Question 1

In a precipitation reaction the insoluble product can be identified by the symbol ________.

Accepted Answer

A) (aq) 
B) (l) 
C) (g) 
D) (s) 
E) none of the above 
A) (aq) 
B) (l) 
C) (g) 
D) (s) 
E) none of the above

Question 2

When the following reaction is balanced the coefficient in front of carbon dioxide is:
____ C5H12 + ____ O2 → ____ CO2 + ____ H2O

Accepted Answer

A) 5 
B) 6 
C) 12 
D) 10 
A) 5 
B) 6 
C) 12 
D) 10

Question 3

Match the following.
-M (s)+ 2 LX (aq)→ 2 L (s)+ MX2 (aq)

Accepted Answer

A) redox 
B) acid-base 
C) precipitation 
A) redox 
B) acid-base 
C) precipitation

Question 4

Which reaction is an example of a precipitation reaction?

Accepted Answer

A) H2CO3 (aq)→ H2O (l)+ CO2 (g) 
B) H2SO4 (aq)+ Ca(OH)2 (aq)→ CaSO4 (aq)+ 2 H2O (l) 
C) 6 HCl (aq)+ 2 Al (s)→ 2 AlCl3 (aq)+ 3 H2 (g) 
D) FeCl3 (aq)+ 3 KOH (aq)→ Fe(OH)3 (s)+ 3 KCl (aq) 
E) 2 Hg (l)+ O2 (g)→ 2 HgO (s) 
A) H2CO3 (aq)→ H2O (l)+ CO2 (g) 
B) H2SO4 (aq)+ Ca(OH)2 (aq)→ CaSO4 (aq)+ 2 H2O (l) 
C) 6 HCl (aq)+ 2 Al (s)→ 2 AlCl3 (aq)+ 3 H2 (g) 
D) FeCl3 (aq)+ 3 KOH (aq)→ Fe(OH)3 (s)+ 3 KCl (aq) 
E) 2 Hg (l)+ O2 (g)→ 2 HgO (s)

Question 5

When the reaction shown is correctly balanced,the coefficients are:
Li + Br2 → LiBr

Accepted Answer

A) 1,1,1 
B) 1,2,2 
C) 1,2,1 
D) 2,2,1 
E) 2,1,2 
A) 1,1,1 
B) 1,2,2 
C) 1,2,1 
D) 2,2,1 
E) 2,1,2

Question 6

Which reaction is an example of both a precipitation and a neutralization?

Accepted Answer

A) H3PO4 (aq)+ 3 KOH (aq)→ K3PO4 (aq)+ 3 H2O (l) 
B) FeCl3 (aq)+ 3 KOH (aq)→ Fe(OH)3 (s)+ 3 KCl (aq) 
C) .(NH4)2CO3 (s)→ 2 NH3 (g)+ CO2 (g)+ H2O (l) 
D) H2SO4 (aq)+ Ba(OH)2 (aq)→ BaSO4 (s)+ 2 H2O (l) 
E) 2 C (s)+ O2 (g)→ 2 CO (g) 
A) H3PO4 (aq)+ 3 KOH (aq)→ K3PO4 (aq)+ 3 H2O (l) 
B) FeCl3 (aq)+ 3 KOH (aq)→ Fe(OH)3 (s)+ 3 KCl (aq) 
C) .(NH4)2CO3 (s)→ 2 NH3 (g)+ CO2 (g)+ H2O (l) 
D) H2SO4 (aq)+ Ba(OH)2 (aq)→ BaSO4 (s)+ 2 H2O (l) 
E) 2 C (s)+ O2 (g)→ 2 CO (g)

Question 7

The balanced equation for the reaction occurring when iron(III)oxide,a solid,is reduced with pure carbon to produce carbon dioxide and molten iron is

Accepted Answer

A) 2 Fe3O + C (s)→ 6 Fe (l)+ CO2 (g). 
B) 2 FeO3 + 3 C (s)→ 2 Fe (l)+ 3 CO2 (g). 
C) 4 Fe2O3 + 6 C (s)→ 8 Fe (l)+ 6 CO2 (g). 
D) 2 FeO + C (s)→ 2 Fe (l)+ CO2 (g). 
E) 2 Fe2O3 + 3 C (s)→ 4 Fe (l)+ 3 CO2 (g). 
A) 2 Fe3O + C (s)→ 6 Fe (l)+ CO2 (g). 
B) 2 FeO3 + 3 C (s)→ 2 Fe (l)+ 3 CO2 (g). 
C) 4 Fe2O3 + 6 C (s)→ 8 Fe (l)+ 6 CO2 (g). 
D) 2 FeO + C (s)→ 2 Fe (l)+ CO2 (g). 
E) 2 Fe2O3 + 3 C (s)→ 4 Fe (l)+ 3 CO2 (g).

Question 8

Which statement regarding balanced chemical equations is not true?

Accepted Answer

A) The number of each kind of atoms must be the same on each side. 
B) Coefficients are used in front of formulas to balance the equation. 
C) Subscripts may be changed to make an equation simpler to balance. 
D) When no coefficient is written in front of a formula,the number "one" is assumed. 
E) Reactants are written to the left of the arrow. 
A) The number of each kind of atoms must be the same on each side. 
B) Coefficients are used in front of formulas to balance the equation. 
C) Subscripts may be changed to make an equation simpler to balance. 
D) When no coefficient is written in front of a formula,the number "one" is assumed. 
E) Reactants are written to the left of the arrow.

Question 9

When a substance loses electrons it is ________; the substance itself is acting as a(an)________ agent.

Accepted Answer

A) oxidized; oxidizing 
B) oxidized; reducing 
C) reduced; oxidizing 
D) reduced; reducing 
E) dissolved; neutralizing 
A) oxidized; oxidizing 
B) oxidized; reducing 
C) reduced; oxidizing 
D) reduced; reducing 
E) dissolved; neutralizing

Question 10

The oxidation number of iron in the compound FeBr3 is ________.

Accepted Answer

A) -2 
B) -1 
C) +1 
D) +2 
E) +3 
A) -2 
B) -1 
C) +1 
D) +2 
E) +3

Question 11

The net ionic equation for the reaction between zinc and hydrochloric acid solution is

Accepted Answer

A) Zn (s)+ 2 H+ (aq)→ Zn2+ (aq)+ H2 (g). 
B) Zn (s)+ 2 HCl (aq)→ ZnCl2 (aq)+ H2 (g). 
C) Zn2+ (aq)+ H2 (g)→ ZnS (s)+ 2 H+ (aq). 
D) ZnCl2 (aq)+ H2 (g)→ ZnS (s)+ 2 HCl (aq). 
E) none of these 
A) Zn (s)+ 2 H+ (aq)→ Zn2+ (aq)+ H2 (g). 
B) Zn (s)+ 2 HCl (aq)→ ZnCl2 (aq)+ H2 (g). 
C) Zn2+ (aq)+ H2 (g)→ ZnS (s)+ 2 H+ (aq). 
D) ZnCl2 (aq)+ H2 (g)→ ZnS (s)+ 2 HCl (aq). 
E) none of these

Question 12

The balanced equation for the reaction between aqueous ammonium sulfate and aqueous barium acetate is

Accepted Answer

A) (NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (s)+ NH4C2H3O2 (aq). 
B) (NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (s)+ 2 NH4C2H3O2 (aq). 
C) NH4SO4 (aq)+ BaC2H3O2 (aq)→ BaSO4 (s)+ NH4C2H3O2 (aq). 
D) (NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (aq)+ 2 NH4C2H3O2 (s). 
E) (NH4)2SO3 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO3 (aq)+ NH4C2H3O2 (aq). 
A) (NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (s)+ NH4C2H3O2 (aq). 
B) (NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (s)+ 2 NH4C2H3O2 (aq). 
C) NH4SO4 (aq)+ BaC2H3O2 (aq)→ BaSO4 (s)+ NH4C2H3O2 (aq). 
D) (NH4)2SO4 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO4 (aq)+ 2 NH4C2H3O2 (s). 
E) (NH4)2SO3 (aq)+ Ba(C2H3O2)2 (aq)→ BaSO3 (aq)+ NH4C2H3O2 (aq).

Question 13

When the reaction shown is correctly balanced,the coefficients are:
HNO3 + KOH → KNO3 + H2O

Accepted Answer

A) 0,0,0,0 
B) 1,1,1,1 
C) 2,2,2,2 
D) 3,1,1,3 
E) 2,1,2,1 
A) 0,0,0,0 
B) 1,1,1,1 
C) 2,2,2,2 
D) 3,1,1,3 
E) 2,1,2,1

Exam 5: Classification and Balancing of Chemical Reactions

In a precipitation reaction the insoluble product can be identified by the symbol ________.

When the following reaction is balanced the coefficient in front of carbon dioxide is: ____ C5H12 + ____ O2 → ____ CO2 + ____ H2O

Match the following. -M (s)+ 2 LX (aq)→ 2 L (s)+ MX2 (aq)

Which reaction is an example of a precipitation reaction?

When the reaction shown is correctly balanced,the coefficients are: Li + Br2 → LiBr

Which reaction is an example of both a precipitation and a neutralization?

The balanced equation for the reaction occurring when iron(III)oxide,a solid,is reduced with pure carbon to produce carbon dioxide and molten iron is

Which statement regarding balanced chemical equations is not true?

When a substance loses electrons it is ________; the substance itself is acting as a(an)________ agent.

The oxidation number of iron in the compound FeBr3 is ________.

The net ionic equation for the reaction between zinc and hydrochloric acid solution is

The balanced equation for the reaction between aqueous ammonium sulfate and aqueous barium acetate is

When the reaction shown is correctly balanced,the coefficients are: HNO3 + KOH → KNO3 + H2O

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

When the following reaction is balanced the coefficient in front of carbon dioxide is: C₅H₁₂ + O₂ → CO₂ + H₂O

Match the following. -M (s)+ 2 LX (aq)→ 2 L (s)+ MX₂ (aq)

When the reaction shown is correctly balanced,the coefficients are: Li + Br₂ → LiBr

When a substance loses electrons it is ; the substance itself is acting as a(an) agent.

The oxidation number of iron in the compound FeBr₃ is ________.

When the reaction shown is correctly balanced,the coefficients are: HNO₃ + KOH → KNO₃ + H₂O