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?

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) 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)

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?

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

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?

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

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

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

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?

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) 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)

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

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

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

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

Exam 4: Chemical Reactions

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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?

(Multiple Choice)

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Question 61

Which of the following anions always forms soluble compounds?

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Question 62

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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Question 63

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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Question 64

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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Question 65

Which of the following compounds has the largest formula weight?

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Question 66

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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Question 67

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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Question 68

Which of the following is a form of energy?

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Question 69

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

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Question 70

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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Question 71

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

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Question 72

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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Question 73

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?

(Multiple Choice)

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Question 74

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

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Question 75

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?

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Question 76

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

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Question 77

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

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Question 78

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

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Question 79

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

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Question 80

Showing 61 - 80 of 138

Exam 4: Chemical Reactions

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?

Which of the following anions always forms soluble compounds?

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?

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?

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?

Which of the following compounds has the largest formula weight?

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

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?

Which of the following is a form of energy?

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

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

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

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?

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?

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

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?

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

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

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

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?

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?

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

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?

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

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?

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?

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

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?

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

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