Question 1

For each of the following species except ____,the electronic structure may be adequately described by two resonance formulas.

Accepted Answer

A) O3 
B) SO32- 
C) NO2- 
D) C6H6 
E) SO2 
A) O3 
B) SO32- 
C) NO2- 
D) C6H6 
E) SO2

Question 2

How many valence electrons does a carbonate ion have?

Accepted Answer

A) 30 
B) 28 
C) 24 
D) 32 
E) 22 
A) 30 
B) 28 
C) 24 
D) 32 
E) 22

Question 3

Which of the following Lewis formulas is incorrect?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 4

Based on the following data,what is the I-I bond energy?   H2(g)+  
I2(g)→ HI(g); ΔH = 26.36 kJ
Bond
Bond Energy (kJ/mol)
H-H
435
H-I
295

Accepted Answer

A) 365 kJ/mol 
B) 208 kJ/mol 
C) -208 kJ/mol 
D) -155 kJ/mol 
E) 155 kJ/mol 
A) 365 kJ/mol 
B) 208 kJ/mol 
C) -208 kJ/mol 
D) -155 kJ/mol 
E) 155 kJ/mol

Question 5

The total number of valence electrons in the phosphate ion is

Accepted Answer

A) 32. 
B) 30. 
C) 24. 
D) 28. 
E) 26. 
A) 32. 
B) 30. 
C) 24. 
D) 28. 
E) 26.

Question 6

Rank the following ions in order of decreasing atomic radii: Te2-,Te4+,Te6+.

Accepted Answer

A) Te2- > Te4+ > Te6+ 
B) Te6+ > Te4+ > Te2- 
C) Te4+ > Te2- > Te6+ 
D) Te2- > Te6+ > Te4+ 
E) Te4+ > Te6+ > Te2- 
A) Te2- > Te4+ > Te6+ 
B) Te6+ > Te4+ > Te2- 
C) Te4+ > Te2- > Te6+ 
D) Te2- > Te6+ > Te4+ 
E) Te4+ > Te6+ > Te2-

Question 7

Which of the following processes is not exothermic?

Accepted Answer

A) Rb+(g)+ e- → Rb(g) 
B) ​Rb+(g)+ Cl-(g)→ RbCl(s) 
C) ​Cl(g)+ e- → Cl-(g) 
D) ​Rb(g)→ Rb(s) 
E) ​   Cl2(g)→ Cl(g) 
A) Rb+(g)+ e- → Rb(g) 
B) ​Rb+(g)+ Cl-(g)→ RbCl(s) 
C) ​Cl(g)+ e- → Cl-(g) 
D) ​Rb(g)→ Rb(s) 
E) ​   Cl2(g)→ Cl(g)

Question 8

Using bond-energy data,what is ΔH° for the following reaction?
CH3OH(g)+ H2S(g)→ CH3SH(g)+ H2O(g)
Bond
Bond Energy (kJ/mol)
C-H
413
C-O
358
O-H
463
C-S
259
S-H
339

Accepted Answer

A) -25 kJ 
B) -124 kJ 
C) 25 kJ 
D) -2763 kJ 
E) 2738 kJ 
A) -25 kJ 
B) -124 kJ 
C) 25 kJ 
D) -2763 kJ 
E) 2738 kJ

Question 9

Which of the following is a correct Lewis electron-dot formula for CO?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 10

How many valence electrons are there in the trifluoroacetate ion,CF3COO-?

Accepted Answer

A) 41 
B) 42 
C) 54 
D) 56 
E) 40 
A) 41 
B) 42 
C) 54 
D) 56 
E) 40

Question 11

The number of valence electrons in the propionate ion,CH3CH2COO-,is

Accepted Answer

A) 30. 
B) 32. 
C) 36. 
D) 50. 
E) 28. 
A) 30. 
B) 32. 
C) 36. 
D) 50. 
E) 28.

Question 12

What is the total number of valence electrons in N2O?

Accepted Answer

A) 16 
B) 17 
C) 34 
D) 11 
E) 22 
A) 16 
B) 17 
C) 34 
D) 11 
E) 22

Question 13

What is the ground-state electron configuration of Co3+?

Accepted Answer

A) [Ar]3d5 
B) [Ar]3d44s2 
C) [Ar]3d6 
D) [Ar]3d64s1 
E) [Ar]3d54s2 
A) [Ar]3d5 
B) [Ar]3d44s2 
C) [Ar]3d6 
D) [Ar]3d64s1 
E) [Ar]3d54s2

Question 14

Which one of the following has an enthalpy change that is equal to the lattice energy of SrClS1U1B12S1U1B0?

Accepted Answer

A) SrClS1U1B12S1U1B0(s)? Sr(g)+ 2Cl(g) 
B) SrClS1U1B12S1U1B0(s)? Sr(g)+ ClS1U1B12S1U1B0(g) 
C) SrClS1U1B12S1U1B0(s)? SrS1U1P12+S1S1P0(g)+ 2Cl(g) 
D) SrClS1U1B12S1U1B0(s)? Sr(s)+ ClS1U1B12S1U1B0(g) 
E) SrClS1U1B12S1U1B0(s)? SrS1U1P12+S1S1P0(g)+ 2ClS1U1P1-S1S1P0(g) 
A) SrClS1U1B12S1U1B0(s)? Sr(g)+ 2Cl(g) 
B) SrClS1U1B12S1U1B0(s)? Sr(g)+ ClS1U1B12S1U1B0(g) 
C) SrClS1U1B12S1U1B0(s)? SrS1U1P12+S1S1P0(g)+ 2Cl(g) 
D) SrClS1U1B12S1U1B0(s)? Sr(s)+ ClS1U1B12S1U1B0(g) 
E) SrClS1U1B12S1U1B0(s)? SrS1U1P12+S1S1P0(g)+ 2ClS1U1P1-S1S1P0(g)

Question 15

Which of the following statements is true?

Accepted Answer

A) The triple bond in N2 has a smaller bond order and a smaller bond length than the single bond in F2. 
B) The triple bond in N2 has a larger bond order and a smaller bond length than the single bond in F2. 
C) The triple bond in N2 has a smaller bond order and a larger bond length than the single bond in F2. 
D) The triple bond in N2 has a larger bond order and a larger bond length than the single bond in F2. 
E) The triple bond in N2 and the single bond in F2 have the same bond order and the same bond length. 
A) The triple bond in N2 has a smaller bond order and a smaller bond length than the single bond in F2. 
B) The triple bond in N2 has a larger bond order and a smaller bond length than the single bond in F2. 
C) The triple bond in N2 has a smaller bond order and a larger bond length than the single bond in F2. 
D) The triple bond in N2 has a larger bond order and a larger bond length than the single bond in F2. 
E) The triple bond in N2 and the single bond in F2 have the same bond order and the same bond length.

Question 16

Which of the following Lewis structures best describes BF3?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 17

All of the following species are isoelectronic except

Accepted Answer

A) S2- 
B) K+ 
C) Na+ 
D) Ar 
E) Cl- 
A) S2- 
B) K+ 
C) Na+ 
D) Ar 
E) Cl-

Question 18

In which of the following species is the octet rule violated by the central atom when the central atom has a formal charge of zero?

Accepted Answer

A) SOCl2 
B) CCl4 
C) H2S 
D) PF3 
E) N2F4 
A) SOCl2 
B) CCl4 
C) H2S 
D) PF3 
E) N2F4

Question 19

Which of the following is a correct description of lattice energy?

Accepted Answer

A) The energy change that occurs when electrons are removed from a lattice. 
B) The energy change that occurs when a gas condenses to a liquid. 
C) The energy change that occurs when a liquid freezes. 
D) The energy change that occurs when an ionic solid is separated into its ions in the gas phase. 
E) The lattice energy of a substance is identical to the ionic bond energy determined from coulombs law. 
A) The energy change that occurs when electrons are removed from a lattice. 
B) The energy change that occurs when a gas condenses to a liquid. 
C) The energy change that occurs when a liquid freezes. 
D) The energy change that occurs when an ionic solid is separated into its ions in the gas phase. 
E) The lattice energy of a substance is identical to the ionic bond energy determined from coulombs law.

Question 20

All of the following have ground-state noble-gas electron configurations except

Accepted Answer

A) Ar 
B) N3- 
C) P3+ 
D) Mg2+ 
E) Cl- 
A) Ar 
B) N3- 
C) P3+ 
D) Mg2+ 
E) Cl-

Exam 9: Ionic and Covalent Bonding

For each of the following species except ____,the electronic structure may be adequately described by two resonance formulas.

How many valence electrons does a carbonate ion have?

Which of the following Lewis formulas is incorrect?

Based on the following data,what is the I-I bond energy? H2(g)+ I2(g)→ HI(g); ΔH = 26.36 kJ Bond Bond Energy (kJ/mol) H-H 435 H-I 295

The total number of valence electrons in the phosphate ion is

Rank the following ions in order of decreasing atomic radii: Te2-,Te4+,Te6+.

Which of the following processes is not exothermic?

Using bond-energy data,what is ΔH° for the following reaction? CH3OH(g)+ H2S(g)→ CH3SH(g)+ H2O(g) Bond Bond Energy (kJ/mol) C-H 413 C-O 358 O-H 463 C-S 259 S-H 339

Which of the following is a correct Lewis electron-dot formula for CO?

How many valence electrons are there in the trifluoroacetate ion,CF3COO-?

The number of valence electrons in the propionate ion,CH3CH2COO-,is

What is the total number of valence electrons in N2O?

What is the ground-state electron configuration of Co3+?

Which one of the following has an enthalpy change that is equal to the lattice energy of SrCl2?

Which of the following statements is true?

Which of the following Lewis structures best describes BF3?

All of the following species are isoelectronic except

In which of the following species is the octet rule violated by the central atom when the central atom has a formal charge of zero?

Which of the following is a correct description of lattice energy?

All of the following have ground-state noble-gas electron configurations except

Chemistry and Measurement

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The Gaseous State

Thermochemistry

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Acid-Base Equilibria

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Filters

Based on the following data,what is the I-I bond energy? H₂(g)+ I₂(g)→ HI(g); ΔH = 26.36 kJ Bond Bond Energy (kJ/mol) H-H 435 H-I 295

Rank the following ions in order of decreasing atomic radii: Te^2-,Te⁴⁺,Te⁶⁺.

Using bond-energy data,what is ΔH° for the following reaction? CH₃OH(g)+ H₂S(g)→ CH₃SH(g)+ H₂O(g) Bond Bond Energy (kJ/mol) C-H 413 C-O 358 O-H 463 C-S 259 S-H 339

How many valence electrons are there in the trifluoroacetate ion,CF₃COO^-?

The number of valence electrons in the propionate ion,CH₃CH₂COO^-,is

What is the total number of valence electrons in N₂O?

What is the ground-state electron configuration of Co³⁺?

Which one of the following has an enthalpy change that is equal to the lattice energy of SrCl₂?

Which of the following Lewis structures best describes BF₃?