Question 1

Which is the correct equation for the reaction of magnesium with hydrochloric acid to produce hydrogen and magnesium chloride?

Accepted Answer

A) Mg + 2 HCl → H2 + MgCl2 
B) Mg + HCl → H + MgCl 
C) 2 Mg + 6 HCl → 3 H2 + 2 MgCl2 
D) Mg + 2 HCl → 2 H + MgCl2 
E) Mg + 3 HCl → 3 H + MgCl2 
A) Mg + 2 HCl → H2 + MgCl2 
B) Mg + HCl → H + MgCl 
C) 2 Mg + 6 HCl → 3 H2 + 2 MgCl2 
D) Mg + 2 HCl → 2 H + MgCl2 
E) Mg + 3 HCl → 3 H + MgCl2

Question 2

Which of the following equations is not balanced?

Accepted Answer

A) 2 Na + 2 H2O → 2 NaOH + H2 
B) C3H8 + 5 O2 → 3 CO2 + 4 H2O 
C) 2 H2 + O2 → 2 H2O 
D) SO2 + O2 → SO3 
E) 2 Al + 6 HCl → 2 AlCl3 + 3 H2 
A) 2 Na + 2 H2O → 2 NaOH + H2 
B) C3H8 + 5 O2 → 3 CO2 + 4 H2O 
C) 2 H2 + O2 → 2 H2O 
D) SO2 + O2 → SO3 
E) 2 Al + 6 HCl → 2 AlCl3 + 3 H2

Question 3

Match the following.
-HR(aq)+ XOH(aq)→ XR(aq)+   O(l)

Accepted Answer

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

Question 4

The oxidation number of chlorine in the compound FeCl3 is

Accepted Answer

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

Question 5

Which of the following is not soluble in water?

Accepted Answer

A) potassium sulfide 
B) iron(II)bromide 
C) iron(III)hydroxide 
D) iron(III)nitrate 
E) ammonium sulfate 
A) potassium sulfide 
B) iron(II)bromide 
C) iron(III)hydroxide 
D) iron(III)nitrate 
E) ammonium sulfate

Question 6

In the redox reaction shown,________ is oxidized and becomes ________.
Fe(s)+ CuCl2 aq)→ Cu(s)+ FeCl2(aq)

Accepted Answer

A) Fe;Fe+ 
B) Fe;Fe2+ 
C) Cu;Cu2+ 
D) Cu2+;Cu 
E) none of the above 
A) Fe;Fe+ 
B) Fe;Fe2+ 
C) Cu;Cu2+ 
D) Cu2+;Cu 
E) none of the above

Question 7

Which one of the following substances is produced during an acid/base (or neutralization)reaction?

Accepted Answer

A) H2 
B) H2O 
C) CO2 
D) NaOH 
E) NaCl 
A) H2 
B) H2O 
C) CO2 
D) NaOH 
E) NaCl

Question 8

In the following reaction which species is being oxidized and which is being reduced?
2 Cr(s)+ 3 Cl2(g)→ 2 CrCl3(s)

Accepted Answer

A) oxidized: Cr;reduced: CrCl3 
B) oxidized:CrCl3;reduced: Cr 
C) oxidized: Cr;reduced: Cl2 
D) oxidized: Cl2;reduced: Cr 
E) oxidized: Cl2;reduced: CrCl3 
A) oxidized: Cr;reduced: CrCl3 
B) oxidized:CrCl3;reduced: Cr 
C) oxidized: Cr;reduced: Cl2 
D) oxidized: Cl2;reduced: Cr 
E) oxidized: Cl2;reduced: CrCl3

Question 9

When the reaction shown is correctly balanced,the coefficients are:
________ KClO3 → ________ KCl + ________ O2

Accepted Answer

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

Question 10

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 11

Which of the following equations is not balanced?

Accepted Answer

A) C7H16 + O2 → 7 CO2 + 8 H2O 
B) K2CrO4 + Pb(NO3)2 → 2 KNO3 + PbCrO4 
C) 4 Fe3O4 + O2 → 6 Fe2O3 
D) 3 AgNO3 + (NH4)3PO4 → Ag3PO4 + 3 NH4NO3 
E) 2 Al2O3 → 4 Al + 3 O2 
A) C7H16 + O2 → 7 CO2 + 8 H2O 
B) K2CrO4 + Pb(NO3)2 → 2 KNO3 + PbCrO4 
C) 4 Fe3O4 + O2 → 6 Fe2O3 
D) 3 AgNO3 + (NH4)3PO4 → Ag3PO4 + 3 NH4NO3 
E) 2 Al2O3 → 4 Al + 3 O2

Question 12

When potassium hydroxide and hydrobromic acid are combined the products are

Accepted Answer

A) potassium bromide and water. 
B) potasium bromate and water. 
C) potassium bromide and hydrogen gas. 
D) potassium hypobromite and water. 
E) potassium bromite and hydrogen gas. 
A) potassium bromide and water. 
B) potasium bromate and water. 
C) potassium bromide and hydrogen gas. 
D) potassium hypobromite and water. 
E) potassium bromite and hydrogen gas.

Question 13

Consider the balanced equation shown and identify the statement that is not true.
Na2SO4(aq)+ BaCl2(aq)→ 2 NaCl(aq)+ BaSO4(s)

Accepted Answer

A) The coefficient of sodium sulfate is one. 
B) Barium sulfate is produced in solid form. 
C) Barium chloride is dissolved in water. 
D) The products are barium sulfate and sodium chloride. 
E) 2 NaCl (aq)could also be correctly written as Na2Cl2 (aq). 
A) The coefficient of sodium sulfate is one. 
B) Barium sulfate is produced in solid form. 
C) Barium chloride is dissolved in water. 
D) The products are barium sulfate and sodium chloride. 
E) 2 NaCl (aq)could also be correctly written as Na2Cl2 (aq).

Question 14

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 15

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 16

The scientific principle which is the basis for balancing chemical equations is

Accepted Answer

A) the Law of Conservation of Energy. 
B) the Law of Conservation of Mass. 
C) the Law of Conservation of Mass and Energy. 
D) the Law of Definite Proportions. 
E) Avogadro's Law. 
A) the Law of Conservation of Energy. 
B) the Law of Conservation of Mass. 
C) the Law of Conservation of Mass and Energy. 
D) the Law of Definite Proportions. 
E) Avogadro's Law.

Question 17

Which reaction is an example of an acid-base 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 18

The element chlorine is very reactive as a(an)________ agent because it readily ________ electrons to form the chloride ion.

Accepted Answer

A) oxidizing;loses 
B) oxidizing;gains 
C) reducing;loses 
D) reducing;gains 
E) none of the above 
A) oxidizing;loses 
B) oxidizing;gains 
C) reducing;loses 
D) reducing;gains 
E) none of the above

Question 19

All of the statements regarding redox reactions are true except

Accepted Answer

A) a reducing agent causes another substance to be reduced. 
B) halogens usually behave as oxidizing agents because they readily gain electrons. 
C) metal ions are produced when pure metals are oxidized. 
D) when a substance is oxidized its charge (or oxidation number)decreases. 
E) alkali metals often behave as reducing agents because they readily lose electrons. 
A) a reducing agent causes another substance to be reduced. 
B) halogens usually behave as oxidizing agents because they readily gain electrons. 
C) metal ions are produced when pure metals are oxidized. 
D) when a substance is oxidized its charge (or oxidation number)decreases. 
E) alkali metals often behave as reducing agents because they readily lose electrons.

Question 20

The following reaction can be classified as what type(s)of reaction(s)?
2 Al(OH)3(aq)+ 3 H2SO4(aq)→ Al2(SO4)3(s)+ 6 H2O(l)

Accepted Answer

A) precipitation 
B) acid-base neutralization 
C) redox reaction 
D) combustion 
E) both A and B 
A) precipitation 
B) acid-base neutralization 
C) redox reaction 
D) combustion 
E) both A and B

Exam 5: Classification and Balancing of Chemical Reactions

Which is the correct equation for the reaction of magnesium with hydrochloric acid to produce hydrogen and magnesium chloride?

Which of the following equations is not balanced?

Match the following. -HR(aq)+ XOH(aq)→ XR(aq)+ O(l)

The oxidation number of chlorine in the compound FeCl3 is

Which of the following is not soluble in water?

In the redox reaction shown,________ is oxidized and becomes ________. Fe(s)+ CuCl2 aq)→ Cu(s)+ FeCl2(aq)

Which one of the following substances is produced during an acid/base (or neutralization)reaction?

In the following reaction which species is being oxidized and which is being reduced? 2 Cr(s)+ 3 Cl2(g)→ 2 CrCl3(s)

When the reaction shown is correctly balanced,the coefficients are: ________ KClO3 → ________ KCl + ________ O2

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

Which of the following equations is not balanced?

When potassium hydroxide and hydrobromic acid are combined the products are

Consider the balanced equation shown and identify the statement that is not true. Na2SO4(aq)+ BaCl2(aq)→ 2 NaCl(aq)+ BaSO4(s)

Which reaction is an example of a precipitation reaction?

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

The scientific principle which is the basis for balancing chemical equations is

Which reaction is an example of an acid-base reaction?

The element chlorine is very reactive as a(an)________ agent because it readily ________ electrons to form the chloride ion.

All of the statements regarding redox reactions are true except

The following reaction can be classified as what type(s)of reaction(s)? 2 Al(OH)3(aq)+ 3 H2SO4(aq)→ Al2(SO4)3(s)+ 6 H2O(l)

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

The oxidation number of chlorine in the compound FeCl₃ is

In the redox reaction shown, is oxidized and becomes . Fe(s)+ CuCl₂ aq)→ Cu(s)+ FeCl₂(aq)

In the following reaction which species is being oxidized and which is being reduced? 2 Cr(s)+ 3 Cl₂(g)→ 2 CrCl₃(s)

When the reaction shown is correctly balanced,the coefficients are: KClO₃ → KCl + O₂

Consider the balanced equation shown and identify the statement that is not true. Na₂SO₄(aq)+ BaCl₂(aq)→ 2 NaCl(aq)+ BaSO₄(s)

The element chlorine is very reactive as a(an) agent because it readily electrons to form the chloride ion.

The following reaction can be classified as what type(s)of reaction(s)? 2 Al(OH)₃(aq)+ 3 H₂SO₄(aq)→ Al₂(SO₄)₃(s)+ 6 H₂O(l)