Question 1

A chemical equation may sometimes be balanced with fractional coefficients.This is not appropriate when utilizing what interpretation of the reaction?

Accepted Answer

A) Macroscopic 
B) Molar 
C) Particulate 
D) Both macroscopic and molar 
E) Both molar and particulate 
A) Macroscopic 
B) Molar 
C) Particulate 
D) Both macroscopic and molar 
E) Both molar and particulate

Question 2

The combination of copper (II)nitrate and ammonium sulfide solutions yields a precipitate.Write the balanced chemical equation for this reaction.What is the coefficient for copper (II)nitrate?

Accepted Answer

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

Question 3

Lithium combines with oxygen to form lithium oxide.Write the balanced chemical equation for this reaction.What is the coefficient for lithium?

Accepted Answer

A) 4 
B) 3 
C) 2 
D) 1 
E) none of the above 
A) 4 
B) 3 
C) 2 
D) 1 
E) none of the above

Question 4

A pot of room temperature water is placed on a stovetop burner.After a couple of minutes,small,odorless,colorless bubbles form and bubble out of the liquid.After a few more minutes,similar,larger bubbles form and bubble out at a faster rate.Which of the following is the best explanation of the observations?

Accepted Answer

A) No change occurs because the bubbles contain no matter. 
B) The smaller bubbles are a result of a physical change, and the larger bubbles are the result of a chemical change. 
C) The smaller bubbles are the result of a chemical change, and the larger bubbles are the result of a physical change. 
D) Both the smaller and larger bubbles are the result of a physical change. 
E) Both the smaller and larger bubbles are the result of a chemical change. 
A) No change occurs because the bubbles contain no matter. 
B) The smaller bubbles are a result of a physical change, and the larger bubbles are the result of a chemical change. 
C) The smaller bubbles are the result of a chemical change, and the larger bubbles are the result of a physical change. 
D) Both the smaller and larger bubbles are the result of a physical change. 
E) Both the smaller and larger bubbles are the result of a chemical change.

Question 5

Consider the following particulate-level representation of a reaction.   How would this reaction be classified.

Accepted Answer

A) combination 
B) decomposition 
C) single-replacement 
D) double-replacement 
A) combination 
B) decomposition 
C) single-replacement 
D) double-replacement

Question 6

The following image shows the result of mixing an aqueous solution of silver nitrate with an aqueous solution of sodium chloride.   The products of the reaction are a solid and a solution.The physical states of the reaction in the equation should be specified using which set of state symbols,respectively?

Accepted Answer

A) (l), (l), (s), (l) 
B) (aq), (aq), (s), (aq) 
C) (aq), (aq), (s), (l) 
D) (l), (l), (s), (aq) 
E) (aq), (aq), (p), (aq) 
A) (l), (l), (s), (l) 
B) (aq), (aq), (s), (aq) 
C) (aq), (aq), (s), (l) 
D) (l), (l), (s), (aq) 
E) (aq), (aq), (p), (aq)

Question 7

When the equation ___ Ca(OH)2 + ___ H3PO4 → ___ Ca3(PO4)2 + ___ H2O is properly balanced,what is the sum of the coefficients?

Accepted Answer

A) 8 or less 
B) 9 
C) 10 
D) 11 
E) 12 or more 
A) 8 or less 
B) 9 
C) 10 
D) 11 
E) 12 or more

Question 8

What is the coefficient for carbon dioxide when the equation ___ C2H6 + ___ O2 → ___ CO2 + ___ H2O is properly balanced?

Accepted Answer

A) 7 
B) 6 
C) 5 
D) 4 
E) 2 
A) 7 
B) 6 
C) 5 
D) 4 
E) 2

Question 9

Consider the following particulate-level representation of a reaction   How is the reaction classified?

Accepted Answer

A) combination 
B) decomposition 
C) single-replacement 
D) double-replacement 
A) combination 
B) decomposition 
C) single-replacement 
D) double-replacement

Question 10

Consider the hypothetical chemical reaction represented by the equation 3 A + 2 B → A3B2 Which of the following is a correct interpretation of this equation?
i.3 grams of A react with 2 grams of B to form 1 gram of A3B2
ii.3 atoms of A react with 2 atoms of B to form 1 molecule of A3B2
iii.3 moles of A react with 2 moles of B to form 1 mole of A3B2

Accepted Answer

A) i only 
B) ii only 
C) iii only 
D) ii and iii 
E) i, ii, and iii 
A) i only 
B) ii only 
C) iii only 
D) ii and iii 
E) i, ii, and iii

Question 11

When the equation ___ PCl5 + ___ H2O → ___ H3PO4 + ___ HCl is properly balanced,what is the sum of the coefficients?

Accepted Answer

A) 8 or less 
B) 9 
C) 10 
D) 11 
E) 12 or more 
A) 8 or less 
B) 9 
C) 10 
D) 11 
E) 12 or more

Question 12

When sodium chloride and silver nitrate solutions are combined,the reaction shown below occurs.   Write the balanced chemical equation for this reaction.What is the coefficient for silver nitrate?

Accepted Answer

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

Question 13

Aluminum hydroxide is added to nitric acid.Write the balanced chemical equation for this reaction.What is the coefficient for aluminum hydroxide?

Accepted Answer

A) 6 
B) 4 
C) 3 
D) 2 
E) 1 
A) 6 
B) 4 
C) 3 
D) 2 
E) 1

Question 14

Pure hydrogen iodide decomposes spontaneously to its elements.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 5 
B) 3 
C) 7 
D) 4 
E) 6 
A) 5 
B) 3 
C) 7 
D) 4 
E) 6

Question 15

A piece of potassium is placed in a phosphoric acid solution.Write the balanced chemical equation for this reaction.What is the coefficient for potassium?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) none of the above 
A) 1 
B) 2 
C) 3 
D) 4 
E) none of the above

Question 16

Which of the following generally indicates the possibility of a chemical change?
i.Color change
ii.Formation of a solid
iii.Formation of a gas
iv.Absorption or release of heat energy
v.Emission of light energy

Accepted Answer

A) All 
B) All but i 
C) All but ii 
D) All but iii 
E) All but v 
A) All 
B) All but i 
C) All but ii 
D) All but iii 
E) All but v

Question 17

Nitric acid reacts with a solution of potassium hydroxide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 10 
B) 8 
C) 6 
D) 4 
E) none of the above 
A) 10 
B) 8 
C) 6 
D) 4 
E) none of the above

Question 18

Calcium nitrate and potassium fluoride solutions react to form a precipitate.How should this reaction be classified?

Accepted Answer

A) combination 
B) decomposition 
C) double-replacement 
D) single-replacement 
A) combination 
B) decomposition 
C) double-replacement 
D) single-replacement

Question 19

Barium peroxide,BaO2,breaks down into barium oxide and oxygen.Write the balanced chemical equation for this reaction.What is the coefficient for barium oxide?

Accepted Answer

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

Question 20

Lead (II)carbonate decomposes to lead (II)oxide and carbon dioxide.Write the balanced chemical equation for this reaction.What is the coefficient for lead (II)carbonate?

Accepted Answer

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

A chemical equation may sometimes be balanced with fractional coefficients.This is not appropriate when utilizing what interpretation of the reaction?

The combination of copper (II)nitrate and ammonium sulfide solutions yields a precipitate.Write the balanced chemical equation for this reaction.What is the coefficient for copper (II)nitrate?

Lithium combines with oxygen to form lithium oxide.Write the balanced chemical equation for this reaction.What is the coefficient for lithium?

Consider the following particulate-level representation of a reaction. How would this reaction be classified.

When the equation _ Ca(OH)₂ + _ H₃PO₄ → _ Ca₃(PO₄)₂ + _ H₂O is properly balanced,what is the sum of the coefficients?

What is the coefficient for carbon dioxide when the equation _ C₂H₆ + _ O₂ → _ CO₂ + _ H₂O is properly balanced?

Consider the following particulate-level representation of a reaction How is the reaction classified?

When the equation _ PCl₅ + _ H₂O → _ H₃PO₄ + _ HCl is properly balanced,what is the sum of the coefficients?

When sodium chloride and silver nitrate solutions are combined,the reaction shown below occurs. Write the balanced chemical equation for this reaction.What is the coefficient for silver nitrate?

Aluminum hydroxide is added to nitric acid.Write the balanced chemical equation for this reaction.What is the coefficient for aluminum hydroxide?

Pure hydrogen iodide decomposes spontaneously to its elements.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A piece of potassium is placed in a phosphoric acid solution.Write the balanced chemical equation for this reaction.What is the coefficient for potassium?

Which of the following generally indicates the possibility of a chemical change? i.Color change ii.Formation of a solid iii.Formation of a gas iv.Absorption or release of heat energy v.Emission of light energy

Nitric acid reacts with a solution of potassium hydroxide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Calcium nitrate and potassium fluoride solutions react to form a precipitate.How should this reaction be classified?

Barium peroxide,BaO₂,breaks down into barium oxide and oxygen.Write the balanced chemical equation for this reaction.What is the coefficient for barium oxide?

Lead (II)carbonate decomposes to lead (II)oxide and carbon dioxide.Write the balanced chemical equation for this reaction.What is the coefficient for lead (II)carbonate?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Atomic Theory: The Nuclear Model of the Atom

Chemical Nomenclature

Chemical Formula Relationships

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Exam 8: Chemical Reactions

A chemical equation may sometimes be balanced with fractional coefficients.This is not appropriate when utilizing what interpretation of the reaction?

The combination of copper (II)nitrate and ammonium sulfide solutions yields a precipitate.Write the balanced chemical equation for this reaction.What is the coefficient for copper (II)nitrate?

Lithium combines with oxygen to form lithium oxide.Write the balanced chemical equation for this reaction.What is the coefficient for lithium?

Consider the following particulate-level representation of a reaction. How would this reaction be classified.

When the equation ___ Ca(OH)2 + ___ H3PO4 → ___ Ca3(PO4)2 + ___ H2O is properly balanced,what is the sum of the coefficients?

What is the coefficient for carbon dioxide when the equation ___ C2H6 + ___ O2 → ___ CO2 + ___ H2O is properly balanced?

Consider the following particulate-level representation of a reaction How is the reaction classified?

When the equation ___ PCl5 + ___ H2O → ___ H3PO4 + ___ HCl is properly balanced,what is the sum of the coefficients?

When sodium chloride and silver nitrate solutions are combined,the reaction shown below occurs. Write the balanced chemical equation for this reaction.What is the coefficient for silver nitrate?

Aluminum hydroxide is added to nitric acid.Write the balanced chemical equation for this reaction.What is the coefficient for aluminum hydroxide?

Pure hydrogen iodide decomposes spontaneously to its elements.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A piece of potassium is placed in a phosphoric acid solution.Write the balanced chemical equation for this reaction.What is the coefficient for potassium?

Which of the following generally indicates the possibility of a chemical change? i.Color change ii.Formation of a solid iii.Formation of a gas iv.Absorption or release of heat energy v.Emission of light energy

Nitric acid reacts with a solution of potassium hydroxide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Calcium nitrate and potassium fluoride solutions react to form a precipitate.How should this reaction be classified?

Barium peroxide,BaO2,breaks down into barium oxide and oxygen.Write the balanced chemical equation for this reaction.What is the coefficient for barium oxide?

Lead (II)carbonate decomposes to lead (II)oxide and carbon dioxide.Write the balanced chemical equation for this reaction.What is the coefficient for lead (II)carbonate?

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Atomic Theory: The Nuclear Model of the Atom

Chemical Nomenclature

Chemical Formula Relationships

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

When the equation _ Ca(OH)₂ + _ H₃PO₄ → _ Ca₃(PO₄)₂ + _ H₂O is properly balanced,what is the sum of the coefficients?

What is the coefficient for carbon dioxide when the equation _ C₂H₆ + _ O₂ → _ CO₂ + _ H₂O is properly balanced?

When the equation _ PCl₅ + _ H₂O → _ H₃PO₄ + _ HCl is properly balanced,what is the sum of the coefficients?

Barium peroxide,BaO₂,breaks down into barium oxide and oxygen.Write the balanced chemical equation for this reaction.What is the coefficient for barium oxide?