Question 1

Select the classification for the following reaction.
2NaCl(l)  
2Na(l)+ Cl2(g)

Accepted Answer

A) acid-base 
B) precipitation 
C) combination 
D) displacement 
E) decomposition 
A) acid-base 
B) precipitation 
C) combination 
D) displacement 
E) decomposition

Question 2

The oxidation numbers of P,S and Cl in H2PO2-,H2S and KClO4 are,respectively

Accepted Answer

A) -1,-1,+3 
B) +1,-2,+7 
C) +1,+2,+7 
D) -1,-2,+7 
E) -1,-2,+3 
A) -1,-1,+3 
B) +1,-2,+7 
C) +1,+2,+7 
D) -1,-2,+7 
E) -1,-2,+3

Question 3

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products.
a.BaCl2(aq)+ Na2SO4(aq) $\to$
b.Mg(NO3)2(aq)+ KOH(aq) $\to$

Accepted Answer

a.BaCl₂(aq)+ Na

Question 4

In a redox reaction,the reducing agent undergoes loss of electrons.

Accepted Answer

A) True 
 B)False

Question 5

Calculate the oxidation number of sulfur in sodium metabisulfite,Na2S2O5.

Accepted Answer

A) -2 
B) +2 
C) +4 
D) +5 
E) None of these is the correct oxidation number. 
A) -2 
B) +2 
C) +4 
D) +5 
E) None of these is the correct oxidation number.

Question 6

Which one of the following is a redox reaction?

Accepted Answer

A) 2Na(g)+ Cl2(g) $\to$2NaCl(s) 
B) Ba2+(aq)+ SO42-(aq) $\to$ BaSO4(s) 
C) K2Cr2O7(aq)+ 2KOH(aq) $\to$ 2K2CrO4(aq)+ H2O(l) 
D) Na2CO3(s)+ 2HCl(aq) $\to$ 2NaCl(aq)+ CO2(g)+ H2O(l) 
E) H2O(l) $\to$ H+(aq)+ OH-(aq) 
A) 2Na(g)+ Cl2(g) $\to$2NaCl(s) 
B) Ba2+(aq)+ SO42-(aq) $\to$ BaSO4(s) 
C) K2Cr2O7(aq)+ 2KOH(aq) $\to$ 2K2CrO4(aq)+ H2O(l) 
D) Na2CO3(s)+ 2HCl(aq) $\to$ 2NaCl(aq)+ CO2(g)+ H2O(l) 
E) H2O(l) $\to$ H+(aq)+ OH-(aq)

Question 7

Select the classification for the following reaction.
KOH(aq)+ HCl(aq) $\to$ KCl(aq)+ H2O(l)

Accepted Answer

A) precipitation 
B) acid-base 
C) redox 
D) combination 
E) None of these choices is correct. 
A) precipitation 
B) acid-base 
C) redox 
D) combination 
E) None of these choices is correct.

Question 8

a.Explain or define what is meant by the term "oxidation".
b.Write down the oxidation numbers of the atoms in the following formulas.

Accepted Answer

a.Oxidation: loss of

Question 9

In a redox reaction,the oxidizing agent undergoes loss of electrons.

Accepted Answer

A) True 
 B)False

Question 10

Select the classification for the following reaction.
CaCl2·H2O(s)  
CaCl2(s)+ H2O(g)

Accepted Answer

A) combination 
B) decomposition 
C) displacement 
D) acid-base 
E) precipitation 
A) combination 
B) decomposition 
C) displacement 
D) acid-base 
E) precipitation

Question 11

Predict the products by completing a balanced equation for the following decomposition reaction.
CaCl2(l)  
?

Accepted Answer

A) CaCl2(l)
 
Ca(l)+ 2Cl-(l) 
B) CaCl2(l)
 
Ca2+(l)+ Cl2(g) 
C) CaCl2(l)
 
Ca2+(l)+ 2Cl-(l) 
D) CaCl2(l)
 
Ca(l)+ Cl2(g) 
E) CaCl2(l)
 
CaCl(l)+ Cl-(l) 
A) CaCl2(l)
 
Ca(l)+ 2Cl-(l) 
B) CaCl2(l)
 
Ca2+(l)+ Cl2(g) 
C) CaCl2(l)
 
Ca2+(l)+ 2Cl-(l) 
D) CaCl2(l)
 
Ca(l)+ Cl2(g) 
E) CaCl2(l)
 
CaCl(l)+ Cl-(l)

Question 12

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid.
LiOH(aq)+ HBr(aq) $\to$ H2O(l)+ LiBr(aq)

Accepted Answer

A) LiOH(aq) $\to$ Li+(aq)+ OH-(aq) 
B) HBr(aq) $\to$H+(aq)+ Br-(aq) 
C) H+(aq)+ OH-(aq) $\to$ H2O(l) 
D) Li+(aq)+ Br-(aq) $\to$ LiBr(aq) 
E) Li+(aq)+ OH-(aq)+ H+(aq)+ Br-(aq) $\to$ H2O(l)+ LiBr(aq) 
A) LiOH(aq) $\to$ Li+(aq)+ OH-(aq) 
B) HBr(aq) $\to$H+(aq)+ Br-(aq) 
C) H+(aq)+ OH-(aq) $\to$ H2O(l) 
D) Li+(aq)+ Br-(aq) $\to$ LiBr(aq) 
E) Li+(aq)+ OH-(aq)+ H+(aq)+ Br-(aq) $\to$ H2O(l)+ LiBr(aq)

Question 13

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products.
a.AgNO3(aq)+ CaCl2(aq) $\to$
b.NaOH(aq)+ Fe(NO3)3(aq)$\to$

Accepted Answer

a.2AgNO₃(aq)+ CaCl<

Question 14

Automobile batteries use 3.0 M H2SO4 as an electrolyte.How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid?
H2SO4(aq)+ 2NaOH(aq) $\to$ 2H2O(l)+ Na2SO4(aq)

Accepted Answer

A) 0.045 L 
B) 0.28 L 
C) 0.56 L 
D) 0.90 L 
E) 1.1 L 
A) 0.045 L 
B) 0.28 L 
C) 0.56 L 
D) 0.90 L 
E) 1.1 L

Question 15

Which of the following is a weak acid?

Accepted Answer

A) H2SO4 
B) HNO3 
C) HF 
D) HBr 
E) HCl 
A) H2SO4 
B) HNO3 
C) HF 
D) HBr 
E) HCl

Question 16

Select the classification for the following reaction.
2H2O2(aq) $\to$ 2H2O(l)+ O2(g)

Accepted Answer

A) combination 
B) decomposition 
C) displacement 
D) acid-base 
E) None of these choices is correct. 
A) combination 
B) decomposition 
C) displacement 
D) acid-base 
E) None of these choices is correct.

Question 17

Which one of the following is not a redox reaction?

Accepted Answer

A) 2Na(s)+ 2H2O(l) $\to$ 2NaOH(aq)+ H2(g) 
B) H2(g)+ Cl2(g) $\to$ 2HCl(g) 
C) 2H2O2(aq) $\to$ 2H2O(l)+ O2(g) 
D) Fe2O3(s)+ 3H2SO4(aq) $\to$ Fe2(SO4)3(aq)+ 3H2O(l) 
E) 2KMnO4(aq)+ 10FeSO4(aq)+ 8H2SO4(aq) $\to$
K2SO4(aq)+ 2MnSO4(aq)+ 5Fe2(SO4)3(aq)+ 8H2O(l) 
A) 2Na(s)+ 2H2O(l) $\to$ 2NaOH(aq)+ H2(g) 
B) H2(g)+ Cl2(g) $\to$ 2HCl(g) 
C) 2H2O2(aq) $\to$ 2H2O(l)+ O2(g) 
D) Fe2O3(s)+ 3H2SO4(aq) $\to$ Fe2(SO4)3(aq)+ 3H2O(l) 
E) 2KMnO4(aq)+ 10FeSO4(aq)+ 8H2SO4(aq) $\to$
K2SO4(aq)+ 2MnSO4(aq)+ 5Fe2(SO4)3(aq)+ 8H2O(l)

Question 18

In each of the following cases,write down the oxidation number of the indicated atom.
a.P in P4
b.C in C2H6
 c.S in H2SO4
 d.Mn in MnO4-
 e.S in S4O62-
 f.P in Na3PO4

Accepted Answer

a.0
b.-3
c

Question 19

Vinegar is a solution of acetic acid,CH3COOH,dissolved in water.A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH.What is the percent by weight of acetic acid in the vinegar?

Accepted Answer

A) 0.184% 
B) 1.63% 
C) 3.26% 
D) 5.43% 
E) 9.23% 
A) 0.184% 
B) 1.63% 
C) 3.26% 
D) 5.43% 
E) 9.23%

Question 20

Which one of the following is not a redox reaction?

Accepted Answer

A) 2H2(g)+ O2(g) $\to$ 2H2O(l) 
B) Zn(s)+ H2SO4(aq) $\to$ ZnSO4(aq)+ H2(g) 
C) H2O(l)+ NH3(g) $\to$ NH4+(aq)+ OH-(aq) 
D) 6FeSO4(aq)+ K2Cr2O7(aq)+ 7H2SO4(aq) $\to$
Cr2(SO4)3(aq)+ 3Fe2(SO4)3(aq)+ K2SO4(aq)+ 7H2O(l) 
E) Cl2(g)+ 2KBr(aq) $\to$ Br2(l)+ 2KCl(aq) 
A) 2H2(g)+ O2(g) $\to$ 2H2O(l) 
B) Zn(s)+ H2SO4(aq) $\to$ ZnSO4(aq)+ H2(g) 
C) H2O(l)+ NH3(g) $\to$ NH4+(aq)+ OH-(aq) 
D) 6FeSO4(aq)+ K2Cr2O7(aq)+ 7H2SO4(aq) $\to$
Cr2(SO4)3(aq)+ 3Fe2(SO4)3(aq)+ K2SO4(aq)+ 7H2O(l) 
E) Cl2(g)+ 2KBr(aq) $\to$ Br2(l)+ 2KCl(aq)

Exam 4: Three Major Classes of Chemical Reactions

Select the classification for the following reaction. 2NaCl(l) 2Na(l)+ Cl2(g)

The oxidation numbers of P,S and Cl in H2PO2-,H2S and KClO4 are,respectively

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products. a.BaCl2(aq)+ Na2SO4(aq) →\to→ b.Mg(NO3)2(aq)+ KOH(aq) →\to→

In a redox reaction,the reducing agent undergoes loss of electrons.

Calculate the oxidation number of sulfur in sodium metabisulfite,Na2S2O5.

Which one of the following is a redox reaction?

Select the classification for the following reaction. KOH(aq)+ HCl(aq) →\to→ KCl(aq)+ H2O(l)

a.Explain or define what is meant by the term "oxidation". b.Write down the oxidation numbers of the atoms in the following formulas.

In a redox reaction,the oxidizing agent undergoes loss of electrons.

Select the classification for the following reaction. CaCl2·H2O(s) CaCl2(s)+ H2O(g)

Predict the products by completing a balanced equation for the following decomposition reaction. CaCl2(l) ?

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq)+ HBr(aq) →\to→ H2O(l)+ LiBr(aq)

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products. a.AgNO3(aq)+ CaCl2(aq) →\to→ b.NaOH(aq)+ Fe(NO3)3(aq) →\to→

Automobile batteries use 3.0 M H2SO4 as an electrolyte.How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H2SO4(aq)+ 2NaOH(aq) →\to→ 2H2O(l)+ Na2SO4(aq)

Which of the following is a weak acid?

Select the classification for the following reaction. 2H2O2(aq) →\to→ 2H2O(l)+ O2(g)

Which one of the following is not a redox reaction?

In each of the following cases,write down the oxidation number of the indicated atom. a.P in P4 b.C in C2H6 c.S in H2SO4 d.Mn in MnO4- e.S in S4O62- f.P in Na3PO4

Vinegar is a solution of acetic acid,CH3COOH,dissolved in water.A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH.What is the percent by weight of acetic acid in the vinegar?

Which one of the following is not a redox reaction?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Properties of Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Select the classification for the following reaction. 2NaCl(l) 2Na(l)+ Cl₂(g)

The oxidation numbers of P,S and Cl in H₂PO₂^-,H₂S and KClO₄ are,respectively

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products. a.BaCl₂(aq)+ Na₂SO₄(aq) $\to$ b.Mg(NO₃)₂(aq)+ KOH(aq) $\to$

Calculate the oxidation number of sulfur in sodium metabisulfite,Na₂S₂O₅.

Select the classification for the following reaction. KOH(aq)+ HCl(aq) $\to$ KCl(aq)+ H₂O(l)

Select the classification for the following reaction. CaCl₂·H₂O(s) CaCl₂(s)+ H₂O(g)

Predict the products by completing a balanced equation for the following decomposition reaction. CaCl₂(l) ?

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq)+ HBr(aq) $\to$ H₂O(l)+ LiBr(aq)

In both of the following reactions,a precipitate is formed.Complete and balance the equations,showing the phases of the products. a.AgNO₃(aq)+ CaCl₂(aq) $\to$ b.NaOH(aq)+ Fe(NO₃)₃(aq) $\to$

Automobile batteries use 3.0 M H₂SO₄ as an electrolyte.How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H₂SO₄(aq)+ 2NaOH(aq) $\to$ 2H₂O(l)+ Na₂SO₄(aq)

Select the classification for the following reaction. 2H₂O₂(aq) $\to$ 2H₂O(l)+ O₂(g)

In each of the following cases,write down the oxidation number of the indicated atom. a.P in P₄ b.C in C₂H₆ c.S in H₂SO₄ d.Mn in MnO₄^- e.S in S₄O₆^2- f.P in Na₃PO₄

Vinegar is a solution of acetic acid,CH₃COOH,dissolved in water.A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH.What is the percent by weight of acetic acid in the vinegar?