Question 1

Which of the following processes could theoretically produce the maximum mass of oxygen per gram of metal salt reactant?

Accepted Answer

A)  2 KClO3 → 2 KCl + 3 O2 
B)  4 KO2 + 2 CO2 → 2 K2CO3 + 3 O2 
C)  2 Na2O2 + 2 H2SO4 → 2 H2O + O2 
D)  2 HgO → 2 Hg + O2 
E)  NaBrO2 → NaBr + O2 
A)  2 KClO3 → 2 KCl + 3 O2 
B)  4 KO2 + 2 CO2 → 2 K2CO3 + 3 O2 
C)  2 Na2O2 + 2 H2SO4 → 2 H2O + O2 
D)  2 HgO → 2 Hg + O2 
E)  NaBrO2 → NaBr + O2 A

Question 2

How many moles of H3PO4 are produced when 20.0 g of HCl are produced by the reaction PCl5 + 4 H2O → H3PO4 + 5 HCl?

Accepted Answer

A)  (20.0/36.5) g 
B)  (20.0/35.5)/5 g 
C)  (20.0/36.5)/5 g 
D)  (20.0/98.0) g 
E)  (20.0/98.0)/5 g 
A)  (20.0/36.5) g 
B)  (20.0/35.5)/5 g 
C)  (20.0/36.5)/5 g 
D)  (20.0/98.0) g 
E)  (20.0/98.0)/5 g C

Question 3

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 39.8 g of Pb, 57.9 g of PbO2, and 352 mL of 0.375 M solution of H2SO4 is used?

Accepted Answer

A)  PbO2, 146 g 
B)  Pb, 58.2 g 
C)  Pb, 116 g 
D)  H2SO4, 80.0 g 
E)  H2SO4, 40.0 g 
A)  PbO2, 146 g 
B)  Pb, 58.2 g 
C)  Pb, 116 g 
D)  H2SO4, 80.0 g 
E)  H2SO4, 40.0 g E

Question 4

Sulfuric acid can be prepared by a multistep process summarized as: 2 SO2 + O2 + 2 H2O → 2 H2SO4
What mass of sulfuric acid could be produced daily by a process using 38 kg per day of sulfur dioxide with a 70% conversion efficiency ("yield"), assuming that sulfur dioxide is the limiting reagent?

Accepted Answer

A)  27 kg/day 
B)  41 kg/day 
C)  54 kg/day 
D)  58 kg/day 
E)  83 kg/day 
A)  27 kg/day 
B)  41 kg/day 
C)  54 kg/day 
D)  58 kg/day 
E)  83 kg/day

Question 5

The molarity of a solution that contains 14.7 g of H2SO4 in 200.0 mL solution is ________.

Accepted Answer

A)  1.5 M 
B)  0.75 M 
C)  0.77 M 
D)  7.4 M 
E)  3.0 M 
A)  1.5 M 
B)  0.75 M 
C)  0.77 M 
D)  7.4 M 
E)  3.0 M

Question 6

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? CaC2(s) + H2O(l) → Ca(OH)2(s) + C2H2(g)

Accepted Answer

A)  8 
B)  4 
C)  5 
D)  10 
E)  9 
A)  8 
B)  4 
C)  5 
D)  10 
E)  9

Question 7

If 5.97 mL of a solution of NaCl contains 2.54 mg of sodium ion, what is the molarity of the sodium chloride solution?

Accepted Answer

A)  0.425 M 
B)  1.85 × 10-2 M 
C)  1.85 × 10-5 M 
D)  7.28 × 10-3 M 
E)  0.102 M 
A)  0.425 M 
B)  1.85 × 10-2 M 
C)  1.85 × 10-5 M 
D)  7.28 × 10-3 M 
E)  0.102 M

Question 8

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? PCl3(l) + Cl2(g) + P4O10(s) → POCl3(l)

Accepted Answer

A)  3 
B)  18 
C)  45 
D)  10 
E)  23 
A)  3 
B)  18 
C)  45 
D)  10 
E)  23

Question 9

In a chemical equation, Δ above the yield sign means the reaction will produce heat.

Accepted Answer

A) True 
 B)False

Question 10

Consider the equation: 2 Na + 2 H2O → 2 NaOH + H2.
If 92.0 g of sodium is reacted with 76.0 g of water until the reaction goes to completion, which reactant will remain and in what quantity?

Accepted Answer

A)  72.0 g water 
B)  43.5 g sodium 
C)  3.9 g water 
D)  10.0 g sodium 
E)  10.0 g water 
A)  72.0 g water 
B)  43.5 g sodium 
C)  3.9 g water 
D)  10.0 g sodium 
E)  10.0 g water

Question 11

If 8.52 g each of zinc, potassium dichromate, and sulfuric acid are reacted by the reaction: 4 Zn + K2Cr2O7 + 7 H2SO4→ 4 ZnSO4 + 2 CrSO4 +K2SO4 + 7 H2O
How many grams of zinc will be left unreacted?

Accepted Answer

A)  0.94 g 
B)  3.65 g 
C)  5.27 g 
D)  1.89 g 
E)  3.25 g 
A)  0.94 g 
B)  3.65 g 
C)  5.27 g 
D)  1.89 g 
E)  3.25 g

Question 12

What mass of water is produced in the metathesis reaction 75.2 g Zn(OH)2 with 43.4 g HCl?

Accepted Answer

A)  13.6 g 
B)  27.3 g 
C)  10.7 g 
D)  21.4 g 
E)  31.8 g 
A)  13.6 g 
B)  27.3 g 
C)  10.7 g 
D)  21.4 g 
E)  31.8 g

Question 13

45.8 mL of a 3.14 M sodium chloride solution were used to react completely with 50.0 mL of an aqueous silver nitrate solution. What is the molarity of the silver nitrate solution?

Accepted Answer

A)  2.88 M 
B)  1.50 M 
C)  3.14 M 
D)  3.42 M 
E)  1.71 M 
A)  2.88 M 
B)  1.50 M 
C)  3.14 M 
D)  3.42 M 
E)  1.71 M

Question 14

In a balanced equation, the number of atoms of each element in the products must equal to the number of atoms of each element in the reactants.

Accepted Answer

A) True 
 B)False

Question 15

If 0.500 mol of CaCl2 is mixed with 0.200 mol Na3PO4, the maximum amount in moles of Ca3(PO4)2 that can be formed is:

Accepted Answer

A)  0.17 
B)  0.20 
C)  0.10 
D)  0.67 
E)  0.50 
A)  0.17 
B)  0.20 
C)  0.10 
D)  0.67 
E)  0.50

Question 16

Given the reaction: P4(l) + 6 Cl2(g) → 4 PCl3(l)
If the percent yield is 82%, what mass of P4 is required to obtain 2.30 g PCl3 (Cl2 in excess)?

Accepted Answer

A)  0.63 g 
B)  0.52 g 
C)  0.43 g 
D)  0.16 g 
E)  0.95 g 
A)  0.63 g 
B)  0.52 g 
C)  0.43 g 
D)  0.16 g 
E)  0.95 g

Question 17

In the reaction: 4 Zn + K2Cr2O7 + 7 H2SO4→ 4 ZnSO4 + 2 CrSO4 +K2SO4 + 7 H2O, if 25.4 g of zinc sulfate is to be made, how many grams of potassium dichromate is required?

Accepted Answer

A)  13.9 g 
B)  3.48 g 
C)  46.3 g 
D)  6.35 g 
E)  11.6 g 
A)  13.9 g 
B)  3.48 g 
C)  46.3 g 
D)  6.35 g 
E)  11.6 g

Question 18

To measure the volume of an irregularly shaped container filled with water, 1.00 mL of 2.00 M potassium chloride solution is added. After stirring, a 5.00 mL sample was found to contain 2.54 × 10-2 mg of potassium ion. What is the volume of the container?

Accepted Answer

A)  15.4 L 
B)  29.4 L 
C)  2.94 × 104 L 
D)  3.97 × 10-4 L 
E)  2.54 L 
A)  15.4 L 
B)  29.4 L 
C)  2.94 × 104 L 
D)  3.97 × 10-4 L 
E)  2.54 L

Question 19

Stoichiometric factor relates the amounts, in moles, of any two substances involved in chemical reaction.

Accepted Answer

A) True 
 B)False

Question 20

What thickness (in cm) is the silicon block (density = 2.33 g/cm3) that is 2.87 cm wide and long necessary to react with 91.3 g of Cr2O3 by the reaction: 3 Si (s) + 2 Cr2O3 (s) → 3 SiO2 (s) + 4 Cr (l)?

Accepted Answer

A)  2.05 cm 
B)  1.32 cm 
C)  3.08 cm 
D)  8.98 cm 
E)  3.79 cm 
A)  2.05 cm 
B)  1.32 cm 
C)  3.08 cm 
D)  8.98 cm 
E)  3.79 cm

Exam 4: Chemical Reactions

Which of the following processes could theoretically produce the maximum mass of oxygen per gram of metal salt reactant?

How many moles of H3PO4 are produced when 20.0 g of HCl are produced by the reaction PCl5 + 4 H2O → H3PO4 + 5 HCl?

Sulfuric acid can be prepared by a multistep process summarized as: 2 SO2 + O2 + 2 H2O → 2 H2SO4 What mass of sulfuric acid could be produced daily by a process using 38 kg per day of sulfur dioxide with a 70% conversion efficiency ("yield"), assuming that sulfur dioxide is the limiting reagent?

The molarity of a solution that contains 14.7 g of H2SO4 in 200.0 mL solution is ________.

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? CaC2(s) + H2O(l) → Ca(OH)2(s) + C2H2(g)

If 5.97 mL of a solution of NaCl contains 2.54 mg of sodium ion, what is the molarity of the sodium chloride solution?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? PCl3(l) + Cl2(g) + P4O10(s) → POCl3(l)

In a chemical equation, Δ above the yield sign means the reaction will produce heat.

Consider the equation: 2 Na + 2 H2O → 2 NaOH + H2. If 92.0 g of sodium is reacted with 76.0 g of water until the reaction goes to completion, which reactant will remain and in what quantity?

If 8.52 g each of zinc, potassium dichromate, and sulfuric acid are reacted by the reaction: 4 Zn + K2Cr2O7 + 7 H2SO4→ 4 ZnSO4 + 2 CrSO4 +K2SO4 + 7 H2O How many grams of zinc will be left unreacted?

What mass of water is produced in the metathesis reaction 75.2 g Zn(OH)2 with 43.4 g HCl?

45.8 mL of a 3.14 M sodium chloride solution were used to react completely with 50.0 mL of an aqueous silver nitrate solution. What is the molarity of the silver nitrate solution?

In a balanced equation, the number of atoms of each element in the products must equal to the number of atoms of each element in the reactants.

If 0.500 mol of CaCl2 is mixed with 0.200 mol Na3PO4, the maximum amount in moles of Ca3(PO4)2 that can be formed is:

Given the reaction: P4(l) + 6 Cl2(g) → 4 PCl3(l) If the percent yield is 82%, what mass of P4 is required to obtain 2.30 g PCl3 (Cl2 in excess)?

In the reaction: 4 Zn + K2Cr2O7 + 7 H2SO4→ 4 ZnSO4 + 2 CrSO4 +K2SO4 + 7 H2O, if 25.4 g of zinc sulfate is to be made, how many grams of potassium dichromate is required?

To measure the volume of an irregularly shaped container filled with water, 1.00 mL of 2.00 M potassium chloride solution is added. After stirring, a 5.00 mL sample was found to contain 2.54 × 10-2 mg of potassium ion. What is the volume of the container?

Stoichiometric factor relates the amounts, in moles, of any two substances involved in chemical reaction.

What thickness (in cm) is the silicon block (density = 2.33 g/cm3) that is 2.87 cm wide and long necessary to react with 91.3 g of Cr2O3 by the reaction: 3 Si (s) + 2 Cr2O3 (s) → 3 SiO2 (s) + 4 Cr (l)?

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

How many moles of H₃PO₄ are produced when 20.0 g of HCl are produced by the reaction PCl₅ + 4 H₂O → H₃PO₄ + 5 HCl?

The molarity of a solution that contains 14.7 g of H₂SO₄ in 200.0 mL solution is ________.

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? CaC₂(s) + H₂O(l) → Ca(OH)₂(s) + C₂H₂(g)

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? PCl₃(l) + Cl₂(g) + P₄O₁₀(s) → POCl₃(l)

Consider the equation: 2 Na + 2 H₂O → 2 NaOH + H₂. If 92.0 g of sodium is reacted with 76.0 g of water until the reaction goes to completion, which reactant will remain and in what quantity?

If 8.52 g each of zinc, potassium dichromate, and sulfuric acid are reacted by the reaction: 4 Zn + K₂Cr₂O₇ + 7 H₂SO₄→ 4 ZnSO₄ + 2 CrSO₄ +K₂SO₄ + 7 H₂O How many grams of zinc will be left unreacted?

What mass of water is produced in the metathesis reaction 75.2 g Zn(OH)₂ with 43.4 g HCl?

If 0.500 mol of CaCl₂is mixed with 0.200 mol Na₃PO₄, the maximum amount in moles of Ca₃(PO₄)₂ that can be formed is:

Given the reaction: P₄(l) + 6 Cl₂(g) → 4 PCl₃(l) If the percent yield is 82%, what mass of P⁴ is required to obtain 2.30 g PCl₃ (Cl₂ in excess)?

In the reaction: 4 Zn + K₂Cr₂O₇ + 7 H₂SO₄→ 4 ZnSO₄ + 2 CrSO₄+K₂SO₄ + 7 H₂O, if 25.4 g of zinc sulfate is to be made, how many grams of potassium dichromate is required?

To measure the volume of an irregularly shaped container filled with water, 1.00 mL of 2.00 M potassium chloride solution is added. After stirring, a 5.00 mL sample was found to contain 2.54 × 10^-2 mg of potassium ion. What is the volume of the container?

What thickness (in cm) is the silicon block (density = 2.33 g/cm3) that is 2.87 cm wide and long necessary to react with 91.3 g of Cr₂O₃ by the reaction: 3 Si (s) + 2 Cr₂O₃ (s) → 3 SiO₂ (s) + 4 Cr (l)?