(OH)2 + ____ HCl ____ H2O + ____ PbCl2 16) ____ AlBr3 + ____ K2SO4 ____ KBr + ____ Al2(SO4)3 17) ____ CH4 + ____ O2 ____ CO2 + ____ H2O 18) ____ C3H8 + ____ O2 ____ CO2 + ____ H2O 19) ____ C8H18 + ____ O2 ____ CO2 + ____ H2O 20) ____ FeCl3 + ____ NaOH ____ Fe(OH)3 + ____NaCl 21) ____ P + ____O2 ____P2O5 22) ____ Na + ____ H2O ____ NaOH + ____H2 23) ____ Ag2O ____ Ag + ____O2 24) ____ S8 + ____O2 ____ SO3 25) ____ CO2 + ____ H2O ____ C6H12O6 + ____O2 26) ____ K + ____ MgBr ____ KBr + ____ Mg 27) ____ HCl + ____ CaCO3 ____ CaCl2 + ____H2O + ____ CO2 28) ____ HNO3 + ____ NaHCO3 ____ NaNO3 + ____ H2O + ____ CO2 29) ____ H2O + ____ O2 ____ H2O2 30) ____ NaBr + ____ CaF2 ____ NaF + ____ CaBr2 ANSWER KEY Balancing Chemical Equations Worksheet This assessment addresses the following State of Tennessee 8th grade science standards: SPI 0807.9.10 Identify the reactants and products of a chemical reaction. SPI 0807.9.11 Recognize that in a chemical reaction, the mass of the reactants is equal to the mass of the products (Law of Conservation of Mass). For the following: 1. Draw a circle around each subscript. 2. Draw a square around each coefficient. H2O 5Cl2 2Mg 3H2O2 For the following 1. List the chemical symbols of each element. 2. Give the number of atoms of each element. HCl H=1 Cl = 1 CO2 C=1 O=2 Na2SO4 Na = 2 S=1 O=4 Balance the following chemical equations. 1. _2__ Cu2O + ____ C _4_ Cu + ____ CO2 2. __2_ H2O2 __2_H2O + ____O2 3. __2_ Al + ____Fe3N2 _2_ AlN + __3_ Fe 4. __8_Ag2S _16_Ag + ____ S8 5. __3_ ZnS + __2_AlP ____Zn3P2 + ____Al2S3 6. __2_ Fe(OH)3 ____ Fe2O3 + __3_H2O Given the two chemical equations, circle the one that is balanced. 7. a. 2Na + Cl2 2NaCl b. 2Na + 2Cl2 2NaCl 8. a. C3H8 + 5O2 3CO2 + 4H2O b. 2C3H8 + 5O2 3CO2 + 8H2O 9. a. 2NH3 + 5O2 2NO + 3H2O b. 4NH3 + 5O2 4NO + 6H2O 10. a. Y(NO3)2 + GaPO4 YPO4 + Ga(NO3)2 b. 2Y(NO3)2 + 2GaPO4 2YPO4 + Ga(NO3)2 WS#1: Balancing Chemical Equations – Answer Key Balance the equations below: 11) 1 N2 + 3 H2 2 NH3 12) 2 KClO3 2 KCl + 3 O2 13) 2 NaCl + 1 F2 2 NaF + 1 Cl2 14) 2 H2 + 1 O2 2 H2O 15) 1 Pb(OH)2 + 2 HCl 2 H2O + 1 PbCl2 16) 2 AlBr3 + 3 K2SO4 6 KBr + 1 Al2(SO4)3 17) 1 CH4 + 2 O2 1 CO2 + 2 H2O 18) 1 C3H8 + 5 O2 3 CO2 + 4 H2O 19) 2 C8H18 + 25 O2 16 CO2 + 18 H2O 20) 1 FeCl3 + 3 NaOH 1 Fe(OH)3 + 3 NaCl 21) 4 P + 5 O2 2 P2O5 22) 2 Na + 2 H2O 2 NaOH + 1 H2 13) 2 Ag2O 4 Ag + 1 O2 14) 1 S8 + 12 O2 8 SO3 15) 6 CO2 + 6 H2O 1 C6H12O6 + 6 O2 16) 1 K + 1 MgBr 1 KBr + 1 Mg 17) 2 HCl + 1 CaCO3 1 CaCl2 + 1 H2O + 1 CO2 18) 1 HNO3 + 1 NaHCO3 1 NaNO3 + 1 H2O + 1 CO2 19) 2 H2O + 1 O2 2 H2O2 20) 2 NaBr + 1 CaF2 2 NaF + 1 CaBr2 21) 1 H2SO4 + 2 NaNO2 2 HNO2 + 1 Na2SO4 Balancing Chemical Equations Balance the equations below: 1) ____ N2 + ____ H2 Æ ____ NH3 2) ____ KClO3 Æ ____ KCl + ____ O2 3) ____ NaCl + ____ F2 Æ ____ NaF + ____ Cl2 4) ____ H2 + ____ O2 Æ ____ H2O 5) ____ Pb(OH)2 + ____ HCl Æ ____ H2O + ____ PbCl2 6) ____ AlBr3 + ____ K2SO4 Æ ____ KBr + ____ Al2(SO4)3 7) ____ CH4 + ____ O2 Æ ____ CO2 + ____ H2O 8) ____ C3H8 + ____ O2 Æ ____ CO2 + ____ H2O 9) ____ C8H18 + ____ O2 Æ ____ CO2 + ____ H2O 10) ____ FeCl3 + ____ NaOH Æ ____ Fe(OH)3 + ____NaCl 11) ____ P + ____O2 Æ ____P2O5 12) ____ Na + ____ H2O Æ ____ NaOH + ____H2 13) ____ Ag2O Æ ____ Ag + ____O2 14) ____ S8 + ____O2 Æ ____ SO3 15) ____ CO2 + ____ H2O Æ ____ C6H12O6 + ____O2 16) ____ K + ____ MgBr Æ ____ KBr + ____ Mg 17) ____ HCl + ____ CaCO3 Æ ____ CaCl2 + ____H2O + ____ CO2 18) ____ HNO3 + ____ NaHCO3 Æ ____ NaNO3 + ____ H2O + ____ CO2 19) ____ H2O + ____ O2 Æ ____ H2O2 20) ____ NaBr + ____ CaF2 Æ ____ NaF + ____ CaBr2 21) ____ H2SO4 + ____ NaNO2 Æ ____ HNO2 + ____ Na2SO4 WKS001x019 © 2000 Cavalcade Publishing (http://www.cavalcadepublishing.com) All Rights Reserved Balancing Chemical Equations – Answer Key Balance the equations below: 1) 1 N2 + 3 H2 Æ 2 NH3 2) 2 KClO3 Æ 2 KCl + 3 O2 3) 2 NaCl + 1 F2 Æ 2 NaF + 1 Cl2 4) 2 H2 + 1 O2 Æ 2 H2O 5) 1 Pb(OH)2 + 2 HCl Æ 2 H2O + 1 PbCl2 6) 2 AlBr3 + 3 K2SO4 Æ 6 KBr + 1 Al2(SO4)3 7) 1 CH4 + 2 O2 Æ 1 CO2 + 2 H2O 8) 1 C3H8 + 5 O2 Æ 3 CO2 + 4 H2O 9) 2 C8H18 + 25 O2 Æ 16 CO2 + 18 H2O 10) 1 FeCl3 + 3 NaOH Æ 1 Fe(OH)3 + 3 NaCl 11) 4 P + 5 O2 Æ 2 P2O5 12) 2 Na + 2 H2O Æ 2 NaOH + 1 H2 13) 2 Ag2O Æ 4 Ag + 1 O2 14) 1 S8 + 12 O2 Æ 8 SO3 15) 6 CO2 + 6 H2O Æ 1 C6H12O6 + 6 O2 16) 1 K + 1 MgBr Æ 1 KBr + 1 Mg 17) 2 HCl + 1 CaCO3 Æ 1 CaCl2 + 1 H2O + 1 CO2 18) 1 HNO3 + 1 NaHCO3 Æ 1 NaNO3 + 1 H2O + 1 CO2 19) 2 H2O + 1 O2 Æ 2 H2O2 20) 2 NaBr + 1 CaF2 Æ 2 NaF + 1 CaBr2 21) 1 H2SO4 + 2 NaNO2 Æ 2 HNO2 + 1 Na2SO4 WKS001x019 © 2000 Cavalcade Publishing (http://www.cavalcadepublishing.com) All Rights Reserved