Combination Reactions 2H 2 + O 2 2H 2 O. 2Na + I 2 2NaI. Ca + Cl 2 CaCl 2. C + O 2 CO 2 or 2C + O 2 2CO 3H 2 + N 2 2NH 3

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1 Combination Reactions Predict the product and write balanced reactions for each of the following. 1. Hydrogen burned in oxygen. 2H 2 + O 2 2H 2 O 2. Sodium plus iodine. 2Na + I 2 2NaI 3. Calcium burned in chlorine. Ca + Cl 2 CaCl 2 4. Carbon burned in oxygen. C + O 2 CO 2 or 2C + O 2 2CO 5. Hydrogen combined with nitrogen. 3H 2 + N 2 2NH 3 6. Sulfur burned in air. 2S + O 2 2SO or S + O 2 SO 2 or 2S + 3O 2 2SO 3 7. Magnesium burned in hydrogen. Mg + H 2 MgH 2 8. Zinc plus bromine. Zn + Br 2 ZnBr 2 9. Water plus carbon dioxide. H 2 O + CO 2 H 2 CO Sulfur dioxide plus water. SO 2 + H 2 O H 2 SO Sodium plus hydrogen. 2Na + H 2 2NaH 12. Hydrogen burned in chlorine. H 2 + Cl 2 2HCl 13. Iron burned in chlorine. Fe + Cl 2 FeCl 2 or 2Fe + 3Cl 2 2FeCl Copper plus fluorine. 2Cu + F 2 2CuF or Cu + F 2 CuF Aluminum burned in air. 4Al + 3O 2 2Al 2 O Calcium oxide plus water. CaO + H 2 O Ca(OH) Iron combined with sulfur. Fe + S FeS or 2Fe + 3S Fe 2 S Zinc burned in chlorine. Zn + Cl 2 ZnCl Lithium oxide plus water. Li 2 O + H 2 O 2LiOH 20. Barium oxide plus water. BaO + H 2 O Ba(OH) 2 Chemistry L. H. S. Reaction Prediction Answers Page 1 of 9

2 Decomposition Reactions Predict the products and write balanced reactions for each of the following: 1. The heating of magnesium carbonate. 11. The electrolysis of calcium bromide. MgCO 3 MgO + CO2 CaBr 2 Ca + Br 2 2. The heating of sodium chlorate. 12. The heating of carbonic acid. 2NaClO 3 2NaCl + 3O2 H 2 CO 3 H2O + CO 2 3. The electrolysis of water. 2H 2 O 2H2 + O 2 4. The decomposition of calcium carbonate. CaCO 3 CaO + CO 2 5. The heating of mercuric oxide. 2HgO 2Hg + O2 6. The electrolysis of sodium chloride. 2NaCl 2Na + Cl 7. Ferric hydroxide heated. 2Fe(OH) 3 8. Aluminum hydroxide heated. 2Al(OH) 3 9. Sodium carbonate heated. Na 2 CO 3 2 Fe2O 3 + 3H 2 O Al2O 3 + 3H 2 O Na2O + CO Decomposition of sulfuric acid. H 2 SO 4 H 2 O + SO Decomposition of calcium chlorate. Ca(ClO 3 ) 2 CaCl 2 + 3O Heating of potassium bromate. 2KBrO 3 2KBr + 3O2 16. Decomposition of sulfurous acid. H 2 SO 3 H 2 O + SO Electrolysis of aluminum oxide. 2Al 2 O 3 4Al + 3O 18. Zinc carbonate heated. ZnCO 3 ZnO + CO2 19. Decomposition of phosphoric acid. 2H 3 PO 4 3H 2 O + P 2 O Heating of sodium tetraborate trihydrate Barium hydroxide heated. Ba(OH) 2 BaO + H2O Na 2 B 4 O 7 3H 2 O Na2B 4 O 7 + 3H 2 O Chemistry L. H. S. Reaction Prediction Answers Page 2 of 9

3 Single Displacement Reactions Predict the products and write balanced reactions for each of the following: 1. Chlorine plus sodium iodide. 11. Mercuric sulfate and zinc. Cl 2 + 2NaI 2NaCl + I 2 2. Zinc and phosphoric acid. HgSO 4 + Zn ZnSO 4 + Hg 12. Potassium and water. 3Zn + 2H 3 PO 4 Zn 3 (PO 4 ) 2 + 3H 2 3. Sodium and water. 2K + 2H 2 O 2KOH + H Carbonic acid plus aluminum. 2Na + 2H 2 O 2NaOH + H 2 4. Calcium and hydrochloric acid. Ca 2HCl CaCl 2 + H 2 5. Calcium plus water. Ca + 2H 2 O Ca(OH) 2 + H 2 6. Zinc sulfate plus sodium. ZnSO 4 + 2Na Na 2 SO 4 + Zn 7. Ferrous chloride plus aluminum. 3FeCl 2 + 2Al 2AlCl 3 + 3Fe 8. Ammonium iodide and chlorine. 2NH 4 I + Cl 2 2NH 4 Cl + I 2 9. Nickel and sulfuric acid. Ni + H 2 SO 4 NiSO 4 + H Strontium and water. Sr + 2H 2 O Sr(OH) 2 + H 2 3H 2 CO 3 + 2Al Al 2 (CO 3 ) 3 + 3H Copper(II) nitrate and zinc. Cu(NO 3 ) 2 + Zn Zn(NO 3 ) 2 + Cu 15. Sodium nitrate and potassium. NaNO 3 + K KNO 3 + Na 16. Silver acetate and copper. AgC 2 H 3 O 2 + Cu CuC 2 H 3 O 2 + Ag 17. Iron added to sulfuric acid. Fe + H 2 SO 4 FeSO 4 + H Zinc plus cupric sulfate. Zn + CuSO 4 ZnSO 4 + Cu 19. Magnesium nitrate added to copper. Mg(NO3)2 + Cu no reaction 20. Cuprous chlorate plus magnesium. 2CuClO 3 + Mg Mg(ClO 3 ) 2 + 2Cu Chemistry L. H. S. Reaction Prediction Answers Page 3 of 9

4 Double Displacement Predict the products and write balanced reactions for each of the following: 1. Sodium chloride and silver nitrate. NaCl + AgNO 3 NaNO 3 + AgCl 2. Barium chlorate and potassium phosphate. 11. Hydrochloric acid plus zinc hydroxide. 2HCl + Zn(OH) 2 ZnCl 2 + 2H 2 O 12. Sodium acetate and aluminum bromide. 3Ba(ClO 3 ) 2 + 2K 3 PO 4 Ba 3 (PO 4 ) 2 + 6KClO 3 3. Ammonium chloride and potassium hydroxide. NH 4 Cl + KOH KCl + NH 4 OH 4. Potassium nitrate plus cupric sulfate. 3NaC 2 H 3 O 2 + AlBr 3 3NaBr + Al(C 2 H 3 O 2 ) Bromic acid and magnesium hydroxide. 2HBrO 3 + Mg(OH) 2 Mg(BrO 3 ) 2 + 2H 2 O 14. Sodium carbonate plus calcium chloride. 2KNO 3 + CuSO 4 K 2 SO 4 + Cu(NO 3 ) 2 5. Sulfuric acid plus potassium hydroxide. H 2 SO 4 + 2KOH K 2 SO 4 + 2H 2 O 6. Hydrochloric acid and calcium carbonate. 2HCl + CaCO 3 CaCl 2 + H 2 CO 3 7. Stannous chloride plus sodium nitrate. SnCl 2 + 2NaNO 3 Sn(NO 3 ) 2 + 2NaCl 8. Strontium chlorate and sodium acetate. Na 2 CO 3 + CaCl 2 2NaCl + CaCO Potassium chloride and silver nitrate. KCl + AgNO 3 KNO 3 + AgCl 16. Barium hydroxide plus ammonium sulfate. Ba(OH) 2 + (NH 4 ) 2 SO 4 BaSO 4 + 2NH 4 OH 17. Ferric chloride and potassium hydroxide. FeCl 3 + 3KOH 3KCl + Fe(OH) Manganese(II) bromide and sodium hydroxide. Sr(ClO 3 ) 2 + 2NaC 2 H 3 O 2 2NaClO 3 + Sr(C 2 H 3 O 2 ) 2 9. Lithium hydroxide and aluminum bromide. 3LiOH + AlBr 3 Al(OH) 3 + 3LiBr 10. Sodium sulfate plus chloric acid. Na 2 SO 4 + 2HClO 3 H 2 SO 4 + 2NaClO 3 MnBr 2 + 2NaOH 2NaBr + Mn(OH) Hydrochloric acid and sodium sulfate. 2HCl + Na 2 SO 4 2NaCl + H 2 SO Sulfurous acid and aluminum hydroxide. 3H 2 SO 3 + 2Al(OH) 3 Al 2 (SO 3 ) 3 + 6H 2 O Chemistry L. H. S. Reaction Prediction Answers Page 4 of 9

5 Reaction Prediction Review Directions: 1. State the type of reaction. 2. If the reaction occurs, write the symbols, complete and balance the equation. 3. If the reaction does not occur, state why not. 1. potassium + iodine 2K + I 2 2KI 2. water decomposition 2H 2 O 2H2 + O 2 3. zinc + lead(ii) chloride Zn + PbCl 2 ZnCl 2 + Pb 4. sodium nitrate + ammonium chloride double displacement NaNO 3 + NH 4 Cl NaCl + NH 4 NO 3 5. mercury + cadmium nitrate Hg + Cd(NO 3 ) 2 no reaction, Hg is less active 6. manganese + sodium Mn + Na no reaction, two metals will not combine 7. silver nitrate + hydrogen sulfide double displacement 2AgNO 3 + H 2 S Ag 2 S + 2HNO 3 8. potassium bromide 2 decomposition 2KBr 2K + Br 9. tin + copper(ii) sulfate Sn + CuSO 4 SnSO 4 + Cu 10. iron(iii) nitrate + sodium chromate double displacement 2Fe(NO 3 ) 3 + 3Na 2 CrO 4 Fe 2 (CrO 4 ) 3 + 6NaNO calcium + iodine Ca + I 2 CaI magnesium + hydrochloric acid Mg + 2HCl MgCl 2 + H carbon + oxygen 2C + O 2 2CO or C + O 2 CO platinum + lead(ii) nitrate Pt + Pb(NO 3 ) 2 no reaction, Pt is less active Chemistry L. H. S. Reaction Prediction Answers Page 5 of 9

6 15. lithium oxide + water 16. aluminum + sulfuric acid Li 2 O + H 2 O 2LiOH 2Al + 3H 2 SO 4 3H 2 + Al 2 (SO 4 ) ammonium phosphate + lithium hydroxide double displacement (NH 4 ) 3 PO 4 + 3LiOH 3NH 4 OH + Li 3 PO chlorine + fluorine Cl 2 + F 2 2ClF 19. sodium carbonate decomposition Na 2 CO 3 Na2O + CO potassium chlorate decomposition 2KClO 3 2KCl + 3O2 21. hydrogen + sodium 22. calcium oxide + water H 2 + 2Na 2NaH CaO + H 2 O Ca(OH) aluminum + hydrochloric acid 2Al + 6HCl 2AlCl 3 + 3H calcium hydroxide + nitric acid double displacement 25. aluminum + magnesium 26. magnesium + zinc nitrate 27. dinitrogen pentoxide + water Ca(OH) 2 + 2HNO 3 Ca(NO 3 ) 2 + 2H 2 O Al + Mg no reaction, two metals will not combine Mg + Zn(NO 3 ) 2 Mg(NO 3 ) 2 + Zn N 2 O 5 + H 2 O 2HNO sodium chlorate decomposition 2NaClO 3 2NaCl + 3O2 29. barium nitrate + sodium dichromate double displacement Ba(NO 3 ) 2 + Na 2 Cr 2 O 7 BaCr 2 O 7 + 2NaNO calcium phosphate + aluminum sulfate double displacement Ca 3 (PO 4 ) 2 + Al 2 (SO 4 ) 3 3CaSO 4 + 2AlPO 4 Chemistry L. H. S. Reaction Prediction Answers Page 6 of 9

7 31. zinc carbonate decomposition ZnCO 3 ZnO + CO2 32. potassium + fluorine 33. sodium + nitric acid 2K + F 2 2KF 2Na + 2HNO 3 H 2 + 2NaNO sodium + water 2Na + 2H 2 O 2NaOH + H ferric iodide + cupric nitrate double displacement 2FeI 3 + 3Cu(NO 3 ) 2 2Fe(NO 3 ) 3 + 3CuI lead + sulfuric acid Pb + H 2 SO 4 PbSO 4 + H sulfur dioxide + water SO 2 + H 2 O H 2 SO oxygen + sulfur O 2 + 2S 2SO or O 2 + S SO 2 or 3O 2 + 2S 2SO potassium nitrate decomposition 2KNO 3 2KNO2 + O sodium bicarbonate decomposition 2NaHCO 3 Na2CO 3 + H 2 O + CO ferrous carbonate + phosphoric acid double displacement 3FeCO 3 + 2H 3 PO 4 Fe 3 (PO 4 ) 2 + 3H 2 CO sulfur trioxide + water SO 3 + H 2 O H 2 SO plumbous chlorate + sodium sulfate double displacement Pb(ClO 3 ) 2 + Na 2 SO 4 PbSO 4 + 2NaClO barium carbonate decomposition BaCO 3 BaO + CO2 45. neon + potassium 46. silver iodide + ferrous sulfide Ne + K no reactions, noble gases are unreactive double displacement 2AgI + FeS Ag 2 S + FeI 2 Chemistry L. H. S. Reaction Prediction Answers Page 7 of 9

8 47. bromine + sodium chloride 48. zinc + sulfuric acid no reaction, bromine is less active than chlorine Zn + H 2 SO 4 ZnSO 4 + H ammonium phosphate + aluminum chloride double displacement (NH 4 ) 3 PO 4 + AlCl 3 3NH 4 Cl + AlPO mercuric oxide decomposition 2HgO 2Hg + O2 51. ammonium nitrite + barium hydroxide double displacement 52. magnesium + water 53. magnesium + acetic acid 2NH 4 NO 2 + Ba(OH) 2 Ba(NO 2 ) 2 + 2NH 4 OH Mg + H 2 O no reaction, Mg is not active enough to replace H from H 2 O Mg + 2HC 2 H 3 O 2 H 2 + Mg(C 2 H 3 O 2 ) silver + barium Ag + Ba no reaction, two metals will not combine 55. plumbous hydroxide decomposition Pb(OH) 2 PbO + H 2O 56. carbonic acid decomposition H 2 CO 3 H2O + CO lithium + curium(iii) fluoride 58. zinc + aluminum nitrate 59. potassium + water 3Li + CmF 3 Cm + 3LiF no reaction, Zn is less active than Al 2K + H 2 O 2KOH + H zinc + water 61. zinc + phosphoric acid Zn + H 2 O no reaction, Zn is not active enough to replace H from H 2 O 3Zn + 2H 3 PO 4 Zn 3 (PO 4 ) 2 + 3H gold + hydrochloric acid Au + HCl no reaction, gold is less active than hydrogen Chemistry L. H. S. Reaction Prediction Answers Page 8 of 9

9 63. calcium bicarbonate decomposition Ca(HCO 3 ) 3 CaCO3 + CO 2 + H 2 O 64. copper(ii) sulfate pentahydrate decomposition CuSO 4 5H 2 O CuSO 65. sulfur dioxide + water SO 2 + H 2 O H 2 SO dinitrogen trioxide + water N 2 O 3 + H 2 O 2HNO barium oxide + water BaO + H 2 O Ba(OH) nickel(ii) chlorate decomposition Ni(ClO 3 ) 2 NiCl 2 + 3O iron + copper(ii) nitrate 4 + 5H2O Fe + Cu(NO 3 ) 2 Cu + Fe(NO 3 ) calcium hydroxide decomposition Ca(OH) 2 CaO + H2O 71. lithium carbonate decomposition Li 2 CO 3 Li2O + CO barium oxide + water BaO + H 2 O Ba(OH) aluminum + water 74. potassium + water Al + H 2 O no reaction, Al is not active enough to replace H from H 2 O 2K + 2H 2 O 2KOH + H sulfur trioxide + water SO 3 + H 2 O H 2 SO magnesium bromate + aluminum dichromate double displacement 3Mg(BrO 3 ) 2 + Al 2 (Cr 2 O 7 ) 3 3MgCr 2 O 7 + 2Al(BrO 3 ) cupric silicate + potassium phosphite double displacement 3CuSiO 3 + 2K 3 PO 3 3K 2 SiO 3 + Cu 3 (PO 3 ) nickel(iii) bicarbonate + zinc 2Ni(HCO 3 ) 3 + 3Zn 2Ni + 3Zn(HCO 3 ) 2 Chemistry L. H. S. Reaction Prediction Answers Page 9 of 9

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