Question 1

Which of the following are the products of the incomplete combustion of a hydrocarbon such as methane, CH4, or propane, C3H8?

Accepted Answer

A)   CO(g)  + H2O(g) 
B)   CO(g)  + H2O2(l) 
C)   CO2(g)  + H2O(g) 
D)   CO2(g)  + H2O(l)

Question 2

Which of the following is a form of energy?

Accepted Answer

A)   heat
B)   temperature
C)   volume
D)   mass

Question 3

Which of the following is the correct set of integer coefficients for the balanced equation? ___C6H14(g)  + ___O2(g)  → ___CO2(g)  + ___H2O(g)

Accepted Answer

A)   1, 1, 1, 1
B)   1, 3, 6, 7
C)   1, 9.5, 6, 7
D)   2, 19, 12, 14

Question 4

Which species is the oxidizing agent in the reaction CH2O(g)  + O2(g)  → HCOOH(g)  + H2O(g) ?

Accepted Answer

A)   CH2O(g) 
B)   O2(g) 
C)   HCOOH(g) 
D)   H2O(g)

Question 5

The balanced equation for burning octane is 2C8H18(g)  + 25O2(g)  → 18H2O(g)  + 16CO2(g) . What weight of oxygen is required to completely burn 19.8 g of octane?

Accepted Answer

A)   28.1 g
B)   34.7 g
C)   69.5 g
D)   139 g

Question 6

Which species is the reducing agent in the reaction CH2O(g)  + O2(g)  → 2HCOOH(g) ?

Accepted Answer

A)   CH2O(g) 
B)   O2(g) 
C)   HCOOH(g) 
D)   H2O(g)

Question 7

How many oxygen atoms are present in 5.20 mol of Al2(SO4) 3?

Accepted Answer

A)   62.4
B)   3.76 × 1025
C)   9.39 × 1024
D)   3.13 × 1024

Question 8

Which of the following is true regarding mass relationships in a chemical reaction?

Accepted Answer

A)   To determine mass relationships in a chemical reaction, you first need to know the balanced chemical equation for the reaction.
B)   To convert from grams to moles and vice versa, you need to use Avogadro's number as a conversion factor.
C)   To determine mass relationships in a chemical reaction, you first need to know the balanced chemical equation for the reaction, and to convert from grams to moles and vice versa, you need to use Avogadro's number as a conversion factor.
D)   None of these are true.

Question 9

The molecular weight of ethylene glycol is 62.0 amu. What is the mass of one molecule of ethylene glycol?

Accepted Answer

A)   9.70 × 1021 g
B)   62.0 g
C)   0.0161 g
D)   1.03 × 10-22 g

Question 10

The temperature of an unknown substance weighing 2,500 grams rises by 100°C when 30,000 cal of heat is added to it. What is the specific heat of this substance?

Accepted Answer

A)   0.12 cal/g·°C
B)   0.37 cal/g·°C
C)   0.62 cal/g·°C
D)   0.87 cal/g·°C

Question 11

A black precipitate of copper sulfide, CuS, is formed when a solution of Cu(II)  chloride, CuCl2, is added to a solution of potassium sulfide, K2S. Which of the following is the net ionic equation for this reaction?

Accepted Answer

A)   CuCl2(aq)  + K2S(aq)  → CuS(s)  + 2KCl(aq) 
B)   Cu2+(aq)  + Cl22-(aq)  + K22+(aq)  + S2-(aq)  → CuS(s)  + K22+(aq)  + Cl22-(aq) 
C)   Cu2+(aq)  + 2Cl-(aq)  + 2K+(aq)  + S2-(aq)  → CuS(s)  + 2K+(aq)  + 2Cl- (aq) 
D)   Cu2+(aq)  + S2-(aq)  → CuS(s)

Question 12

In a blast furnace, coke, which is solid carbon, reacts with O2(g)  to form carbon monoxide. The carbon monoxide then reacts with Fe2O3(s)  to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?

Accepted Answer

A)   2Fe2O3(s)  + 3C(s)  + 3O2(g)  → 2Fe(s)  + 3CO2(g) 
B)   2Fe2O3(s)  + 2C(s)  + 3O2(g)  → 4Fe(s)  + 2CO2(g) 
C)   2Fe2O3(s)  + 6C(s)  + 3O2(g)  → 4Fe(s)  + 6CO2(g) 
D)   2Fe2O3(s)  + C(s)  + 3O2(g)  → Fe(s)  + CO2(g)

Question 13

Which of the following is true of carbonate salts and phosphate salts?

Accepted Answer

A)   Most carbonate salts are soluble, but most phosphate salts are insoluble.
B)   Most phosphate salts are soluble, but most carbonate salts are insoluble.
C)   Most carbonate salts and most phosphate salts are soluble.
D)   Most carbonate salts and most phosphate salts are insoluble.

Question 14

The balanced equation for burning octane is 2C8H18(g)  + 25O2(g)  → 18H2O(g)  + 16CO2(g) . What weight of H2O is produced by completely burning 19.8 g of octane?

Accepted Answer

A)   28.1 g
B)   34.7 g
C)   69.5 g
D)   139 g

Question 15

Which of the following compounds has the largest formula weight?

Accepted Answer

A)   KCl
B)   NaCl
C)   MgF2
D)   BF3

Question 16

In an experiment, ammonia is produced by mixing 3 moles of nitrogen gas with 6 moles of hydrogen gas. The balanced equation for this reaction is as follows: N2(g)  + 3H2(g)  → 2NH3(g) 
What is the number of moles of ammonia produced?

Accepted Answer

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

Question 17

Assume each of the containers in the image contains Avogadro's number of molecules of the substance pictured.  Which of the following correctly describes each container?

Accepted Answer

A)   Each contains the same mass.
B)   Each contains the same volume.
C)   Each contains the same number of moles.
D)   Each contains the same number of atoms
E)   Each contains the same number of moles and the same number of atoms.

Question 18

To which of the following is the term formula weight applicable?

Accepted Answer

A)   ionic compounds
B)   covalent compounds
C)   both ionic and covalent compounds
D)   neither ionic or covalent compounds

Question 19

Which of the following anions always forms soluble compounds?

Accepted Answer

A)   CH3COO-
B)   PO42-
C)   S2-
D)   all of these

Question 20

The reaction of nitric acid, HNO3(aq) , with calcium carbonate, CaCO3(s) , produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

Accepted Answer

A)   HNO3(aq)  + CaCO3(s)  → CaNO3(aq)  + CO2(g)  + H2O(l) 
B)   2HNO3(aq)  + CaCO3(s)  → CaNO3(aq)  + CO2(g)  + H2O(l) 
C)   HNO3(aq)  + CaCO3(s)  → Ca(NO3) 2(aq)  + CO2(g)  + H2O(l) 
D)   2HNO3(aq)  + CaCO3(s)  → Ca(NO3) 2(aq)  + CO2(g)  + H2O(l)

Exam 4: Chemical Reactions

Which species is the oxidizing agent in the reaction CH2O(g) + O2(g) → HCOOH(g) + H2O(g) ?

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To which of the following is the term formula weight applicable?

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Which of the following compounds has the largest formula weight?

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In a blast furnace, coke, which is solid carbon, reacts with O2(g) to form carbon monoxide. The carbon monoxide then reacts with Fe2O3(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?

Correct AnswerverifiedShow Answer

In an experiment, ammonia is produced by mixing 3 moles of nitrogen gas with 6 moles of hydrogen gas. The balanced equation for this reaction is as follows: N2(g) + 3H2(g) → 2NH3(g) What is the number of moles of ammonia produced?

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Which species is the reducing agent in the reaction CH2O(g) + O2(g) → 2HCOOH(g) ?

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Which of the following is true regarding mass relationships in a chemical reaction?

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How many oxygen atoms are present in 5.20 mol of Al2(SO4) 3?

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The balanced equation for burning octane is 2C8H18(g) + 25O2(g) → 18H2O(g) + 16CO2(g) . What weight of oxygen is required to completely burn 19.8 g of octane?

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Which of the following is true of carbonate salts and phosphate salts?

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The temperature of an unknown substance weighing 2,500 grams rises by 100°C when 30,000 cal of heat is added to it. What is the specific heat of this substance?

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Which of the following are the products of the incomplete combustion of a hydrocarbon such as methane, CH4, or propane, C3H8?

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Which of the following is a form of energy?

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The molecular weight of ethylene glycol is 62.0 amu. What is the mass of one molecule of ethylene glycol?

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A black precipitate of copper sulfide, CuS, is formed when a solution of Cu(II) chloride, CuCl2, is added to a solution of potassium sulfide, K2S. Which of the following is the net ionic equation for this reaction?

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The balanced equation for burning octane is 2C8H18(g) + 25O2(g) → 18H2O(g) + 16CO2(g) . What weight of H2O is produced by completely burning 19.8 g of octane?

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Which of the following anions always forms soluble compounds?

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The reaction of nitric acid, HNO3(aq) , with calcium carbonate, CaCO3(s) , produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

Correct AnswerverifiedShow Answer

Assume each of the containers in the image contains Avogadro's number of molecules of the substance pictured. Which of the following correctly describes each container?

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Which of the following is the correct set of integer coefficients for the balanced equation? ___C6H14(g) + ___O2(g) → ___CO2(g) + ___H2O(g)

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Which species is the oxidizing agent in the reaction CH₂O(g) + O₂(g) → HCOOH(g) + H₂O(g) ?

Correct Answer
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In a blast furnace, coke, which is solid carbon, reacts with O₂(g) to form carbon monoxide. The carbon monoxide then reacts with Fe₂O₃(s) to produce solid iron and carbon dioxide. Which of the following is the balanced equation for this combined process?

Correct Answer
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In an experiment, ammonia is produced by mixing 3 moles of nitrogen gas with 6 moles of hydrogen gas. The balanced equation for this reaction is as follows: N₂(g) + 3H₂(g) → 2NH₃(g) What is the number of moles of ammonia produced?

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Which species is the reducing agent in the reaction CH₂O(g) + O₂(g) → 2HCOOH(g) ?

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Correct Answer
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How many oxygen atoms are present in 5.20 mol of Al₂(SO₄) ₃?

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The balanced equation for burning octane is 2C₈H₁₈(g) + 25O₂(g) → 18H₂O(g) + 16CO₂(g) . What weight of oxygen is required to completely burn 19.8 g of octane?

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Which of the following are the products of the incomplete combustion of a hydrocarbon such as methane, CH₄, or propane, C₃H₈?

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A black precipitate of copper sulfide, CuS, is formed when a solution of Cu(II) chloride, CuCl₂, is added to a solution of potassium sulfide, K₂S. Which of the following is the net ionic equation for this reaction?

Correct Answer
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The balanced equation for burning octane is 2C₈H₁₈(g) + 25O₂(g) → 18H₂O(g) + 16CO₂(g) . What weight of H₂O is produced by completely burning 19.8 g of octane?

Correct Answer
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Correct Answer
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The reaction of nitric acid, HNO₃(aq) , with calcium carbonate, CaCO₃(s) , produces calcium nitrate, carbon dioxide, and water. Which of the following is the correct balanced equation for this reaction?

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Correct Answer
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Which of the following is the correct set of integer coefficients for the balanced equation? _C₆H₁₄(g) + _O₂(g) → _CO₂(g) + _H₂O(g)

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