Question 1

Write and balance the following acid-base neutralization reaction:
HBr(aq)+ Li2CO3(aq)→

Accepted Answer

2 HBr(aq) + Li₂CO₃(aq) → 2 LiBr(aq) + H₂O(l) + CO₂(g)

Question 2

The balanced equation for the reaction occurring when calcium nitrate solution is mixed with sodium phosphate solution is

Accepted Answer

A) 3 Ca(NO3)2(aq)+ 2 Na3PO4(aq)→ Ca3(PO4)2(aq)+ 6 NaNO3(aq). 
B) 2 Ca(NO3)2(aq)+ 3 Na3PO4(aq)→ 2 Ca3(PO4)2(s)+ 6 NaNO3(aq). 
C) 3 CaNO3(aq)+ Na3PO4(aq)→ Ca3PO4(aq)+ 3 NaNO3(s). 
D) 3 Ca(NO3)2(aq)+ 2 Na3PO4(aq)→ Ca3(PO4)2(s)+ 6 NaNO3(aq). 
E) Ca(NO3)2(aq)+ 2 NaPO4(aq)→ Ca(PO4)2(s)+ 2 NaNO3(aq). 
A) 3 Ca(NO3)2(aq)+ 2 Na3PO4(aq)→ Ca3(PO4)2(aq)+ 6 NaNO3(aq). 
B) 2 Ca(NO3)2(aq)+ 3 Na3PO4(aq)→ 2 Ca3(PO4)2(s)+ 6 NaNO3(aq). 
C) 3 CaNO3(aq)+ Na3PO4(aq)→ Ca3PO4(aq)+ 3 NaNO3(s). 
D) 3 Ca(NO3)2(aq)+ 2 Na3PO4(aq)→ Ca3(PO4)2(s)+ 6 NaNO3(aq). 
E) Ca(NO3)2(aq)+ 2 NaPO4(aq)→ Ca(PO4)2(s)+ 2 NaNO3(aq). D

Question 3

In the correctly balanced reaction,the coefficient for H2O is:
________ Al(OH)3 + ________ H2SO4 → ________ Al2(SO4)3 + ________ H2O

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 6 
E) 8 
A) 1 
B) 2 
C) 3 
D) 6 
E) 8 D

Question 4

When the reaction shown is balanced,there are ________ atoms of oxygen and ________ atoms of hydrogen on each side.
_______ (NH4)2SO4(aq)+ _______ Ba(C2H3O2)2(aq)→ _______ BaSO4(s)+ _______ NH4C2H3O2(aq)

Accepted Answer

A) 6;11 
B) 16;18 
C) 8;14 
D) 4;7 
E) 16;28 
A) 6;11 
B) 16;18 
C) 8;14 
D) 4;7 
E) 16;28

Question 5

The combination of ions most likely to produce a precipitate is

Accepted Answer

A) Li+ and PO43-. 
B) Pb2+ and NO3-. 
C) NH4+ and SO42-. 
D) Fe3+ and OH-. 
E) Mg2+ and C2H3O2-. 
A) Li+ and PO43-. 
B) Pb2+ and NO3-. 
C) NH4+ and SO42-. 
D) Fe3+ and OH-. 
E) Mg2+ and C2H3O2-.

Question 6

In the reaction shown,________ is the oxidizing agent because it ________.
Ni(s)+ CuCl2(aq)→ Cu(s)+ NiCl2(aq)

Accepted Answer

A) Ni;causes reduction 
B) Ni;gets reduced 
C) CuCl2;causes reduction 
D) CuCl2;gets reduced 
E) NiCl2;gets reduced 
A) Ni;causes reduction 
B) Ni;gets reduced 
C) CuCl2;causes reduction 
D) CuCl2;gets reduced 
E) NiCl2;gets reduced

Question 7

When the following reaction is balanced,the coefficient in front of oxygen is:
________ C8H18 + ________ O2 → ________ CO2 + ________ H2O

Accepted Answer

A) 25 
B) 12 
C) 18 
D) 9 
E) 17 
A) 25 
B) 12 
C) 18 
D) 9 
E) 17

Question 8

What is the oxidation number of oxygen in hydrogen peroxide,H2O2?

Accepted Answer

A) 0 
B) -1 
C) -2 
D) +1 
E) +2 
A) 0 
B) -1 
C) -2 
D) +1 
E) +2

Question 9

Match the following.
-LX(aq)+ MY(aq)→ LY(s)+ MX(aq)

Accepted Answer

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

Question 10

Write and balance the following acid-base neutralization reaction:
KOH(aq)+ H2SO4 aq)→

Accepted Answer

2 KOH(aq)

Question 11

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 12

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

Question 13

When the reaction shown is correctly balanced,the coefficients are:
________ HBr + ________ Ca(OH)2 → ________ CaBr2 + ________ H2O

Accepted Answer

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

Question 14

When the reaction shown is correctly balanced,the coefficients are:
________ C6H14(l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(g)

Accepted Answer

A) 1;6;6;7 
B) 2;19;12;14 
C) 1;3.5;6;7 
D) 1;9.5;6;7 
E) 2;16.5;12;7 
A) 1;6;6;7 
B) 2;19;12;14 
C) 1;3.5;6;7 
D) 1;9.5;6;7 
E) 2;16.5;12;7

Question 15

The oxidation number of sulfur in calcium sulfate,CaSO4,is

Accepted Answer

A) +6. 
B) +4. 
C) +2. 
D) 0. 
E) -2. 
A) +6. 
B) +4. 
C) +2. 
D) 0. 
E) -2.

Question 16

In order to form the salt calcium sulfate,which acid and base combination should you choose?

Accepted Answer

A) H2SO3 and CaOH 
B) H2SO4 and CaOH 
C)  H2SO3 and Ca(OH)2 
D)  H2SO4 and Ca(OH)2 
E) none of the above 
A) H2SO3 and CaOH 
B) H2SO4 and CaOH 
C)  H2SO3 and Ca(OH)2 
D)  H2SO4 and Ca(OH)2 
E) none of the above

Question 17

In a balanced chemical equation

Accepted Answer

A) there are equal numbers of atoms on each side of the reaction arrow. 
B) there are equal numbers of molecules on each side of the reaction arrow. 
C) there are always the same number of products as there are reactants. 
D) the number of atoms present in a reaction can vary when the conditions change during the reaction. 
E) none of the above 
A) there are equal numbers of atoms on each side of the reaction arrow. 
B) there are equal numbers of molecules on each side of the reaction arrow. 
C) there are always the same number of products as there are reactants. 
D) the number of atoms present in a reaction can vary when the conditions change during the reaction. 
E) none of the above

Question 18

All of the reactions shown are oxidation-reduction reactions except

Accepted Answer

A) N2(g)+ O2(g)→ 2 NO(g). 
B) 2 Fe2O3(s)→ 4 Fe(s)+ 3 O2(g). 
C) Zn(s)+ 2 HCl(aq)→ ZnCl2(aq)+ H2(g). 
D) 2 NaI(aq)+ Cl2(g)→ 2 NaCl(aq)+ I2. 
E) K2SO4(aq)+ BaCl2(aq)→ BaSO4(s)+ 2 KCl(aq). 
A) N2(g)+ O2(g)→ 2 NO(g). 
B) 2 Fe2O3(s)→ 4 Fe(s)+ 3 O2(g). 
C) Zn(s)+ 2 HCl(aq)→ ZnCl2(aq)+ H2(g). 
D) 2 NaI(aq)+ Cl2(g)→ 2 NaCl(aq)+ I2. 
E) K2SO4(aq)+ BaCl2(aq)→ BaSO4(s)+ 2 KCl(aq).

Question 19

Which of the following is always a spectator ion in aqueous chemical reactions?

Accepted Answer

A) Na+ 
B) Cl- 
C) S2- 
D) Mg2+ 
E) all of these ions. 
A) Na+ 
B) Cl- 
C) S2- 
D) Mg2+ 
E) all of these ions.

Question 20

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 
E) 11 
A) 5 
B) 6 
C) 12 
D) 10 
E) 11

Exam 5: Classification and Balancing of Chemical Reactions

Write and balance the following acid-base neutralization reaction: HBr(aq)+ Li2CO3(aq)→

The balanced equation for the reaction occurring when calcium nitrate solution is mixed with sodium phosphate solution is

In the correctly balanced reaction,the coefficient for H2O is: ________ Al(OH)3 + ________ H2SO4 → ________ Al2(SO4)3 + ________ H2O

When the reaction shown is balanced,there are ________ atoms of oxygen and ________ atoms of hydrogen on each side. _______ (NH4)2SO4(aq)+ _______ Ba(C2H3O2)2(aq)→ _______ BaSO4(s)+ _______ NH4C2H3O2(aq)

The combination of ions most likely to produce a precipitate is

In the reaction shown,________ is the oxidizing agent because it ________. Ni(s)+ CuCl2(aq)→ Cu(s)+ NiCl2(aq)

When the following reaction is balanced,the coefficient in front of oxygen is: ________ C8H18 + ________ O2 → ________ CO2 + ________ H2O

What is the oxidation number of oxygen in hydrogen peroxide,H2O2?

Match the following. -LX(aq)+ MY(aq)→ LY(s)+ MX(aq)

Write and balance the following acid-base neutralization reaction: KOH(aq)+ H2SO4 aq)→

The oxidation number of iron in the compound FeBr3 is

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

When the reaction shown is correctly balanced,the coefficients are: ________ HBr + ________ Ca(OH)2 → ________ CaBr2 + ________ H2O

When the reaction shown is correctly balanced,the coefficients are: ________ C6H14(l)+ ________ O2(g)→ ________ CO2(g)+ ________ H2O(g)

The oxidation number of sulfur in calcium sulfate,CaSO4,is

In order to form the salt calcium sulfate,which acid and base combination should you choose?

In a balanced chemical equation

All of the reactions shown are oxidation-reduction reactions except

Which of the following is always a spectator ion in aqueous chemical reactions?

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

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

Write and balance the following acid-base neutralization reaction: HBr(aq)+ Li₂CO₃(aq)→

In the correctly balanced reaction,the coefficient for H₂O is: Al(OH)₃ + H₂SO₄ → Al₂(SO₄)₃ + H₂O

When the reaction shown is balanced,there are ____ atoms of oxygen and atoms of hydrogen on each side. _ (NH₄)₂SO₄(aq)+ _ Ba(C₂H₃O₂)₂(aq)→ _ BaSO₄(s)+ _____ NH₄C₂H₃O₂(aq)

In the reaction shown, is the oxidizing agent because it . Ni(s)+ CuCl₂(aq)→ Cu(s)+ NiCl₂(aq)

When the following reaction is balanced,the coefficient in front of oxygen is: C₈H₁₈ + O₂ → CO₂ + H₂O

What is the oxidation number of oxygen in hydrogen peroxide,H₂O₂?

Write and balance the following acid-base neutralization reaction: KOH(aq)+ H₂SO₄ aq)→

The oxidation number of iron in the compound FeBr₃ is

When the reaction shown is correctly balanced,the coefficients are: HBr + Ca(OH)₂ → CaBr₂ + H₂O

When the reaction shown is correctly balanced,the coefficients are: C₆H₁₄(l)+ O₂(g)→ CO₂(g)+ H₂O(g)

The oxidation number of sulfur in calcium sulfate,CaSO₄,is

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