PO 4 NH 4 H + + SO 3

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1 KEY TO AP CHEMISTRY EQUATIONS BY TYPE , , , 1995 Double Replacement 1. Hydrogen sulfide is bubbled through a solution of silver nitrate. H 2 S + Ag 1+ Ag 2 S + H + 2. An excess of sodium hydroxide solution is added to a solution of magnesium nitrate. OH + Mg 2+ Mg(OH) 2 3. Solutions of sodium iodide and lead nitrate are mixed. I + Pb 2+ PbI 2 4. A solution of ammonia is added to a solution of ferric chloride. NH 3 + H 2 O + Fe 3+ NH Fe(OH) 3 5. Solutions of silver nitrate and sodium chromate are mixed. Ag + + CrO 4 2 Ag 2 CrO 4 6. Excess silver acetate is added to a solution of trisodium phosphate. Ag + + PO 4 3 Ag 3 PO 4 7. Manganese(II) nitrate solution is mixed with sodium hydroxide solution. Mn 2+ + OH Mn(OH) 2 8. A saturated solution of calcium hydroxide is added to a solution of magnesium chloride. Mg 2+ + OH Mg(OH) 2 9. Hydrogen sulfide gas is added to a solution of cadmium nitrate. H 2 S + Cd 2+ CdS + H Dilute sulfuric acid is added to a solution of barium acetate. H + + SO Ba2+ + C 2 H 3 O 2 BaSO 4 + HC 2 H 3 O A precipitate is formed when solutions of trisodium phosphate and calcium chloride are mixed. PO Ca 2+ Ca 3 (PO 4 ) A solution of copper(ii) sulfate is added to a solution of barium hydroxide. Cu 2+ + SO Ba 2+ + OH Cu(OH) 2 + BaSO Equal volumes of dilute equimolar solutions of sodium carbonate and hydrochloric acid are mixed. H + + CO 3 2 HCO Solid barium peroxide is added to cold dilute sulfuric acid. BaO 2 +H + + SO 4 2 BaSO 4 + H 2 O Excess hydrochloric acid solution is added to a solution of potassium sulfite. H + + SO 3 2 H 2 O + SO Dilute sulfuric acid is added to a solution of barium chloride. SO Ba 2+ BaSO A solution of sodium hydroxide is added to a solution of ammonium chloride. NH OH NH 3 + H 2 O 18. Dilute hydrochloric acid is added to a solution of potassium carbonate. H + + CO 3 2 H 2 O + CO Gaseous hydrogen sulfide is bubbled through a solution of nickel(ii) nitrate. H 2 S + Ni 2+ NiS + H A solution of sodium sulfide is added to a solution of zinc nitrate. Kristen Henry Jones 1

2 S 2 + Zn 2+ ZnS 21. Concentrated hydrochloric acid is added to solid manganese(ii) sulfide. H + + MnS H 2 S + Mn Solutions of tripotassium phosphate and zinc nitrate are mixed. PO Zn 2+ Zn 3 (PO 4 ) Dilute acetic acid solution is added to solid magnesium carbonate. HC 2 H 3 O 2 + MgCO 3 H 2 O + CO 2 + Mg 2+ + C 2 H 3 O Gaseous hydrofluoric acid reacts with solid silicon dioxide. HF + SiO 2 H 2 O + SiF Equimolar amounts of trisodium phosphate and hydrogen chloride, both in solution, are mixed. PO H + HPO Ammonium chloride crystals are added to a solution of sodium hydroxide. NH 4 Cl + OH NH 3 + H 2 O + Cl 27. Hydrogen sulfide gas is bubbled through a solution of lead(ii) nitrate. H 2 S + Pb 2+ PbS + H Solutions of silver nitrate and sodium chromate are mixed. Ag + + CrO 4 2 Ag 2 CrO Solutions of sodium fluoride and dilute hydrochloric acid are mixed. F + H + HF 30. A saturated solution of barium hydroxide is mixed with a solution of iron(iii) sulfate. Ba 2+ + OH + Fe 3+ + SO 4 2 BaSO 4 + Fe(OH) A solution of ammonium sulfate is added to a potassium hydroxide solution. NH OH NH 3 + H 2 O 32. A solution of ammonium sulfate is added to a saturated solution of barium hydroxide. NH SO Ba 2+ +OH NH 3 + H 2 O + BaSO Dilute sulfuric acid is added to solid calcium fluoride. H + + SO CaF 2 CaSO 4 + HF 34. Dilute hydrochloric acid is added to a dilute solution of mercury(i) nitrate. Cl + Hg 2 2+ Hg 2 Cl Dilute sulfuric acid is added to a solution of lithium hydrogen carbonate. H + + HCO 3 H 2 O + CO Dilute hydrochloric acid is added to a solution of potassium sulfite. H + + SO 3 2 H 2 O + SO Carbon dioxide gas is bubbled through water containing a suspension of calcium carbonate. CO 2 + CaCO 3 + H 2 O HCO 3 + Ca Excess concentrated sulfuric acid is added to solid calcium phosphate. H 2 SO 4 + Ca 3 (PO 4 ) 2 H 3 PO 4 + CaSO 4 (or Ca 2+ + SO 4 2 ) 39. Hydrogen sulfide gas is bubbled into a solution of mercury(ii) chloride. H 2 S + Hg 2+ HgS + H + SingleReplacement 1. A piece of aluminum metal is added to a solution of silver nitrate. Kristen Henry Jones 2

3 Al + Ag + Al 3+ + Ag 2. Aluminum metal is added to a solution of copper(ii) chloride. Al + Cu 2+ Al 3+ + Cu 3. Hydrogen gas is passed over hot copper(ii) oxide. H 2 + CuO H 2 O + Cu 4. Small chunks of solid sodium are added to water. Na + H 2 O Na + + OH + H 2 5. Calcium metal is added to a dilute solution of hydrochloric acid. Ca + H + Ca 2+ + H 2 6. Magnesium turnings are added to a solution of iron(iii) chloride. Mg + Fe 3+ Mg 2+ + Fe 7. Chlorine gas is bubbled into a solution of sodium bromide. Cl 2 + Br Cl + Br 2 8. A strip of magnesium is added to a solution of silver nitrate. Mg + Ag + Mg 2+ + Ag 9. Solid calcium is added to warm water. Ca + H 2 O Ca 2+ + OH + H Liquid bromine is added to a solution of potassium iodide. Br 2 + I Br + I Chlorine gas is bubbled into a solution of potassium iodide. Cl 2 + I Cl + I Lead foil is immersed in silver nitrate solution. Pb + Ag + Pb 2+ + Ag 13. Solid zinc strips are added to a solution of copper(ii) sulfate. Zn + Cu 2+ Zn 2+ + Cu 14. Sodium metal is added to water. Na + H 2 O Na + + OH + H A bar of zinc metal is immersed in a solution of copper(ii) sulfate. Zn + Cu 2+ Zn 2+ + Cu Anhydrides 1. Excess water is added to solid calcium hydride. H 2 O + CaH 2 Ca 2+ + OH or (Ca(OH) 2 )+ H 2 2. Solid lithium hydride is added to water. LiH + H 2 O Li + + OH + H 2 3. Liquid phosphorus trichloride is poured into a large excess of water. PCl 3 + H 2 O H 3 PO 3 + H + + Cl 4. Solid sodium carbide is added to an excess of water. Na 4 C + H 2 O C 2 H 2 + Na + + OH 5. Solid magnesium nitride is added to excess deuterium oxide. Mg 3 N 2 + D 2 O Mg(OD) 2 + ND 3 6. Water is added to a sample of pure phosphorus tribromide. H 2 O + PBr 3 H 3 PO 3 + H + + Br 7. Water is added to a sample of pure sodium hydride. Kristen Henry Jones 3

4 H 2 O + NaH Na + + OH + H 2 8. Dinitrogen trioxide gas is bubbled into water. N 2 O 3 + H 2 O HNO 2 9. Solid phosphorus pentachloride is added to excess water. PCl 5 + H 2 O H 3 PO 4 + H + + Cl 10. Solid dinitrogen pentoxide is added to water. N 2 O 5 + H 2 O H + + NO Sulfur trioxide gas is added to excess water. SO 3 + H 2 O H + + SO Solid sodium oxide is added to water. Na 2 O + H 2 O Na + + OH 13. Phosphorus(V) oxytrichloride is added to water. POCl 3 + H 2 O H 3 PO 4 + H + + Cl 14. Water is added to a sample of solid magnesium nitride. H 2 O + Mg 3 N 2 Mg(OH) 2 + NH Solid potassium oxide is added to water. K 2 O + H 2 O K + + OH 16. Solid sodium cyanide is added to water. NaCN + H 2 O HCN + Na + + OH 17. Trisodium phosphate crystals are added to water. Na 3 PO 4 + H 2 O Na + + OH + HPO 4 2 ( or H 2 PO 4 ) 18. Solid lithium oxide is added to excess water. Li 2 O + H 2 O Li + + OH 19. Solid barium oxide is added to distilled water. BaO + H 2 O Ba 2+ + OH 20. Solid calcium hydride is added to distilled water. CaH 2 + H 2 O Ca 2+ + OH or (Ca(OH) 2 ) + H 2 Combustion 1. Lithium metal is burned in air. Li + O 2 Li2 O 2. The hydrocarbon hexane is burned in excess oxygen. C 6 H 14 + O 2 CO 2 + H 2 O 3. Gaseous diborane, B 2 H 6, is burned in excess oxygen. B 2 H 6 + O 2 B2 O 3 + H 2 O 4. A piece of solid bismuth is heated strongly in oxygen. Bi + O 2 Bi 2 O 3 5. Solid zinc sulfide is heated in an excess of oxygen. ZnS + O 2 ZnO + SO 2 6. Propanol is burned completely in air. C 3 H 7 OH + O 2 CO 2 + H 2 O 7. Excess oxygen gas is mixed with ammonia gas in the presence of platinum. O2 + NH 3 Pt NO 2 + H 2 O 8. Gaseous silane, SiH 4, is burned in oxygen. Kristen Henry Jones 4

5 SiH 4 + O 2 SiO 2 + H 2 O 9. Ethanol is completely burned in air. C 2 H 5 OH + O 2 CO 2 + H 2 O 10. Solid copper(ii) sulfide is heated strongly in oxygen gas. CuS + O 2 CuO + SO Ethanol is burned in oxygen. C 2 H 5 OH + O 2 CO 2 + H 2 O Redox 1. Iron(III) ions are reduced by iodide ions. Fe 3+ + I Fe 2+ + I 2 2. Potassium permanganate solution is added to concentrated hydrochloric acid. MnO 4 + H + + Cl Mn 2+ + Cl 2 + H 2 O 3. Magnesium metal is added to dilute nitric acid, giving as one of the products a compound in which the oxidation number for nitrogen is 3. Mg + H + + NO 3 NH Mg 2+ + H 2 O 4. A solution of potassium iodide is electrolyzed. I + H 2 O I 2 + H 2 + OH 5. Potassium dichromate solution is added to an acidified solution of sodium sulfite. Cr 2 O SO H + Cr 3+ + SO H 2 O 6. Solutions of potassium iodide, potassium iodate, and dilute sulfuric acid are mixed. I + IO 3 + H + H 2 O + I 2 7. A solution of tin(ii) sulfate is added to a solution of iron(iii) sulfate. Sn 2+ + Fe 3+ Sn 4+ + Fe Metallic copper is heated with concentrated sulfuric acid. Cu + H 2 SO 4 Cu 2+ + SO 2 + H 2 O 9. Manganese(IV) oxide is added to warm, concentrated hydrobromic acid. MnO 2 + H + + Br Mn 2+ + Br 2 + H 2 O 10. Chlorine gas is bubbled into cold dilute sodium hydroxide. Cl 2 + OH ClO + Cl + H 2 O 11. Solid iron(iii) oxide is heated in excess carbon monoxide. Fe 2 O 3 + CO Fe + CO Hydrogen peroxide solution is added to acidified potassium iodide solution. H 2 O 2 + H + + I H 2 O + I Hydrogen peroxide is added to an acidified solution of potassium dichromate. H 2 O 2 + H + + Cr 2 O 7 2 H2 O + Cr 3+ + O Sulfur dioxide gas is bubbled through an acidified solution of potassium permanganate. SO 2 + H + + MnO 4 Mn 2+ + H 2 O + SO A solution containing tin(ii) ions is added to an acidified solution of potassium dichromate. Sn 2+ + H + + Cr 2 O 7 2 Cr 3+ + Sn 4+ + H 2 O 16. Solid silver sulfide is warmed with dilute nitric acid. Ag 2 S + H + + NO 3 Ag + + S + NO 2 + H 2 O 17. A dilute solution of sulfuric acid is electrolyzed between platinum electrodes. H 2 O H 2 + O Pellets of lead are dropped into hot sulfuric acid. Pb + H + + SO 4 2 H 2 O + SO 2 + Pb 2+ (or PbSO 4 ) Kristen Henry Jones 5

6 19. Potassium permanganate solution is added to a solution of oxalic acid, H 2 C 2 O 4, acidified with a few drops of sulfuric acid. MnO 4 + H 2 C 2 O 4 + H + Mn 2+ + CO 2 + H 2 O 20. Powdered iron is added to a solution of iron(iii) sulfate. Fe + Fe 3+ Fe A concentrated solution of hydrochloric acid is added to powdered manganese dioxide and gently heated. H + + Cl + MnO 2 Cl 2 + Mn 2+ + H 2 O 22. A strip of copper metal is added to a concentrated solution of sulfuric acid. Cu + H + + SO 4 2 Cu 2+ + SO 2 + H 2 O 23. Copper(II) sulfide is oxidized by dilute nitric acid. CuS + H + + NO 3 Cu 2+ + NO + H 2 O + S 24. A solution of copper(ii) sulfate is electrolyzed using inert electrodes. Cu 2+ + H 2 O O 2 + H + + Cu 25. A solution of potassium iodide is added to an acidified solution of potassium dichromate. I + H + + Cr 2 O 7 2 I 2 + Cr 3+ + H 2 O 26. Hydrogen peroxide solution is added to a solution of iron(ii) sulfate. H 2 O 2 + Fe 2+ Fe 3+ + H 2 O 27. Solid silver is added to a dilute nitric acid (6M) solution. Ag + H + +NO 3 Ag + + NO + H 2 O 28. A solution of formic acid, HCOOH, is oxidized by an acidified solution of potassium dichromate. HCOOH + H + + Cr 2 O 7 2 H 2 O + Cr 3+ + CO A piece of iron is added to a solution of iron(iii) sulfate. Fe + Fe 3+ Fe An acidified solution of potassium permanganate is added to a solution of sodium sulfite. H + + MnO 4 + SO 3 2 Mn 2+ + SO H 2 O 31. A solution of tin(ii) chloride is added to a solution of iron(iii) sulfate. Sn 2+ + Fe 3+ Sn 4+ + Fe Concentrated hydrochloric acid solution is added to solid manganese(iv) oxide and the reactants are heated. H + + Cl + MnO 2 Mn 2+ + Cl 2 + H 2 O 33. A strip of copper is immersed in dilute nitric acid. Cu + H + + NO 3 Cu 2+ + NO + H 2 O 34. Potassium permanganate solution is added to an acidic solution of hydrogen peroxide. MnO 4 + H + + H 2 O 2 Mn 2+ + O 2 + H 2 O 35. Solid copper is added to a dilute nitric acid solution. Cu + H + + NO 3 Cu 2+ + NO + H 2 O 36. Chlorine gas is bubbled into a cold solution of dilute sodium hydroxide. Cl 2 + OH ClO + Cl + H 2 O 37. A solution of potassium permanganate is mixed with an alkaline solution of sodium sulfite. MnO 4 + OH + SO 3 2 SO H 2 O + MnO 4 2 (or MnO 2 ) 38. Solid sodium dichromate is added to an acidified solution of sodium iodide. Na 2 Cr 2 O 7 + H + + I Cr 3+ + I 2 + H 2 O + Na Hydrogen gas is passed over hot iron(iii) oxide. Kristen Henry Jones 6

7 H 2 + Fe 2 O 3 Fe + H 2 O 40. Solutions of potassium iodide and potassium iodate are mixed in acid solution. I + IO 3 + H + I 2 + H 2 O 41. Hydrogen peroxide is added to an acidified solution of sodium bromide. H 2 O 2 + H + + Br Br 2 + H 2 O 42. Chlorine gas is bubbled into a cold, dilute solution of potassium hydroxide. Cl 2 + OH Cl + ClO + H 2 O 43. A solution of iron(ii) nitrate is exposed to air for an extended period of time. Fe 2+ + O 2 Fe 2 O 3 AcidBase Neutralizations 1. Solutions of ammonia and hydrofluoric acid are mixed. NH 3 + HF NH F 2. Hydrogen sulfide gas is bubbled through a solution of potassium hydroxide. H 2 S + OH H 2 O + S 2 3. A solution of sulfuric acid is added to a solution of barium hydroxide until the same number of moles of each compound has been added. H + + SO Ba 2+ + OH H 2 O + BaSO 4 4. A solution of sodium hydroxide is added to a solution of sodium dihydrogen phosphate until the same number of moles of each compound has been added. OH + H 2 PO 4 HPO H 2 O 5. Dilute nitric acid is added to crystals of pure calcium oxide. H + + CaO H 2 O + Ca Equal volumes of 0.1molar sulfuric acid and 0.1molar potassium hydroxide are mixed. H + +OH H 2 O 7. A solution of ammonia is added to a dilute solution of acetic acid. NH 3 + HC 2 H 3 O 2 NH C 2 H 3 O 2 8. Excess sulfur dioxide gas is bubbled through a dilute solution of potassium hydroxide. SO 2 + OH H 2 O + SO Sulfur dioxide gas is bubbled into an excess of a saturated solution of calcium hydroxide. SO 2 + Ca 2+ + OH CaSO 3 + H 2 O 10. A solution of sodium hydroxide is added to a solution of calcium hydrogen carbonate until the number of moles of sodium hydroxide added is twice the number of moles of the calcium salt. OH +Ca 2+ + HCO 3 H 2 O + CaCO Equal volumes of 0.1M hydrochloric acid and 0.1M sodium monohydrogen phosphate are mixed. H + + HPO 4 2 H 2 PO Hydrogen sulfide gas is bubbled through excess potassium hydroxide solution. H 2 S + OH H 2 O + S Ammonia gas and carbon dioxide gas are bubbled into water. NH 3 + CO 2 + H 2 O NH CO Carbon dioxide gas is bubbled through a concentrated solution of sodium hydroxide. CO 2 + OH CO H 2 O 15. Acetic acid solution is added to a solution of sodium hydrogen carbonate. HC 2 H 3 O 2 + HCO 3 H 2 O + CO 2 + C 2 H 3 O 2 Kristen Henry Jones 7

8 16. Excess potassium hydroxide solution is added to a solution of potassium dihydrogen phosphate. OH + H 2 PO 4 H 2 O + PO 4 3 Complex Ions 1. Concentrated (15M) ammonia solution is added in excess to a solution of copper(ii) nitrate. NH 3 + Cu 2+ [Cu(NH 3 ) 4 ] An excess of nitric acid solution is added to a solution of tetraaminecopper(ii) sulfate. H + + [Cu(NH 3 ) 4 ] 2+ NH Cu Dilute hydrochloric acid is added to a solution of diamminesilver(i) nitrate. H + + Cl + [Ag(NH 3 ) 2 ] + AgCl + NH Solid aluminum nitrate is dissolved in water. Al(NO 3 ) 3 + H 2 O [Al(H 2 O) 6 ] +3 + NO 3 5. A suspension of copper(ii) hydroxide is treated with an excess of ammonia water. Cu(OH) 2 + NH 3 [Cu(NH 3 ) 4 ] 2+ + OH 6. A solution of diamminesilver(i) chloride is treated with dilute nitric acid. [Ag(NH 3 ) 2 ] + + Cl + H + NH AgCl 7. An excess of concentrated ammonia solution is added to freshly precipitated copper(ii) hydroxide. NH 3 + Cu(OH) 2 [Cu(NH 3 ) 4 ] 2+ + OH 8. Excess dilute nitric acid is added to a solution containing the tetraaminecadmium(ii) ion. H + + [Cd(NH 3 ) 4 ] 2+ NH Cd An excess of ammonia is bubbled through a solution saturated with silver chloride. NH 3 + Ag + [Ag(NH 3 ) 2 ] Solid aluminum oxide is added to a solution of sodium hydroxide. Al 2 O 3 + OH [Al(OH) 4 ] (may have water as a reactant) 11. A concentrated solution of ammonia is added to a solution of zinc iodide. NH 3 + Zn 2+ [Zn(NH 3 ) 4 ] An excess of sodium hydroxide solution is added to a solution of aluminum chloride. OH + Al 3+ [Al(OH) 4 ] 13. A concentrated solution of ammonia is added to a solution of copper(ii) chloride. NH 3 + Cu 2+ [Cu(NH 3 ) 4 ] Excess concentrated sodium hydroxide solution is added to solid aluminum hydroxide. OH + Al(OH) 3 [Al(OH) 4 ] 15. Excess concentrated ammonia solution is added to a suspension of silver chloride. NH 3 + AgCl [Ag(NH 3 ) 2 ] + + Cl 16. Pellets of aluminum metal are added to a solution containing an excess of sodium hydroxide. Al + OH [Al(OH) 4 ] 17. A suspension of zinc hydroxide is treated with concentrated sodium hydroxide solution. Zn(OH) 2 + OH [Zn(OH) 4 ] Silver chloride is dissolved in excess ammonia solution. AgCl + NH 3 [Ag(NH 3 ) 2 ] + + Cl 19. Sodium hydroxide solution is added to a precipitate of aluminum hydroxide in water. OH + Al(OH) 3 [Al(OH) 4 ] 20. A drop of potassium thiocyanate is added to a solution of iron(iii) chloride. Kristen Henry Jones 8

9 SCN + Fe 3+ FeSCN A concentrated solution of ammonia is added to a suspension of zinc hydroxide. NH 3 + Zn(OH) 2 [Zn(NH 3 ) 4 ] 2+ + OH 22. Excess concentrated potassium hydroxide solution is added to a precipitate of zinc hydroxide. Zn(OH) 2 + OH [Zn(OH) 4 ] 2 Addition 1. The gases boron trifluoride and ammonia are mixed. BF 3 + NH 3 F 3 BNH 3 2. A mixture of solid calcium oxide and solid tetraphosphorus decaoxide is heated. CaO + P 4 O 10 Ca 3 (PO 4 ) 2 3. Solid calcium oxide is exposed to a stream of carbon dioxide gas. CaO + CO 2 CaCO 3 4. Solid calcium oxide is heated in the presence of sulfur trioxide gas. CaO + SO 3 CaSO 4 5. Calcium metal is heated strongly in nitrogen gas. Ca + N 2 Ca 3 N 2 6. Excess chlorine gas is passed over hot iron filings. Cl 2 + Fe FeCl 3 7. Powdered magnesium oxide is added to a container of carbon dioxide gas. MgO + CO 2 MgCO 3 8. A piece of lithium metal is dropped into a container of nitrogen gas. Li + N 2 Li 3 N 9. Magnesium metal is burned in nitrogen gas. Mg + N 2 Mg 3 N Sulfur dioxide gas is passed over solid calcium oxide. SO 2 + CaO CaSO 3 Decomposition 1. A solution of hydrogen peroxide is heated. H 2 O 2 O 2 + H 2 O 2. Solid magnesium carbonate is heated. MgCO 3 MgO + CO 2 3. A solution of hydrogen peroxide is catalytically decomposed. H 2 O 2 H 2 O + O 2 Kristen Henry Jones 9

10 4. Solid potassium chlorate is heated in the presence of manganese dioxide as a catalyst. KClO 3 MnO 2 KCl + O 2 5. Sodium hydrogen carbonate is dissolved in water. NaHCO 3 Na + + HCO 3 6. Solid ammonium carbonate is heated. (NH 4 ) 2 CO 3 CO 2 + NH 3 + H 2 O ORGANIC 1. A sample of pure 2butene is treated with hydrogen bromide gas. C 4 H 8 + HBr C 4 H 9 Br 2. An excess of chlorine gas is added to pure acetylene. Cl 2 + C 2 H 2 C 2 H 2 Cl 4 3. Ethyl acetate is treated with a solution of sodium hydroxide. CH 3 COOC 2 H 5 + OH C 2 H 5 OH + CH 3 COO 4. Benzene is treated with bromine in the presence of a catalyst. Br 2 + C 6 H 6 C 6 H 5 Br + HBr 5. Propene reacts with water in the presence of a catalyst. C 3 H 6 + H 2 O C 3 H 7 OH 6. Methyl iodide is heated with a solution of sodium hydroxide. CH 3 I + OH CH 3 OH + I 7. Methane gas is heated with an excess of chlorine gas. CH 4 + Cl 2 CH 3 Cl + HCl 8. Ethanol and formic acid (methanoic acid) are mixed and warmed. C 2 H 5 OH + HCOOH HCOOC 2 H 5 + H 2 O 9. Ethene (ethylene) gas is bubbled through a solution of bromine. C 2 H 4 + Br 2 C 2 H 4 Br 2 Kristen Henry Jones 10

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