Question 1

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? K2O + H2O → KOH

Accepted Answer

A)  2 
B)  6 
C)  3 
D)  8 
E)  4 
A)  2 
B)  6 
C)  3 
D)  8 
E)  4

Question 2

How many grams of N2 are required to react with 2.30 moles of Mg in the following process? 3 Mg + N2 → Mg3N2? (Mg = 24.3 g/mol, N = 14.0 g/mol)

Accepted Answer

A)  21.5 g 
B)  0.767 g 
C)  64.4 g 
D)  0.027 g 
E)  193.2 g 
A)  21.5 g 
B)  0.767 g 
C)  64.4 g 
D)  0.027 g 
E)  193.2 g

Question 3

Write the complete balanced equation for the complete combustion reaction expected to occur between C3H7OH and O2.

Accepted Answer

A)  C3H7OH + O2 → 3 CO2 + 4 H2O 
B)  2 C3H7OH + 9 CO2 → 6 CO2 + 8 H2O + 9 C 
C)  2 C3H7OH + 6 CO2 → CO + 8 H2O 
D)  2 C3H7OH + 9 O2 → 6 CO2 + 8 H2O 
E)  2 C3H7OH + 9 O2 → 6 C + 8 H2 + 10 O2 
A)  C3H7OH + O2 → 3 CO2 + 4 H2O 
B)  2 C3H7OH + 9 CO2 → 6 CO2 + 8 H2O + 9 C 
C)  2 C3H7OH + 6 CO2 → CO + 8 H2O 
D)  2 C3H7OH + 9 O2 → 6 CO2 + 8 H2O 
E)  2 C3H7OH + 9 O2 → 6 C + 8 H2 + 10 O2

Question 4

How many grams of sulfuric acid, H2SO4, can be obtained from 400 grams of iron ore if the ore is 80.0% by mass FeS? The reactions involved are given below. 4 FeS + 7O2 → 2 Fe2O3 + 4 SO2
2 SO2 + O2 → 2 SO3
SO3 + H2O → H2SO4

Accepted Answer

A)  557 g 
B)  446 g 
C)  357 g 
D)  287 g 
E)  89.3 g 
A)  557 g 
B)  446 g 
C)  357 g 
D)  287 g 
E)  89.3 g

Question 5

How many grams of a solid mixture containing strontium chloride would one need to make 558 mL of a 0.100 M strontium chloride solution, if the solid mixture contains 58.6% strontium chloride by weight?

Accepted Answer

A)  6.62 g 
B)  15.1 g 
C)  8.85 g 
D)  5.19 g 
E)  9.52 g 
A)  6.62 g 
B)  15.1 g 
C)  8.85 g 
D)  5.19 g 
E)  9.52 g

Question 6

In a solution of alcohol and water that is 70% water, alcohol is the solvent.

Accepted Answer

A) True 
 B)False

Question 7

When the equation K2S2O3 + I2 → K2S4O6 + KI is balanced with the smallest integer coefficients, the coefficient of KI is:

Accepted Answer

A)  2 
B)  1 
C)  3 
D)  4 
E)  5 
A)  2 
B)  1 
C)  3 
D)  4 
E)  5

Question 8

When the equation Fe2(C2O4)3 → FeC2O4 + CO2 is balanced with the smallest integer coefficients, the coefficient of CO2 is:

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  3 
E)  5 
A)  1 
B)  2 
C)  4 
D)  3 
E)  5

Question 9

A formula is a shorthand way of representing a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 10

The Haber Process for the production of ammonia is represented by: 3 H2(g) + N2(g) → 2 NH3(g)
If a mixture of 30 g of hydrogen with 10 g of nitrogen produced 8.4 g of ammonia, what was the percent yield?

Accepted Answer

A)  84% 
B)  69% 
C)  49% 
D)  28% 
E)  20% 
A)  84% 
B)  69% 
C)  49% 
D)  28% 
E)  20%

Question 11

The chemical reaction during low current discharge of a simple "dry cell" involves: (unbalanced) Zn + MnO2 + NH4Cl → ZnCl2 + Mn2O3 + NH3 + H2O
What is the coefficient for zinc in the balanced equation that uses the lowest whole number ratios, and what is the limiting reagent for a process in which equal masses of reactants are mixed?

Accepted Answer

A)  1/Zn 
B)  2/Zn 
C)  1/MnO2 
D)  2/MnO2 
E)  2/NH4Cl 
A)  1/Zn 
B)  2/Zn 
C)  1/MnO2 
D)  2/MnO2 
E)  2/NH4Cl

Question 12

For the reaction symbolized as HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) water is both:

Accepted Answer

A)  a reactant and the solute 
B)  a reactant and the solvent 
C)  a product and the solute 
D)  a product and the solvent 
E)  a liquid and the intermediate 
A)  a reactant and the solute 
B)  a reactant and the solvent 
C)  a product and the solute 
D)  a product and the solvent 
E)  a liquid and the intermediate

Question 13

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation: Pb(s) + PbO2(s) + 2 H2SO4(aq) → 2 PbSO4(s) + 2 H2O(l) What mass of lead sulfate would result from the complete reaction of 41.4 g of lead?

Accepted Answer

A)  57.6 g 
B)  60.5 g 
C)  105 g 
D)  115 g 
E)  121 g 
A)  57.6 g 
B)  60.5 g 
C)  105 g 
D)  115 g 
E)  121 g

Question 14

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Na + HCl → NaCl + H2

Accepted Answer

A)  7 
B)  4 
C)  2 
D)  10 
E)  9 
A)  7 
B)  4 
C)  2 
D)  10 
E)  9

Question 15

How many grams of CrSO4 will be made from 25.0 grams each of Zn, K2Cr2O7, and H2SO4? 
4 Zn + K2Cr2O7 + 7 H2SO4 → 4 ZnSO4 + 2 CrSO4 + K2SO4 + 7 H2O

Accepted Answer

A)  10.8 g 
B)  28.3 g 
C)  25.2 g 
D)  12.6 g 
E)  37.8 g 
A)  10.8 g 
B)  28.3 g 
C)  25.2 g 
D)  12.6 g 
E)  37.8 g

Question 16

How many grams of iron(II) sulfide is required to make 225 g of sulfuric acid, H2SO4? The reactions involved are given below. 4 FeS + 17O2 → 2 Fe2O3 + 4 SO2
2 SO2 + O2 → 2 SO3
SO3 + H2O → H2SO4

Accepted Answer

A)  101 g 
B)  251 g 
C)  126 g 
D)  202 g 
E)  502 g 
A)  101 g 
B)  251 g 
C)  126 g 
D)  202 g 
E)  502 g

Question 17

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation: Pb(s) + PbO2(s) +2 H2SO4(aq) → 2 PbSO4(s) + 2 H2O(l)
Which is the limiting reagent and the amount of PbSO4 produced if 53.0 g of Pb, 77.3 g of PbO2, and 534 mL of 0.544 M solution of H2SO4 is used?

Accepted Answer

A)  PbO2, 196 g 
B)  Pb, 77.6 g 
C)  Pb, 155 g 
D)  H2SO4, 88.1 g 
E)  H2SO4, 176 g 
A)  PbO2, 196 g 
B)  Pb, 77.6 g 
C)  Pb, 155 g 
D)  H2SO4, 88.1 g 
E)  H2SO4, 176 g

Question 18

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Al + Fe2O3 → Al2O3 + Fe

Accepted Answer

A)  4 
B)  6 
C)  12 
D)  9 
E)  8 
A)  4 
B)  6 
C)  12 
D)  9 
E)  8

Question 19

Given the following reactions: Fe + Br2 → FeBr2
3 FeBr2 + Br2 → Fe3Br8
If each reaction is 82.0% efficient, what mass of Fe3Br8 is produced from 1.00 g Fe?

Accepted Answer

A)  4.81 g 
B)  3.94 g 
C)  2.65 g 
D)  3.24 g 
E)  2.57 g 
A)  4.81 g 
B)  3.94 g 
C)  2.65 g 
D)  3.24 g 
E)  2.57 g

Question 20

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? KClO3(s) → KCl(s) + O2(g)

Accepted Answer

A)  11 
B)  10 
C)  5 
D)  7 
E)  6 
A)  11 
B)  10 
C)  5 
D)  7 
E)  6

Exam 4: Chemical Reactions

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? K2O + H2O → KOH

How many grams of N2 are required to react with 2.30 moles of Mg in the following process? 3 Mg + N2 → Mg3N2? (Mg = 24.3 g/mol, N = 14.0 g/mol)

Write the complete balanced equation for the complete combustion reaction expected to occur between C3H7OH and O2.

How many grams of sulfuric acid, H2SO4, can be obtained from 400 grams of iron ore if the ore is 80.0% by mass FeS? The reactions involved are given below. 4 FeS + 7O2 → 2 Fe2O3 + 4 SO2 2 SO2 + O2 → 2 SO3 SO3 + H2O → H2SO4

How many grams of a solid mixture containing strontium chloride would one need to make 558 mL of a 0.100 M strontium chloride solution, if the solid mixture contains 58.6% strontium chloride by weight?

In a solution of alcohol and water that is 70% water, alcohol is the solvent.

When the equation K2S2O3 + I2 → K2S4O6 + KI is balanced with the smallest integer coefficients, the coefficient of KI is:

When the equation Fe2(C2O4)3 → FeC2O4 + CO2 is balanced with the smallest integer coefficients, the coefficient of CO2 is:

A formula is a shorthand way of representing a chemical reaction.

The Haber Process for the production of ammonia is represented by: 3 H2(g) + N2(g) → 2 NH3(g) If a mixture of 30 g of hydrogen with 10 g of nitrogen produced 8.4 g of ammonia, what was the percent yield?

For the reaction symbolized as HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) water is both:

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation: Pb(s) + PbO2(s) + 2 H2SO4(aq) → 2 PbSO4(s) + 2 H2O(l) What mass of lead sulfate would result from the complete reaction of 41.4 g of lead?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Na + HCl → NaCl + H2

How many grams of CrSO4 will be made from 25.0 grams each of Zn, K2Cr2O7, and H2SO4? 4 Zn + K2Cr2O7 + 7 H2SO4 → 4 ZnSO4 + 2 CrSO4 + K2SO4 + 7 H2O

How many grams of iron(II) sulfide is required to make 225 g of sulfuric acid, H2SO4? The reactions involved are given below. 4 FeS + 17O2 → 2 Fe2O3 + 4 SO2 2 SO2 + O2 → 2 SO3 SO3 + H2O → H2SO4

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Al + Fe2O3 → Al2O3 + Fe

Given the following reactions: Fe + Br2 → FeBr2 3 FeBr2 + Br2 → Fe3Br8 If each reaction is 82.0% efficient, what mass of Fe3Br8 is produced from 1.00 g Fe?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? KClO3(s) → KCl(s) + O2(g)

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? K₂O + H₂O → KOH

How many grams of N₂ are required to react with 2.30 moles of Mg in the following process? 3 Mg + N₂ → Mg₃N₂? (Mg = 24.3 g/mol, N = 14.0 g/mol)

Write the complete balanced equation for the complete combustion reaction expected to occur between C₃H₇OH and O₂.

How many grams of sulfuric acid, H₂SO₄, can be obtained from 400 grams of iron ore if the ore is 80.0% by mass FeS? The reactions involved are given below. 4 FeS + 7O₂ → 2 Fe₂O₃ + 4 SO₂ 2 SO₂ + O₂ → 2 SO₃ SO₃ + H₂O → H₂SO₄

When the equation K₂S₂O₃ + I₂ → K₂S₄O₆ + KI is balanced with the smallest integer coefficients, the coefficient of KI is:

When the equation Fe₂(C₂O₄)₃ → FeC₂O₄+ CO₂ is balanced with the smallest integer coefficients, the coefficient of CO₂ is:

The Haber Process for the production of ammonia is represented by: 3 H₂(g) + N₂(g) → 2 NH₃(g) If a mixture of 30 g of hydrogen with 10 g of nitrogen produced 8.4 g of ammonia, what was the percent yield?

For the reaction symbolized as HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l) water is both:

The chemical reaction occurring during the discharge of a lead storage battery can be represented by the equation: Pb(s) + PbO₂(s) + 2 H₂SO₄(aq) → 2 PbSO₄(s) + 2 H₂O(l) What mass of lead sulfate would result from the complete reaction of 41.4 g of lead?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Na + HCl → NaCl + H₂

How many grams of CrSO₄ will be made from 25.0 grams each of Zn, K₂Cr₂O₇, and H₂SO₄? 4 Zn + K₂Cr₂O₇ + 7 H₂SO₄ → 4 ZnSO₄ + 2 CrSO₄ + K₂SO₄ + 7 H₂O

How many grams of iron(II) sulfide is required to make 225 g of sulfuric acid, H₂SO₄? The reactions involved are given below. 4 FeS + 17O₂ → 2 Fe₂O₃ + 4 SO₂ 2 SO₂+ O₂ → 2 SO₃ SO₃ + H₂O → H₂SO₄

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Al + Fe₂O₃ → Al₂O₃ + Fe

Given the following reactions: Fe + Br₂ → FeBr₂ 3 FeBr₂ + Br₂ → Fe₃Br₈ If each reaction is 82.0% efficient, what mass of Fe₃Br₈ is produced from 1.00 g Fe?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? KClO₃(s) → KCl(s) + O₂(g)