Types of Reactions CHEM 10 Review Worksheet The questions on this worksheet are both Chem 10 and Chem 11 level problems. They are provided to assist your review of some topics covered in Chp 4 of the Zumdahl textbook. A partial answer key is provided at the end of this worksheet.
Combination and Decomposition Reactions 1. Write the generic equation for a combination reaction. Which (if any) of the reactions on the CHP 3 Equations Review Worksheet could be classified as combination reactions?
2. Write the generic equation for a decomposition reaction. Which (if any) of the reactions on the CHP 3 Equations Review Worksheet could be classified as decomposition reactions?
Combustion Reactions 3. Write the generic equation for a combustion reaction involving a hydrocarbon reactant. Which (if any) of the reactions on the CHP 3 Equations Review Worksheet could be classified as combustions of hydrocarbons?
4. Write the balanced equations for the combustion reactions of the following hydrocarbons: a. liquid propanol ( in rubbing alcohol, C3H8O).
b. liquid butane (in cigarette lighters, C4H10).
The Solubility of Ionic Compounds 5. In the presence of water, what will be the state of: a soluble ionic compound?
an insoluble ionic compound?
6. Use your solubility rules to determine which of the following ionic compounds are soluble in water and which are insoluble in water. Rb3PO4
Fe(OH)3
AgI
CuSO4
MgCrO4
Sn(C2H3O2)2
NH4ClO3
ZnS
Single Displacement Reactions 7. Write the generic equations for single displacement reactions involving (a) a metal, and (b) a non-metal. Which (if any) of the reactions on CHP 3 Equations Review Worksheet could be classified as single displacement reactions?
8. For each of the following sets of reactants: • •
determine whether or not a single displacement reaction would occur, if a reaction does occur, predict the names and states of the products, then write the balanced molecular equation for the reaction.
a. Aluminum metal + aqueous lead(II) nitrate
Does a reaction occur?
Product Names and States: Molecular Equation: b. Nickel metal + hydrobromic acid
Does a reaction occur?
Product Names and States: Molecular Equation: c. Tin metal + aqueous calcium acetate
Does a reaction occur?
Product Names and States: Molecular Equation: d. Zinc metal + phosphoric acid
Does a reaction occur?
Product Names and States: Molecular Equation: e. Copper metal + aqueous gold(III) sulfate
Does a reaction occur?
Product Names and States: Molecular Equation: f.
Lithium metal + water
Does a reaction occur?
Product Names and States: Molecular Equation: 9. What are two likely observations you would make if you saw a single displacement reaction occur in the lab?
Double Displacement Reactions 10. Write the generic equation for a double displacement reaction. Which (if any) of the reactions on the CHP 3 Equations Review Worksheet could be classified as double displacement reactions?
11. Determine whether a precipitation reaction would occur for the following sets of reactants. If yes: • • • •
predict the names and states of the products, write the balanced molecular equation for the reaction, circle the precipitate in the balanced equation, and write the complete ionic and net ionic equations for the reaction.
a. Aqueous ammonium sulfide + aqueous copper(II) nitrate
Does a reaction occur?
Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: b. Aqueous iron(III) chloride + aqueous sodium carbonate
Does a reaction occur?
Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: c. Aqueous zinc iodide + aqueous lithium sulfate
Does a reaction occur?
Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: d. Aqueous potassium chromate + aqueous lead(II) nitrate Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation:
Does a reaction occur?
e. Aqueous barium nitrate + sulfuric acid
Does a reaction occur?
Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: f.
Aqueous cobalt(III) bromide + aqueous silver acetate
Does a reaction occur?
Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: 12. For each of the following neutralization reactions: • predict the names and states of the products, • write the balanced molecular equation for the reaction, • write the complete ionic and net ionic equations for the reaction. a. Aqueous barium hydroxide + acetic acid Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: b. Phosphoric acid + aqueous sodium hydroxide Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: c. Aqueous lithium hydroxide + nitric acid Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation:
13. For each of the following gas-forming reactions: • predict the names and states of the products, • write the balanced molecular equation for the reaction, • write the complete ionic and net ionic equations for the reaction. a. Hydrochloric acid + solid calcium sulfite Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: b. Aqueous potassium carbonate + oxalic acid Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: c. Aqueous sodium hydroxide + aqueous ammonium nitrate Product Names and States: Molecular Equation: Complete Ionic Equation: Net Ionic Equation: 14. In lab, what observations would you make if: -- a precipitation reaction occurred? -- a neutralization reaction occurred? -- a gas-forming reaction occurred?
Partial Answer Key Combination and Decomposition Reactions 1. A + B → AB Reactions 3, 10 and 12 from the CHP 3 Review Worksheet are combination reactions. 2. AB → A + B Reactions 4, 9 and 16 from the CHP 3 Review Worksheet are decomposition reactions. Combustion Reactions 3. CxHy + O2 → CO2 + H2O Reactions 6 and 17 from the CHP 3 Review Worksheet are combustion reactions of hydrocarbons. 4. Write the balanced equations for the combustion reactions of the following hydrocarbons: a. 2 C3H8O (l) + 9 O2 (g) → 6 CO2 (g) + 8 H2O (l) b. 2 C4H10 (l) + 13 O2 (g) → 8 CO2 (g) + 10 H2O (l) The Solubility of Ionic Compounds 5. A soluble ionic compound will dissolve and be in the aqueous state if water is added. An insoluble ionic compound will not dissolve and thus remains in the solid state if water is added. 6. Rb3PO4 – soluble | Fe(OH)3 – insoluble | AgI – insoluble | CuSO4 – soluble MgCrO4 – insoluble | Sn(C2H3O2)2 – soluble | NH4ClO3 – soluble | ZnS – insoluble Single Displacement Reactions 7. For reactions involving metals: A + BC → AC + B For reactions involving non-metals: X + BC → BX + C Reactions 2, 7, 11 and 15 from the CHP 3 Review Worksheet are single displacement reactions. 8. a. b. c. d. e. f.
Only the balanced molecular equations are supplied here. 2 Al (s) + 3 Pb(NO3)2 (aq) → 3 Pb (s) + 2 Al(NO3)3 (aq) Ni (s) + 2 HBr (aq) → H2 (g) + NiBr2 (aq) Sn (s) + Ca(C2H3O2)2 (aq) → no reaction, tin is less active than calcium 3 Zn (s) + 2 H3PO4 (aq) → 3 H2 (g) + Zn3(PO4)2 (s) 3 Cu (s) + Au2(SO4)3 (aq) → 2 Au (s) + 3 CuSO4 (aq) 2 Li (s) + 2 H2O (l) → H2 (g) + 2 LiOH (aq)
9. If hydrogen gas is produced, it will be observed as the appearance of bubbles. If a new metal is produced, it will be observed as the appearance a metallic deposit. Double Displacement Reactions 10. AB + CD → AD + CB Reactions 5, 8, 14 and 18 from the CHP 3 Review Worksheet are double displacement reactions. 11. a. b. c. d. e. f.
Only the balanced molecular equations are supplied here. (NH4)2S (aq) + Cu(NO3)2 (aq) → 2 NH4NO3 (aq) + CuS (s) 2 FeCl3 (aq) + 3 Na2CO3 (aq) → Fe2(CO3)3 (s) + 6 NaCl (aq) ZnI2 (aq) + Li2SO4 (aq) → no reaction, products are both soluble salts K2CrO4 (aq) + Pb(NO3)2 (aq) → 2 KNO3 (aq) + PbCrO4 (s) Ba(NO3)2 (aq) + H2SO4 (aq) → BaSO4 (s) + 2 HΝΟ3 (aq) CoBr3 (aq) + 3 AgC2H3O2 (aq) → Χο(C2H3O2)3 (aq) + 3 AgBr (s)
12. a. b. c.
Only the balanced molecular equations are supplied here. Ba(OH)2 (aq) + 2 HC2H3O2 (aq) → 2 H2O (l) + Ba(C2H3O2)2 (aq) H3PO4 (aq) + 3 NaOH (aq) → 3 H2O (l) + Na3PO4 (aq) LiOH (aq) + HNO3 (aq) → H2O (l) + LiNO3 (aq)
13. a. b. c.
Only the balanced molecular equations are supplied here. 2 HCl (aq) + CaSO3 (s) → CaCl2 (aq) + H2O (l) + SO2 (g) K2CO3 (aq) + H2C2O4 (aq) → K2C2O4 (aq) + H2O (l) + CO2 (g) NaOH (aq) + NH4NO3 (aq) → NaNO3 (aq) + H2O (l) + NH3 (g)
14. Observations for a: (1) Precipitation reaction = A precipitate would form. A precipitate appears as many, many tiny particles of solid that are dispersed throughout the solution. Often they cause the solution to appear cloudy, or opaque. Over time, a precipitate will settle to the bottom of the container. (2) Neutralization reaction = Usually no visible signs occur, however, since these reactions are exothermic the reaction container will become warm to the touch. (3) Gas-forming reaction = Bubbles would appear.
