Question 1

What element is undergoing oxidation (if any)in the following reaction?
CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(g)

Accepted Answer

A) O 
B) H 
C) C 
D) both C and H 
E) None of the elements is undergoing oxidation. 
A) O 
B) H 
C) C 
D) both C and H 
E) None of the elements is undergoing oxidation.

Question 2

A solution is prepared by adding 1.60 g of solid NaCl to 50.0 mL of 0.100 M CaCl2.What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL.

Accepted Answer

A) 0.747 
B) 0.647 
C) 0.132 
D) 0.232 
E) 0.547 
A) 0.747 
B) 0.647 
C) 0.132 
D) 0.232 
E) 0.547

Question 3

Based on the balanced chemical equation shown below,determine the mass percent of Fe3+ in a 0.7450 g sample of iron ore,if 22.40 mL of a 0.1000 M stannous chloride,SnCl2(aq),solution is required to completely react with the Fe3+ present in the ore sample.The chemical equation for the reaction is
2 Fe3+(aq)+ Sn2+(aq)→ 2 Fe2+(aq)+ Sn4+(aq).

Accepted Answer

A) 5.365% 
B) 8.396% 
C) 16.79% 
D) 33.58% 
A) 5.365% 
B) 8.396% 
C) 16.79% 
D) 33.58%

Question 4

Which of the following compounds is soluble in water?

Accepted Answer

A) CaS 
B) MgCO3 
C) PbCl2 
D) BaSO4 
E) None of these compounds is soluble in water. 
A) CaS 
B) MgCO3 
C) PbCl2 
D) BaSO4 
E) None of these compounds is soluble in water.

Question 5

Lithium and nitrogen react to produce lithium nitride:
6Li(s)+ N2(g)→ 2Li3N(s)
How many moles of lithium nitride are produced when 0.450 mol of lithium react in the presence of excess nitrogen?

Accepted Answer

A) 0.150 
B) 0.900 
C) 0.0750 
D) 1.35 
E) 0.225 
A) 0.150 
B) 0.900 
C) 0.0750 
D) 1.35 
E) 0.225

Question 6

Which of the following is a precipitation reaction?

Accepted Answer

A) Zn(s)+ 2 AgNO3(aq)→ 2 Ag(s)+ Zn(NO3)2(aq) 
B) NaCl(aq)+ LiI(aq)→ NaI(aq)+ LiCl(aq) 
C) 2 LiI(aq)+ Hg2(NO3)2(aq)→ Hg2I2(s)+ 2 LiNO3(aq) 
D) HCl(aq)+ KOH(aq)→ KCl(aq)+ H2O(l) 
E) None of the above are precipitation reactions. 
A) Zn(s)+ 2 AgNO3(aq)→ 2 Ag(s)+ Zn(NO3)2(aq) 
B) NaCl(aq)+ LiI(aq)→ NaI(aq)+ LiCl(aq) 
C) 2 LiI(aq)+ Hg2(NO3)2(aq)→ Hg2I2(s)+ 2 LiNO3(aq) 
D) HCl(aq)+ KOH(aq)→ KCl(aq)+ H2O(l) 
E) None of the above are precipitation reactions.

Question 7

What are the coefficients in front of NO3-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution:
____ NO3-(aq)+ ____ Cu(s)→ ____ NO(g)+ ____ Cu2+(aq)?

Accepted Answer

A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6 
A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6

Question 8

If the density of ethanol,C2H5OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation?
C2H5OH(l)+ 3 O2(g)→ 2 CO2(g)+ 3 H2O(l)

Accepted Answer

A) 6.19 mL 
B) 9.95 mL 
C) 19.9 mL 
D) 39.8 mL 
A) 6.19 mL 
B) 9.95 mL 
C) 19.9 mL 
D) 39.8 mL

Question 9

How many moles of CO2+ are present in 0.150 L of a 0.200 M solution of CoI2?

Accepted Answer

Question 10

Give the oxidation state for S in SO3-2.

Accepted Answer

A) +4 
B) +6 
C) -2 
D) +2 
E) +5 
A) +4 
B) +6 
C) -2 
D) +2 
E) +5

Question 11

Which of the following pairs of aqueous solutions will react to produce a precipitate?

Accepted Answer

A) LiOH + Na2S 
B) (NH4)2SO4 + LiCl 
C) Sr(C2H3O2)2 + Na2SO4 
D) KNO3 + NaOH 
E) None of the above solution pairs will produce a precipitate. 
A) LiOH + Na2S 
B) (NH4)2SO4 + LiCl 
C) Sr(C2H3O2)2 + Na2SO4 
D) KNO3 + NaOH 
E) None of the above solution pairs will produce a precipitate.

Question 12

Determine the theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl3 = 117.16 g/mol.
BCl3(g)+ 3 H2O(l)→ H3BO3(s)+ 3 HCl(g)

Accepted Answer

A) 75.9 g HCl 
B) 132 g HCl 
C) 187 g HCl 
D) 56.0 g HCl 
E) 25.3 g HCl 
A) 75.9 g HCl 
B) 132 g HCl 
C) 187 g HCl 
D) 56.0 g HCl 
E) 25.3 g HCl

Question 13

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of MgSO3 and HI are mixed.

Accepted Answer

A) 2 H+(aq)+ SO32-(aq)→ H2SO3(s) 
B) Mg2+(aq)+ 2 I-(aq)→ MgI2(s) 
C) 2 H+(aq)+ SO32-(aq)+ Mg2+(aq)+ 2 I-(aq)→ H2SO3(s)+ MgI2(aq) 
D) 2 H+(aq)+ SO32-(aq)→ H2O(l)+ SO2(g) 
E) No reaction occurs. 
A) 2 H+(aq)+ SO32-(aq)→ H2SO3(s) 
B) Mg2+(aq)+ 2 I-(aq)→ MgI2(s) 
C) 2 H+(aq)+ SO32-(aq)+ Mg2+(aq)+ 2 I-(aq)→ H2SO3(s)+ MgI2(aq) 
D) 2 H+(aq)+ SO32-(aq)→ H2O(l)+ SO2(g) 
E) No reaction occurs.

Question 14

How many milliliters of a 9.0 M H2SO4 solution are needed to make 0.35 L of a 3.5 M solution?

Accepted Answer

A) 0.14 mL 
B) 0.90 mL 
C) 140 mL 
D) 900 mL 
A) 0.14 mL 
B) 0.90 mL 
C) 140 mL 
D) 900 mL

Question 15

Which of the following compounds is not an Arrhenius acid?

Accepted Answer

A) CH3CO2H 
B) CH3CH2NH2 
C) HNO2 
D) H2SO4 
A) CH3CO2H 
B) CH3CH2NH2 
C) HNO2 
D) H2SO4

Question 16

Which of the following is a gas-evolution reaction?

Accepted Answer

A) 2 C2H6(l)+ 7 O2(g)→ 4 CO2(g)+ 6 H2O(g) 
B) 2 H2(g)+ O2(g)→ 2 H2O(g) 
C) LiCl(aq)+ NaNO3(aq)→ LiNO3(aq)+ NaCl(g) 
D) NH4Cl(aq)+ KOH(aq)→ KCl(aq)+ NH3(g)+ H2O(l) 
E) None of the above are gas-evolution reactions. 
A) 2 C2H6(l)+ 7 O2(g)→ 4 CO2(g)+ 6 H2O(g) 
B) 2 H2(g)+ O2(g)→ 2 H2O(g) 
C) LiCl(aq)+ NaNO3(aq)→ LiNO3(aq)+ NaCl(g) 
D) NH4Cl(aq)+ KOH(aq)→ KCl(aq)+ NH3(g)+ H2O(l) 
E) None of the above are gas-evolution reactions.

Question 17

If 294 grams of FeS2 is allowed to react with 176 grams of O2 according to the following unbalanced equation,how many grams of Fe2O3 are produced?
FeS2 + O2 → Fe2O3 + SO2

Accepted Answer

Question 18

Which of the following compounds is an Arrhenius base?

Accepted Answer

A) CH3OH 
B) CH3CO2H 
C) HOCl 
D) CsOH 
A) CH3OH 
B) CH3CO2H 
C) HOCl 
D) CsOH

Question 19

What element is undergoing reduction (if any)in the following reaction?
Zn(s)+ 2 AgNO3(aq)→ Zn(NO3)2(aq)+ 2 Ag(s)

Accepted Answer

A) Zn 
B) N 
C) O 
D) Ag 
E) This is not an oxidation-reduction reaction. 
A) Zn 
B) N 
C) O 
D) Ag 
E) This is not an oxidation-reduction reaction.

Question 20

Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride:
Ag+(aq)+ Cl-(aq)→ AgCl(s)
Silver chloride is virtually insoluble in water so that the reaction appears to go to completion.How many grams of solid NaCl must be added to 25.0 mL of 0.366 M AgNO3 solution to completely precipitate the silver?

Accepted Answer

A) 9.15 × 10-3 g 
B) 1.57 × 10-4 g 
C) 0.535 g 
D) 0.157 g 
E) 6.39 × 103 g 
A) 9.15 × 10-3 g 
B) 1.57 × 10-4 g 
C) 0.535 g 
D) 0.157 g 
E) 6.39 × 103 g

What element is undergoing oxidation (if any)in the following reaction? CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(g)

A solution is prepared by adding 1.60 g of solid NaCl to 50.0 mL of 0.100 M CaCl₂.What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL.

Which of the following compounds is soluble in water?

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ N₂(g)→ 2Li₃N(s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in the presence of excess nitrogen?

Which of the following is a precipitation reaction?

What are the coefficients in front of NO₃^-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution: NO₃^-(aq)+ Cu(s)→ NO(g)+ Cu²⁺(aq)?

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 15.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l)+ 3 O₂(g)→ 2 CO₂(g)+ 3 H₂O(l)

How many moles of CO²⁺ are present in 0.150 L of a 0.200 M solution of CoI₂?

Give the oxidation state for S in SO₃^-2.

Which of the following pairs of aqueous solutions will react to produce a precipitate?

Determine the theoretical yield of HCl if 60.0 g of BCl₃and 37.5 g of H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl₃ = 117.16 g/mol. BCl₃(g)+ 3 H₂O(l)→ H₃BO₃(s)+ 3 HCl(g)

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of MgSO₃ and HI are mixed.

How many milliliters of a 9.0 M H₂SO₄ solution are needed to make 0.35 L of a 3.5 M solution?

Which of the following compounds is not an Arrhenius acid?

Which of the following is a gas-evolution reaction?

If 294 grams of FeS₂ is allowed to react with 176 grams of O₂ according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

Which of the following compounds is an Arrhenius base?

What element is undergoing reduction (if any)in the following reaction? Zn(s)+ 2 AgNO₃(aq)→ Zn(NO₃)₂(aq)+ 2 Ag(s)

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

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Filters

Exam 4: Chemical Quantities and Aqueous Reactions

What element is undergoing oxidation (if any)in the following reaction? CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(g)

A solution is prepared by adding 1.60 g of solid NaCl to 50.0 mL of 0.100 M CaCl2.What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL.

Which of the following compounds is soluble in water?

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ N2(g)→ 2Li3N(s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in the presence of excess nitrogen?

Which of the following is a precipitation reaction?

What are the coefficients in front of NO3-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution: ____ NO3-(aq)+ ____ Cu(s)→ ____ NO(g)+ ____ Cu2+(aq)?

If the density of ethanol,C2H5OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation? C2H5OH(l)+ 3 O2(g)→ 2 CO2(g)+ 3 H2O(l)

How many moles of CO2+ are present in 0.150 L of a 0.200 M solution of CoI2?

Give the oxidation state for S in SO3-2.

Which of the following pairs of aqueous solutions will react to produce a precipitate?

Determine the theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl3 = 117.16 g/mol. BCl3(g)+ 3 H2O(l)→ H3BO3(s)+ 3 HCl(g)

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of MgSO3 and HI are mixed.

How many milliliters of a 9.0 M H2SO4 solution are needed to make 0.35 L of a 3.5 M solution?

Which of the following compounds is not an Arrhenius acid?

Which of the following is a gas-evolution reaction?

If 294 grams of FeS2 is allowed to react with 176 grams of O2 according to the following unbalanced equation,how many grams of Fe2O3 are produced? FeS2 + O2 → Fe2O3 + SO2

Which of the following compounds is an Arrhenius base?

What element is undergoing reduction (if any)in the following reaction? Zn(s)+ 2 AgNO3(aq)→ Zn(NO3)2(aq)+ 2 Ag(s)

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

What element is undergoing oxidation (if any)in the following reaction? CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(g)

A solution is prepared by adding 1.60 g of solid NaCl to 50.0 mL of 0.100 M CaCl₂.What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 mL.

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+ N₂(g)→ 2Li₃N(s) How many moles of lithium nitride are produced when 0.450 mol of lithium react in the presence of excess nitrogen?

What are the coefficients in front of NO₃^-(aq)and Cu(s)when the following redox equation is balanced in an acidic solution: NO₃^-(aq)+ Cu(s)→ NO(g)+ Cu²⁺(aq)?

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 15.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l)+ 3 O₂(g)→ 2 CO₂(g)+ 3 H₂O(l)

How many moles of CO²⁺ are present in 0.150 L of a 0.200 M solution of CoI₂?

Give the oxidation state for S in SO₃^-2.

Determine the theoretical yield of HCl if 60.0 g of BCl₃and 37.5 g of H₂O are reacted according to the following balanced reaction.A possibly useful molar mass is BCl₃ = 117.16 g/mol. BCl₃(g)+ 3 H₂O(l)→ H₃BO₃(s)+ 3 HCl(g)

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of MgSO₃ and HI are mixed.

How many milliliters of a 9.0 M H₂SO₄ solution are needed to make 0.35 L of a 3.5 M solution?

If 294 grams of FeS₂ is allowed to react with 176 grams of O₂ according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

What element is undergoing reduction (if any)in the following reaction? Zn(s)+ 2 AgNO₃(aq)→ Zn(NO₃)₂(aq)+ 2 Ag(s)