Question 1

Calcium hydroxide is added to perchloric acid.Write the balanced chemical equation for this reaction.What is the coefficient for perchloric acid?

Accepted Answer

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

Question 2

What is the coefficient for Zn when the equation ___ Zn + ___ H3PO4 → ___ H2 + ___ Zn3(PO4)2 is properly balanced?

Accepted Answer

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

Question 3

Solid aluminum is dropped into a solution of sulfuric acid.Write the balanced chemical equation for this reaction.What is the coefficient for sulfuric acid?

Accepted Answer

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

Question 4

Molten sodium chloride is decomposed into its elements by electrolysis.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 3 or less 
B) 4 
C) 5 
D) 6 
E) 7 or more 
A) 3 or less 
B) 4 
C) 5 
D) 6 
E) 7 or more

Question 5

Bromine is added to a solution of sodium iodide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 4 or less 
B) 5 
C) 6 
D) 7 
E) 8 or more 
A) 4 or less 
B) 5 
C) 6 
D) 7 
E) 8 or more

Question 6

A precipitate forms when solutions of magnesium bromide and sodium hydroxide are combined.Write the balanced chemical equation for this reaction.What is the coefficient for magnesium bromide?

Accepted Answer

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

Question 7

When potassium contacts fluorine gas,potassium fluoride is produced.Write the balanced chemical equation for this reaction.What is the coefficient for potassium fluoride?

Accepted Answer

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

Question 8

Sulfuric acid neutralizes a barium hydroxide solution.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 4 
B) 5 
C) 6 
D) 7 
E) 8 or more 
A) 4 
B) 5 
C) 6 
D) 7 
E) 8 or more

Question 9

Calcium reacts with hydrobromic acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 4 or less 
B) 5 
C) 6 
D) 7 
E) 8 or more 
A) 4 or less 
B) 5 
C) 6 
D) 7 
E) 8 or more

Question 10

Magnesium is placed into sulfuric acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 4 or less 
B) 5 
C) 6 
D) 7 
E) 8 or more 
A) 4 or less 
B) 5 
C) 6 
D) 7 
E) 8 or more

Question 11

Examine the following two beakers.   When the equation for this reaction is balanced,what should the coefficient of Al?

Accepted Answer

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

Question 12

Consider the following particulate-level representation of a chemical equation:   Assume that all spheres represent atoms of A.Which of the following is a correctly balanced equation for this reaction?

Accepted Answer

A) A → 2 A 
B) A2 → 2 A 
C) 2 A → 2 A 
D) A → 1/2 A + 1/2 A 
E) A(s) → A(g) 
A) A → 2 A 
B) A2 → 2 A 
C) 2 A → 2 A 
D) A → 1/2 A + 1/2 A 
E) A(s) → A(g)

Question 13

12.09 g of A2 reacts with 96.00 g of B2 to form 108.09 g of A2B.What is the ratio of the molar mass of A to the molar mass of B?

Accepted Answer

A) 1:8 
B) 8:1 
C) 1:4 
D) 16:1 
E) 1:16 
A) 1:8 
B) 8:1 
C) 1:4 
D) 16:1 
E) 1:16

Question 14

Calcium combines with bromine to make calcium bromide.Write the balanced chemical equation for this reaction.What is the coefficient for bromine?

Accepted Answer

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

Question 15

When atomic phosphorous (P)and oxygen are directly combined,P4O10 is produced.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 3 or less 
B) 5 
C) 7 
D) 9 
E) 10 or more 
A) 3 or less 
B) 5 
C) 7 
D) 9 
E) 10 or more

Question 16

Calcium reacts with the oxygen in the air,forming calcium oxide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 3 or less 
B) 4 
C) 5 
D) 6 
E) 7 or more 
A) 3 or less 
B) 4 
C) 5 
D) 6 
E) 7 or more

Question 17

What is the coefficient for H2 when the equation ___ Ba + ___ H3AsO4 → ___ H2 + ___ Ba3(AsO4)2 is properly balanced?

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 2 
E) 6 
A) 1 
B) 3 
C) 5 
D) 2 
E) 6

Question 18

Solid magnesium hydroxide is added to hydrochloric acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 4 
B) 5 
C) 6 
D) 7 
E) 8 or more 
A) 4 
B) 5 
C) 6 
D) 7 
E) 8 or more

Question 19

Consider the following particulate-level representation.The larger spheres represent N and the smaller spheres represent H.   Which of the following correctly characterizes this representation?

Accepted Answer

A) The reactant could be represented as NH3. 
B) The products of the reaction are N2 and H2. 
C) The equation is "balanced". 
D) If the equation for the reaction were written as shown above the coefficient of the nitrogen containing product would be 4. 
E) All of these correctly characterize this reaction. 
A) The reactant could be represented as NH3. 
B) The products of the reaction are N2 and H2. 
C) The equation is "balanced". 
D) If the equation for the reaction were written as shown above the coefficient of the nitrogen containing product would be 4. 
E) All of these correctly characterize this reaction.

Question 20

Ammonia is formed from its elements.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Accepted Answer

A) 3 or less 
B) 4 
C) 5 
D) 6 
E) 7 or more 
A) 3 or less 
B) 4 
C) 5 
D) 6 
E) 7 or more

Exam 8: Chemical Reactions

Calcium hydroxide is added to perchloric acid.Write the balanced chemical equation for this reaction.What is the coefficient for perchloric acid?

What is the coefficient for Zn when the equation ___ Zn + ___ H3PO4 → ___ H2 + ___ Zn3(PO4)2 is properly balanced?

Solid aluminum is dropped into a solution of sulfuric acid.Write the balanced chemical equation for this reaction.What is the coefficient for sulfuric acid?

Molten sodium chloride is decomposed into its elements by electrolysis.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Bromine is added to a solution of sodium iodide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

A precipitate forms when solutions of magnesium bromide and sodium hydroxide are combined.Write the balanced chemical equation for this reaction.What is the coefficient for magnesium bromide?

When potassium contacts fluorine gas,potassium fluoride is produced.Write the balanced chemical equation for this reaction.What is the coefficient for potassium fluoride?

Sulfuric acid neutralizes a barium hydroxide solution.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Calcium reacts with hydrobromic acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Magnesium is placed into sulfuric acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Examine the following two beakers. When the equation for this reaction is balanced,what should the coefficient of Al?

Consider the following particulate-level representation of a chemical equation: Assume that all spheres represent atoms of A.Which of the following is a correctly balanced equation for this reaction?

12.09 g of A2 reacts with 96.00 g of B2 to form 108.09 g of A2B.What is the ratio of the molar mass of A to the molar mass of B?

Calcium combines with bromine to make calcium bromide.Write the balanced chemical equation for this reaction.What is the coefficient for bromine?

When atomic phosphorous (P)and oxygen are directly combined,P4O10 is produced.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Calcium reacts with the oxygen in the air,forming calcium oxide.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

What is the coefficient for H2 when the equation ___ Ba + ___ H3AsO4 → ___ H2 + ___ Ba3(AsO4)2 is properly balanced?

Solid magnesium hydroxide is added to hydrochloric acid.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

Consider the following particulate-level representation.The larger spheres represent N and the smaller spheres represent H. Which of the following correctly characterizes this representation?

Ammonia is formed from its elements.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

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

What is the coefficient for Zn when the equation _ Zn + _ H₃PO₄ → _ H₂ + _ Zn₃(PO₄)₂ is properly balanced?

12.09 g of A₂ reacts with 96.00 g of B₂ to form 108.09 g of A₂B.What is the ratio of the molar mass of A to the molar mass of B?

When atomic phosphorous (P)and oxygen are directly combined,P₄O₁₀ is produced.Write the balanced chemical equation for this reaction.What is the sum of the coefficients?

What is the coefficient for H₂ when the equation _ Ba + _ H₃AsO₄ → _ H₂ + _ Ba₃(AsO₄)₂ is properly balanced?