Chem Exam 4 Review

Chapter 9 - Which of these compounds is a strong electrolyte?

• H₂O

• N₂

• CH₃COOH (acetic acid)

• C₂H₆O (ethanol)

• KOH

Chapter 9 - Which of these compounds is a weak electrolyte?

• HCl

• CH3COOH (acetic acid)

• C6H12O6 (glucose)

• O₂

• NaCl

Chapter 9 - Which of these chemical equations describes a precipitation reaction?

• 2H2(g) + O2(g) → 2H2O(l)

• CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g)

• 2KNO3(s) → 2KNO2(s) + O2(g)

• 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l)

• 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)

Chapter 9 - which chemical equation describes an acid-base neutralization reaction?

• 2Al(s)+ 3H2SO4(aq) → Al2 (SO4)3 (aq) + 3H2(g)

• 2SO2(g) + 2H2O(l) + O2(g) → 2H2SO4(aq)

• LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l)

• 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l)

• CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g)

Chapter 9 - Which of these chemical equations describes a metal displacement reaction?

• 2NaN3(s) → 2Na(s) + 3N2(g)

• Fe2O3(s) + 2Al(s) → 2Fe(s) + Al2O3(s)

• 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

• 2P(s) + 3Cl2(g) → 2PCl3(g)

• 2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g)

Based on the solubility rules, which of these processes will occur when solutions of ZnSO₄(aq) and MgCl₂(aq) are mixed?

• ZnCl2 will precipitate; Mg2+ and SO42– are spectator ions

• 
  ZnSO4 will precipitate; Mg2+ and Cl– are spectator ions

• MgSO4 will precipitate; Zn2+ and Cl– are spectator ions

• 
  MgCl2 will precipitate; Zn2+ and SO42–are spectator ions

• No precipitate will form

Which of the following is soluble in water?

• AgCl

• Rb2CrO4

• Hg2I2

• CaSO4

• Pbbr2

Identify the net ionic equation for the following reaction:

2NaCl(aq) + Hg2(NO3)2(aq) → 2NaNO3(aq) + Hg2Cl2(s)

• Na+(aq) + NO3–(aq) → NaNO3(aq)

• 
  Hg22+(aq) + 2Cl–(aq) → Hg2Cl2(s)

• 2Hg+(aq) + 2Cl–(aq) → 2HgCl(s)

• Hg2(NO3)2(aq) → Hg22+(aq) + 2NO3–(aq)

• Hg22+(aq) → Hg2(s)

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3)2 are mixed.

• K+(aq) + NO3-(aq) → KNO3(s)

• Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO3-(aq) → FeS(s) + 2 K+(aq) + 2 NO3-(aq)

• Fe2+(aq) + S2-(aq) + 2 K+(aq) + 2 NO3-(aq) → Fe2+(aq) + S2-(aq) + 2 KNO3(s)

• Fe2+(aq) + S2-(aq) → FeS(s)

• No reaction occurs.

If aqueous solutions of Mg(C2H3O2)2 and Li OH are mixed, which insoluble precipitate is formed?

• LiC2H3O2

• Li(C2H3O2)2

• MgOH

• 
  Mg(OH)2

• CH3OH