Question 1

In basic solution the chromate ion,CrO42-,can be converted to the chromite,CrO2-,ion.The number of electrons gained or lost by the chromium atom is

Accepted Answer

A) 0. 
B) 3 electrons lost. 
C) 2 electrons lost. 
D) 3 electrons gained. 
E) 2 electrons gained. 
A) 0. 
B) 3 electrons lost. 
C) 2 electrons lost. 
D) 3 electrons gained. 
E) 2 electrons gained.

Question 2

All of the following reactions are called combination reactions except

Accepted Answer

A) BaO(s)+ SO2(g)→ BaSO3(s). 
B) C6H10(l)+ Br2(l)→ C6H10Br2(l). 
C) Br2(l)+ H2O(l)→ HOBr(aq)+ HBr(aq). 
D) CaCl2(s)+ 6H2O(l)→ CaCl2 • 6H2O(s). 
E) 3H2(g)+ N2(g)→ 2NH3(g). 
A) BaO(s)+ SO2(g)→ BaSO3(s). 
B) C6H10(l)+ Br2(l)→ C6H10Br2(l). 
C) Br2(l)+ H2O(l)→ HOBr(aq)+ HBr(aq). 
D) CaCl2(s)+ 6H2O(l)→ CaCl2 • 6H2O(s). 
E) 3H2(g)+ N2(g)→ 2NH3(g).

Question 3

Which net ionic equation best represents the reaction that occurs when an aqueous solution of lithium nitrate is mixed with an aqueous solution of ammonium chloride?

Accepted Answer

A) Li+(aq)+ Cl-(aq)→ LiCl(s) 
B) NH4+(aq)+ NO3-(aq)→ NH4NO3(aq) 
C) NH4Cl(aq)+ LiNO3(aq)→ LiCl(s)+ NH4NO3(aq) 
D) No net reaction occurs. 
E) Li+(aq)+ NH4Cl(aq)→ LiCl(s)+ NH4+(aq) 
A) Li+(aq)+ Cl-(aq)→ LiCl(s) 
B) NH4+(aq)+ NO3-(aq)→ NH4NO3(aq) 
C) NH4Cl(aq)+ LiNO3(aq)→ LiCl(s)+ NH4NO3(aq) 
D) No net reaction occurs. 
E) Li+(aq)+ NH4Cl(aq)→ LiCl(s)+ NH4+(aq)

Question 4

Which of the following is a weak electrolyte in aqueous solution?

Accepted Answer

A) Ca(OH)2 
B) NH3 
C) LiOH 
D) RbOH 
E) Sr(OH)2 
A) Ca(OH)2 
B) NH3 
C) LiOH 
D) RbOH 
E) Sr(OH)2

Question 5

In the balanced equation
3Na+(aq)+ 3OH-(aq)+ P4(s)+ 3H2O(l)→ 3Na+(aq)+ 3H2PO2-(aq)+ PH3(g)
What is the reducing agent?

Accepted Answer

A) OH- 
B) Na+ 
C) H2O 
D) P4 
E) PH3 
A) OH- 
B) Na+ 
C) H2O 
D) P4 
E) PH3

Question 6

Which of the following best represents the molecular equation for the reaction of aqueous ammonia with sulfuric acid?

Accepted Answer

A) 2NH3(aq)+ H2SO4(aq)→ (NH4)2SO4(aq) 
B) NH3(aq)+ H2SO4(aq)→ NH4SO4(aq) 
C) NH4OH(aq)+ H2SO4(aq)→ NH4SO4(aq)+ H2O(l) 
D) 2NH4+(aq)+ H2SO4(aq)→ (NH4)2SO4(aq)+ 2H+(aq) 
E) 2NH4+(aq)+ H2SO4(aq)→ (NH4)2SO4(aq)+ H2(g) 
A) 2NH3(aq)+ H2SO4(aq)→ (NH4)2SO4(aq) 
B) NH3(aq)+ H2SO4(aq)→ NH4SO4(aq) 
C) NH4OH(aq)+ H2SO4(aq)→ NH4SO4(aq)+ H2O(l) 
D) 2NH4+(aq)+ H2SO4(aq)→ (NH4)2SO4(aq)+ 2H+(aq) 
E) 2NH4+(aq)+ H2SO4(aq)→ (NH4)2SO4(aq)+ H2(g)

Question 7

Which of the following is a nonelectrolyte in aqueous solution?

Accepted Answer

A) NH4F 
B) NH4Cl 
C) NaHS 
D) CH4 
E) Na2S 
A) NH4F 
B) NH4Cl 
C) NaHS 
D) CH4 
E) Na2S

Question 8

Which of the following salts cannot be obtained by the neutralization of a strong acid and a strong base?

Accepted Answer

A) NaCl 
B) LiNO3 
C) NH4Br 
D) Ba(ClO4)2 
E) Na2SO4 
A) NaCl 
B) LiNO3 
C) NH4Br 
D) Ba(ClO4)2 
E) Na2SO4

Question 9

What is the net ionic equation for the acid-base reaction that occurs when an excess of a sodium hydroxide solution is added to a solution of H2SO3?

Accepted Answer

A) H2SO3(aq)+ 2OH-(aq)→ 2H2O(l)+ SO32-(aq) 
B) H+(aq)+ OH-(aq)→ H2O(l) 
C) 2H+(aq)+ 2OH-(aq)→ 2H2O(l) 
D) 2H+(aq)+ SO32-(aq)+ 2Na+(aq)+ 2OH-(aq)→ 2Na+(aq)+ SO32-(aq)+ 2H2O(l) 
E) H2SO3(aq)+ 2NaOH(aq)→ Na2SO3(aq)+ 2H2O(l) 
A) H2SO3(aq)+ 2OH-(aq)→ 2H2O(l)+ SO32-(aq) 
B) H+(aq)+ OH-(aq)→ H2O(l) 
C) 2H+(aq)+ 2OH-(aq)→ 2H2O(l) 
D) 2H+(aq)+ SO32-(aq)+ 2Na+(aq)+ 2OH-(aq)→ 2Na+(aq)+ SO32-(aq)+ 2H2O(l) 
E) H2SO3(aq)+ 2NaOH(aq)→ Na2SO3(aq)+ 2H2O(l)

Question 10

What mass of oxalic acid dihydrate,H2C2O4 · 2H2O,is required to prepare 220.0 mL of a 1.58 M solution of oxalic acid?

Accepted Answer

A) 126 g 
B) 43.8 g 
C) 142 g 
D) 199 g 
E) 31.2 g 
A) 126 g 
B) 43.8 g 
C) 142 g 
D) 199 g 
E) 31.2 g

Question 11

A precipitate is expected when an aqueous solution of lithium iodide is added to an aqueous solution of

Accepted Answer

A) calcium nitrate. 
B) barium hydroxide. 
C) lead perchlorate. 
D) iron(II)chloride. 
E) sodium sulfate. 
A) calcium nitrate. 
B) barium hydroxide. 
C) lead perchlorate. 
D) iron(II)chloride. 
E) sodium sulfate.

Question 12

In the following reaction,
2H2O2(l)→ 2H2O(l)+ O2(g)
Hydrogen peroxide functions as

Accepted Answer

A) an acid. 
B) a reducing agent. 
C) an oxidizing agent. 
D) both an oxidizing agent and a reducing agent. 
E) neither an oxidizing agent nor a reducing agent. 
A) an acid. 
B) a reducing agent. 
C) an oxidizing agent. 
D) both an oxidizing agent and a reducing agent. 
E) neither an oxidizing agent nor a reducing agent.

Question 13

Besides its ability to function as an acid,hydrosulfuric acid,H2S,is able to act as a reducing agent.Which one of the following equations illustrates this property of H2S?

Accepted Answer

A) H2S(aq)+ 2OH-(aq)→ S2-(aq)+ 2H2O(l) 
B) H2S(aq)+ 2Na(s)→ H2(g)+ 2Na+(aq)+ S2-(aq) 
C) H2S(aq)+ 2AgI(s)→ Ag2S(s)+ 2H+(aq)+ 2I-(aq) 
D) H2S(aq)+ Cu2+(aq)→ CuS(s)+ 2H+(aq) 
E) 3H2S(aq)+ 2H+(aq)+ 2NO3-(aq)→ 3S(s)+ 2NO(g)+ 4H2O(l) 
A) H2S(aq)+ 2OH-(aq)→ S2-(aq)+ 2H2O(l) 
B) H2S(aq)+ 2Na(s)→ H2(g)+ 2Na+(aq)+ S2-(aq) 
C) H2S(aq)+ 2AgI(s)→ Ag2S(s)+ 2H+(aq)+ 2I-(aq) 
D) H2S(aq)+ Cu2+(aq)→ CuS(s)+ 2H+(aq) 
E) 3H2S(aq)+ 2H+(aq)+ 2NO3-(aq)→ 3S(s)+ 2NO(g)+ 4H2O(l)

Question 14

When a solution of lithium chloride and a solution of ammonium sulfate are mixed,

Accepted Answer

A) a new salt is formed. 
B) no reaction occurs. 
C) a precipitate forms. 
D) an acid and a base are formed. 
E) a gas is evolved. 
A) a new salt is formed. 
B) no reaction occurs. 
C) a precipitate forms. 
D) an acid and a base are formed. 
E) a gas is evolved.

Question 15

Identify the spectator ions in the following reaction.
Ca2+(aq)+ 2NO3-(aq)+ 2Na+(aq)+ CO32-(aq)→ CaCO3(s)+ 2Na+(aq)+ NO3-(aq)

Accepted Answer

A) NO3- and CO32- 
B) Ca2+ and Na+ 
C) Ca2+ and CO32- 
D) Ca2+ and NO3- 
E) Na+ and NO3- 
A) NO3- and CO32- 
B) Ca2+ and Na+ 
C) Ca2+ and CO32- 
D) Ca2+ and NO3- 
E) Na+ and NO3-

Question 16

In which one of the following is the oxidation number of nitrogen given incorrectly?

Accepted Answer

A) N2H4 (-2) 
B) NaN3 (-1) 
C) HNO2 (+3) 
D) N2O3 (+3) 
E) H2N2O2 (+1) 
A) N2H4 (-2) 
B) NaN3 (-1) 
C) HNO2 (+3) 
D) N2O3 (+3) 
E) H2N2O2 (+1)

Question 17

Which of the following solutions would be expected to be the best conductor of an electric current at room temperature?

Accepted Answer

A) 0.10 M Na2SO4 
B) 1.0 M CH3COOH 
C) 0.10 M NaCl 
D) 0.10 M CO(NH2)2 
E) 0.10 M CH3COOH 
A) 0.10 M Na2SO4 
B) 1.0 M CH3COOH 
C) 0.10 M NaCl 
D) 0.10 M CO(NH2)2 
E) 0.10 M CH3COOH

Question 18

Which of the following species cannot function as an oxidizing agent?

Accepted Answer

A) S 
B) Br- 
C) H+ 
D) MnO4- 
E) Mn2+ 
A) S 
B) Br- 
C) H+ 
D) MnO4- 
E) Mn2+

Question 19

What is the net ionic equation for the reaction of hydrochloric acid with lithium hydroxide?

Accepted Answer

A) H+(aq)+ OH-(aq)→ H2O(l) 
B) H+(aq)+ Cl-(aq)+ Li+(aq)+ OH-(aq)→ LiCl(aq)+ H2O(l) 
C) H+(aq)+ Cl-(aq)+ Li+(aq)+ OH-(aq)→ HCl(aq)+ LiOH(aq) 
D) HCl(aq)+ Li+(aq)+ OH-(aq)→ LiCl(aq)+ H2O(l) 
E) HCl(aq)+ LiOH(aq)→ LiCl(aq)+ H2O(l) 
A) H+(aq)+ OH-(aq)→ H2O(l) 
B) H+(aq)+ Cl-(aq)+ Li+(aq)+ OH-(aq)→ LiCl(aq)+ H2O(l) 
C) H+(aq)+ Cl-(aq)+ Li+(aq)+ OH-(aq)→ HCl(aq)+ LiOH(aq) 
D) HCl(aq)+ Li+(aq)+ OH-(aq)→ LiCl(aq)+ H2O(l) 
E) HCl(aq)+ LiOH(aq)→ LiCl(aq)+ H2O(l)

Question 20

In the reaction of acetic acid with aqueous cesium hydroxide,what is the spectator ion?

Accepted Answer

A) OH-(aq) 
B) There is no spectator ion. 
C) C2H3O2-(aq) 
D) Cs+(aq) 
E) H+(aq) 
A) OH-(aq) 
B) There is no spectator ion. 
C) C2H3O2-(aq) 
D) Cs+(aq) 
E) H+(aq)

Exam 4: Chemical Reactions

In basic solution the chromate ion,CrO42-,can be converted to the chromite,CrO2-,ion.The number of electrons gained or lost by the chromium atom is

All of the following reactions are called combination reactions except

Which net ionic equation best represents the reaction that occurs when an aqueous solution of lithium nitrate is mixed with an aqueous solution of ammonium chloride?

Which of the following is a weak electrolyte in aqueous solution?

In the balanced equation 3Na+(aq)+ 3OH-(aq)+ P4(s)+ 3H2O(l)→ 3Na+(aq)+ 3H2PO2-(aq)+ PH3(g) What is the reducing agent?

Which of the following best represents the molecular equation for the reaction of aqueous ammonia with sulfuric acid?

Which of the following is a nonelectrolyte in aqueous solution?

Which of the following salts cannot be obtained by the neutralization of a strong acid and a strong base?

What is the net ionic equation for the acid-base reaction that occurs when an excess of a sodium hydroxide solution is added to a solution of H2SO3?

What mass of oxalic acid dihydrate,H2C2O4 · 2H2O,is required to prepare 220.0 mL of a 1.58 M solution of oxalic acid?

A precipitate is expected when an aqueous solution of lithium iodide is added to an aqueous solution of

In the following reaction, 2H2O2(l)→ 2H2O(l)+ O2(g) Hydrogen peroxide functions as

Besides its ability to function as an acid,hydrosulfuric acid,H2S,is able to act as a reducing agent.Which one of the following equations illustrates this property of H2S?

When a solution of lithium chloride and a solution of ammonium sulfate are mixed,

Identify the spectator ions in the following reaction. Ca2+(aq)+ 2NO3-(aq)+ 2Na+(aq)+ CO32-(aq)→ CaCO3(s)+ 2Na+(aq)+ NO3-(aq)

In which one of the following is the oxidation number of nitrogen given incorrectly?

Which of the following solutions would be expected to be the best conductor of an electric current at room temperature?

Which of the following species cannot function as an oxidizing agent?

What is the net ionic equation for the reaction of hydrochloric acid with lithium hydroxide?

In the reaction of acetic acid with aqueous cesium hydroxide,what is the spectator ion?

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In basic solution the chromate ion,CrO₄^2-,can be converted to the chromite,CrO₂^-,ion.The number of electrons gained or lost by the chromium atom is

In the balanced equation 3Na⁺(aq)+ 3OH^-(aq)+ P₄(s)+ 3H₂O(l)→ 3Na⁺(aq)+ 3H₂PO₂^-(aq)+ PH₃(g) What is the reducing agent?

What is the net ionic equation for the acid-base reaction that occurs when an excess of a sodium hydroxide solution is added to a solution of H₂SO₃?

What mass of oxalic acid dihydrate,H₂C₂O₄ · 2H₂O,is required to prepare 220.0 mL of a 1.58 M solution of oxalic acid?

In the following reaction, 2H₂O₂(l)→ 2H₂O(l)+ O₂(g) Hydrogen peroxide functions as

Besides its ability to function as an acid,hydrosulfuric acid,H₂S,is able to act as a reducing agent.Which one of the following equations illustrates this property of H₂S?

Identify the spectator ions in the following reaction. Ca²⁺(aq)+ 2NO₃^-(aq)+ 2Na⁺(aq)+ CO₃^2-(aq)→ CaCO₃(s)+ 2Na⁺(aq)+ NO₃^-(aq)