Question 1

How many double bonds are present in the "best" resonance structure of the phosphate ion?

Accepted Answer

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

Question 2

What is the formal charge of S in the molecule H2SO4?

Accepted Answer

Question 3

How many electrons are in the expanded valence in I3-?

Accepted Answer

A) 12 
B) 6 
C) 10 
D) 14 
E) 8 
A) 12 
B) 6 
C) 10 
D) 14 
E) 8

Question 4

The best Lewis structures of SO2 and O3 include expanded valence structures such as O=S=O and O=O=O.

Accepted Answer

A) True 
 B)False

Question 5

Which of the compounds below has bonds with the least covalent character?

Accepted Answer

A) AgI 
B) AgCl 
C) AgF 
D) AlCl3  
E) BeCl2  
A) AgI 
B) AgCl 
C) AgF 
D) AlCl3  
E) BeCl2

Question 6

Which of the following compounds contains the weakest bonds to hydrogen?

Accepted Answer

A) CH4  
B) H2O 
C) SiH4  
D) HF 
E) H2S 
A) CH4  
B) H2O 
C) SiH4  
D) HF 
E) H2S

Question 7

Which has the greater ionic character: H2S or H2O?

Accepted Answer

Question 8

The electronegativity of an element can be expressed as ½(I + Ea)where I is the ionization energy and Ea is the electron affinity.

Accepted Answer

A) True 
 B)False

Question 9

Use the bond enthalpies given to estimate the heat released when ethene,CH2=CH2,reacts with HBr to give CH3CH2Br.Bond enthalpies (kJ.mol-1): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193; H-Br,366.

Accepted Answer

A) 1036 kJ.mol-1 
B) 200 kJ.mol-1 
C) 470 kJ.mol-1 
D) 424 kJ.mol-1 
E) 58 kJ.mol-1 
A) 1036 kJ.mol-1 
B) 200 kJ.mol-1 
C) 470 kJ.mol-1 
D) 424 kJ.mol-1 
E) 58 kJ.mol-1

Question 10

How many electrons are in the expanded valence in H2SO4?

Accepted Answer

A) 12 
B) 14 
C) 8 
D) 6 
E) 10 
A) 12 
B) 14 
C) 8 
D) 6 
E) 10

Question 11

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of rubidium chloride ion-pairs,that is,the energy change for the following reaction:
Rb+(g)+ Cl-(g)$\rightarrow$Rb+Cl-(g)
Use r12 = 330 pm.

Accepted Answer

-421 kJ.mo

Question 12

How many lone pairs of electrons are found in the Lewis structure of hydrazine,H2NNH2?

Accepted Answer

A) 8 
B) 4 
C) 1 
D) 0 
E) 2 
A) 8 
B) 4 
C) 1 
D) 0 
E) 2

Question 13

In the "best" Lewis structure of XeO4,there are two double bonds and the formal charge on Xe is zero.

Accepted Answer

A) True 
 B)False

Question 14

Use the bond enthalpies given to estimate the heat released when 1-bromobutene,CH3CH2CH=CH2,reacts with bromine to give CH3CH2CHBrCH2Br.Bond enthalpies (kJ.mol-1): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193.

Accepted Answer

A) 181 kJ.mol-1  
B) 317 kJ.mol-1  
C) 288 kJ.mol-1  
D) 95 kJ.mol-1  
E) 507 kJ.mol-1  
A) 181 kJ.mol-1  
B) 317 kJ.mol-1  
C) 288 kJ.mol-1  
D) 95 kJ.mol-1  
E) 507 kJ.mol-1

Question 15

Which of the following species are radicals?
A)CH2O
B)HCN
C)HclO
D)ClONO2 
E)ClO

Accepted Answer

Question 16

Which of the compounds below has bonds with the most covalent character?

Accepted Answer

A) NaCl 
B) LiCl 
C) CaCl2  
D) BeCl2  
E) MgCl2  
A) NaCl 
B) LiCl 
C) CaCl2  
D) BeCl2  
E) MgCl2

Question 17

Because of the octet rule,the gaseous O2- ion is stable.

Accepted Answer

A) True 
 B)False

Question 18

Draw the "best" Lewis structures of hydrogen azide,HN1N2N3,and the azide ion,N1N2N3- .The subscripts are used for identification.For each,match the following bond lengths to the correct N-N bond.The bond lengths can be used more than once.

Accepted Answer

hydrogen azide: N₁-

Question 19

Which of the following species has bonds with the most ionic character?

Accepted Answer

A) CO2  
B) NO2  
C) SnO2  
D) P4O10  
E) PCl3  
A) CO2  
B) NO2  
C) SnO2  
D) P4O10  
E) PCl3

Question 20

Which of the following do not have resonance structures?

Accepted Answer

A) CH3CONH- 
B) CH2COCH3- 
C) H2CO 
D) All have resonance structures. 
A) CH3CONH- 
B) CH2COCH3- 
C) H2CO 
D) All have resonance structures.

How many double bonds are present in the "best" resonance structure of the phosphate ion?

What is the formal charge of S in the molecule H₂SO₄?

How many electrons are in the expanded valence in I₃^-?

The best Lewis structures of SO₂ and O₃ include expanded valence structures such as O=S=O and O=O=O.

Which of the compounds below has bonds with the least covalent character?

Which of the following compounds contains the weakest bonds to hydrogen?

Which has the greater ionic character: H₂S or H₂O?

The electronegativity of an element can be expressed as ½(I + E_a)where I is the ionization energy and E_a is the electron affinity.

Use the bond enthalpies given to estimate the heat released when ethene,CH₂=CH₂,reacts with HBr to give CH₃CH₂Br.Bond enthalpies (kJ.mol^-¹): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193; H-Br,366.

How many electrons are in the expanded valence in H₂SO₄?

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of rubidium chloride ion-pairs,that is,the energy change for the following reaction: Rb⁺(g)+ Cl^-(g) $\rightarrow$ Rb⁺Cl^-(g) Use r₁₂ = 330 pm.

How many lone pairs of electrons are found in the Lewis structure of hydrazine,H₂NNH₂?

In the "best" Lewis structure of XeO₄,there are two double bonds and the formal charge on Xe is zero.

Use the bond enthalpies given to estimate the heat released when 1-bromobutene,CH₃CH₂CH=CH₂,reacts with bromine to give CH₃CH₂CHBrCH₂Br.Bond enthalpies (kJ.mol^-¹): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193.

Which of the following species are radicals? A)CH₂O B)HCN C)HclO D)ClONO₂ E)ClO

Which of the compounds below has bonds with the most covalent character?

Because of the octet rule,the gaseous O²^- ion is stable.

Draw the "best" Lewis structures of hydrogen azide,HN₁N₂N₃,and the azide ion,N₁N₂N₃^- .The subscripts are used for identification.For each,match the following bond lengths to the correct N-N bond.The bond lengths can be used more than once.

Which of the following species has bonds with the most ionic character?

Which of the following do not have resonance structures?

The Quantum World

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Molecular Shape and Structure

The Properties of Gases

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Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

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Exam 3: Chemical Bonds

How many double bonds are present in the "best" resonance structure of the phosphate ion?

What is the formal charge of S in the molecule H2SO4?

How many electrons are in the expanded valence in I3-?

The best Lewis structures of SO2 and O3 include expanded valence structures such as O=S=O and O=O=O.

Which of the compounds below has bonds with the least covalent character?

Which of the following compounds contains the weakest bonds to hydrogen?

Which has the greater ionic character: H2S or H2O?

The electronegativity of an element can be expressed as ½(I + Ea)where I is the ionization energy and Ea is the electron affinity.

Use the bond enthalpies given to estimate the heat released when ethene,CH2=CH2,reacts with HBr to give CH3CH2Br.Bond enthalpies (kJ.mol-1): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193; H-Br,366.

How many electrons are in the expanded valence in H2SO4?

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of rubidium chloride ion-pairs,that is,the energy change for the following reaction: Rb+(g)+ Cl-(g) →\rightarrow→ Rb+Cl-(g) Use r12 = 330 pm.

How many lone pairs of electrons are found in the Lewis structure of hydrazine,H2NNH2?

In the "best" Lewis structure of XeO4,there are two double bonds and the formal charge on Xe is zero.

Use the bond enthalpies given to estimate the heat released when 1-bromobutene,CH3CH2CH=CH2,reacts with bromine to give CH3CH2CHBrCH2Br.Bond enthalpies (kJ.mol-1): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193.

Which of the following species are radicals? A)CH2O B)HCN C)HclO D)ClONO2 E)ClO

Which of the compounds below has bonds with the most covalent character?

Because of the octet rule,the gaseous O2- ion is stable.

Draw the "best" Lewis structures of hydrogen azide,HN1N2N3,and the azide ion,N1N2N3- .The subscripts are used for identification.For each,match the following bond lengths to the correct N-N bond.The bond lengths can be used more than once.

Which of the following species has bonds with the most ionic character?

Which of the following do not have resonance structures?

The Quantum World

Quantum Mechanics in Action: Atoms

Molecular Shape and Structure

The Properties of Gases

Liquids and Solids

Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: The D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

Filters

What is the formal charge of S in the molecule H₂SO₄?

How many electrons are in the expanded valence in I₃^-?

The best Lewis structures of SO₂ and O₃ include expanded valence structures such as O=S=O and O=O=O.

Which has the greater ionic character: H₂S or H₂O?

The electronegativity of an element can be expressed as ½(I + E_a)where I is the ionization energy and E_a is the electron affinity.

Use the bond enthalpies given to estimate the heat released when ethene,CH₂=CH₂,reacts with HBr to give CH₃CH₂Br.Bond enthalpies (kJ.mol^-¹): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193; H-Br,366.

How many electrons are in the expanded valence in H₂SO₄?

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of rubidium chloride ion-pairs,that is,the energy change for the following reaction: Rb⁺(g)+ Cl^-(g) $\rightarrow$ Rb⁺Cl^-(g) Use r₁₂ = 330 pm.

How many lone pairs of electrons are found in the Lewis structure of hydrazine,H₂NNH₂?

In the "best" Lewis structure of XeO₄,there are two double bonds and the formal charge on Xe is zero.

Use the bond enthalpies given to estimate the heat released when 1-bromobutene,CH₃CH₂CH=CH₂,reacts with bromine to give CH₃CH₂CHBrCH₂Br.Bond enthalpies (kJ.mol^-¹): C-H,412; C-C,348; C=C,612; C-Br,276; Br-Br,193.

Which of the following species are radicals? A)CH₂O B)HCN C)HclO D)ClONO₂ E)ClO

Because of the octet rule,the gaseous O²^- ion is stable.

Draw the "best" Lewis structures of hydrogen azide,HN₁N₂N₃,and the azide ion,N₁N₂N₃^- .The subscripts are used for identification.For each,match the following bond lengths to the correct N-N bond.The bond lengths can be used more than once.