Question 1

Estimate the CO bond length in acetone, CH3COCH3.Given: covalent radii (pm)OfC-,77; C=,67; O-,74;O=,60; H,37.

Accepted Answer

A)  75.5 pm 
B)  127 pm 
C)  63.5 pm 
D)  151 pm 
E)  137 pm 
A)  75.5 pm 
B)  127 pm 
C)  63.5 pm 
D)  151 pm 
E)  137 pm

Question 2

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 3

In NO, the unpaired electron occupies what type of molecular orbital?

Accepted Answer

A)  3σ 
B)  4σ* 
C)  2π* 
D)  1π 
E)  The oxygen 2p orbital. 
A)  3σ 
B)  4σ* 
C)  2π* 
D)  1π 
E)  The oxygen 2p orbital.

Question 4

What is the shape of AlH4-?

Accepted Answer

A)  Tetrahedral 
B)  Trigonal bipyramidal 
C)  Seesaw 
D)  T-shaped 
E)  Square planar 
A)  Tetrahedral 
B)  Trigonal bipyramidal 
C)  Seesaw 
D)  T-shaped 
E)  Square planar

Question 5

If the following all crystallize in the same type of structure, which has the lowest lattice energy?

Accepted Answer

A)  LiCl 
B)  NaI 
C)  NaCl 
D)  KCl 
E)  KI 
A)  LiCl 
B)  NaI 
C)  NaCl 
D)  KCl 
E)  KI

Question 6

The bond order of N22+ is

Accepted Answer

A)  2.5. 
B)  1. 
C)  2. 
D)  1.5. 
E)  3. 
A)  2.5. 
B)  1. 
C)  2. 
D)  1.5. 
E)  3.

Question 7

What is the bond order in the OH radical?

Accepted Answer

The answer of What is the bond order in the...

Question 8

All the following are paramagnetic except

Accepted Answer

A)  O2+. 
B)  O2- 
C)  N22+.  
D)  N22- 
E)  O2.  
A)  O2+. 
B)  O2- 
C)  N22+.  
D)  N22- 
E)  O2.

Question 9

Draw the Lewis structure of xenon difluoride and give the number of lone pairs electrons around the central atom.

Accepted Answer

The answer of Draw the Lewis structure of xenon difluoride...

Question 10

Write all possible Lewis structures of sulfur dioxide. Which structure is most feasible?

Accepted Answer

The structure with t

Question 11

White phosphorus is composed of tetrahedral molecules of P4 in which each P atom is bonded to three others.In this molecule the formal charge on each P atom is ___.

Accepted Answer

Question 12

All of the following are polar except

Accepted Answer

A)  SF4.  
B)  ClO2- 
C)  IF4+. 
D)  XeF4.  
E)  ClF3. 
A)  SF4.  
B)  ClO2- 
C)  IF4+. 
D)  XeF4.  
E)  ClF3.

Question 13

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of sodium chloride ion-pairs,that is, the energy change for the following reaction:
Na+(g)+Cl-(g)$\rightarrow$ Na+Cl-(g)
Use r12 = 283 pm.

Accepted Answer

Question 14

Which of the following has bond angles of 180$\circ$?

Accepted Answer

A)  I3- 
B)  ClO2- 
C)  O3  
D)  NH2- 
E)  HO2- 
A)  I3- 
B)  ClO2- 
C)  O3  
D)  NH2- 
E)  HO2-

Question 15

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 16

An element, E,Has the electronic configuration [Ne] 3s23p1.Write the formula of its compound with sulfate.

Accepted Answer

Question 17

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

Accepted Answer

Question 18

Use the bond enthalpies given to estimate the heat released when 2-methyl-1-propene, (CH3)2C=CH2,
Reacts with HBr to give (CH3)2CBrCH3.Bond enthalpies ( kJ.mol-1 ):C-H,412; C-C,348;C=C,612; C-Br,276; H-Br,366.

Accepted Answer

A)  58 kJ.mol-1  
B)  507 kJ.mol-1  
C)  317  kJ.mol-1  
D)  288  kJ.mol-1  
E)  181  kJ.mol-1  
A)  58 kJ.mol-1  
B)  507 kJ.mol-1  
C)  317  kJ.mol-1  
D)  288  kJ.mol-1  
E)  181  kJ.mol-1

Question 19

If dinitrogen oxide has a dipole moment,
what is the arrangement of atoms?

Accepted Answer

The answer of If dinitrogen oxide has a dipole moment,
what...

Question 20

Which of the following has bond angles slightly less than 109$\circ$?

Accepted Answer

A)  NO2- 
B)  I3- 
C)  HOCl 
D)  O3  
E)  CH2- 
A)  NO2- 
B)  I3- 
C)  HOCl 
D)  O3  
E)  CH2-

Estimate the CO bond length in acetone, CH₃COCH₃.Given: covalent radii (pm)OfC-,77; C=,67; O-,74;O=,60; H,37.

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.

In NO, the unpaired electron occupies what type of molecular orbital?

What is the shape of AlH₄^-?

If the following all crystallize in the same type of structure, which has the lowest lattice energy?

The bond order of N₂²⁺ is

What is the bond order in the OH radical?

All the following are paramagnetic except

Draw the Lewis structure of xenon difluoride and give the number of lone pairs electrons around the central atom.

Write all possible Lewis structures of sulfur dioxide. Which structure is most feasible?

White phosphorus is composed of tetrahedral molecules of P₄ in which each P atom is bonded to three others.In this molecule the formal charge on each P atom is ___.

All of the following are polar except

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of sodium chloride ion-pairs,that is, the energy change for the following reaction: Na⁺(g)+Cl^-(g) $\rightarrow$ Na⁺Cl^-(g) Use r₁₂ = 283 pm.

Which of the following has bond angles of 180^$\circ$?

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

An element, E,Has the electronic configuration [Ne] 3s²3p¹.Write the formula of its compound with sulfate.

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

Use the bond enthalpies given to estimate the heat released when 2-methyl-1-propene, (CH₃)₂C=CH₂, Reacts with HBr to give (CH₃)₂CBrCH₃.Bond enthalpies ( kJ.mol^-1):C-H,412; C-C,348;C=C,612; C-Br,276; H-Br,366.

If dinitrogen oxide has a dipole moment, what is the arrangement of atoms?

Which of the following has bond angles slightly less than 109^$\circ$?

Atoms

States of Matter

Thermodynamics

Equilibrium

Reactions

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

Exam 2: Molecules

Estimate the CO bond length in acetone, CH3COCH3.Given: covalent radii (pm)OfC-,77; C=,67; O-,74;O=,60; H,37.

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.

In NO, the unpaired electron occupies what type of molecular orbital?

What is the shape of AlH4-?

If the following all crystallize in the same type of structure, which has the lowest lattice energy?

The bond order of N22+ is

What is the bond order in the OH radical?

All the following are paramagnetic except

Draw the Lewis structure of xenon difluoride and give the number of lone pairs electrons around the central atom.

Write all possible Lewis structures of sulfur dioxide. Which structure is most feasible?

White phosphorus is composed of tetrahedral molecules of P4 in which each P atom is bonded to three others.In this molecule the formal charge on each P atom is ___.

All of the following are polar except

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of sodium chloride ion-pairs,that is, the energy change for the following reaction: Na+(g)+Cl-(g) →\rightarrow→ Na+Cl-(g) Use r12 = 283 pm.

Which of the following has bond angles of 180 ∘\circ∘ ?

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

An element, E,Has the electronic configuration [Ne] 3s23p1.Write the formula of its compound with sulfate.

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

Use the bond enthalpies given to estimate the heat released when 2-methyl-1-propene, (CH3)2C=CH2, Reacts with HBr to give (CH3)2CBrCH3.Bond enthalpies ( kJ.mol-1 ):C-H,412; C-C,348;C=C,612; C-Br,276; H-Br,366.

If dinitrogen oxide has a dipole moment, what is the arrangement of atoms?

Which of the following has bond angles slightly less than 109 ∘\circ∘ ?

Atoms

States of Matter

Thermodynamics

Equilibrium

Reactions

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

Estimate the CO bond length in acetone, CH₃COCH₃.Given: covalent radii (pm)OfC-,77; C=,67; O-,74;O=,60; H,37.

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.

What is the shape of AlH₄^-?

The bond order of N₂²⁺ is

White phosphorus is composed of tetrahedral molecules of P₄ in which each P atom is bonded to three others.In this molecule the formal charge on each P atom is ___.

Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of sodium chloride ion-pairs,that is, the energy change for the following reaction: Na⁺(g)+Cl^-(g) $\rightarrow$ Na⁺Cl^-(g) Use r₁₂ = 283 pm.

Which of the following has bond angles of 180^$\circ$?

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

An element, E,Has the electronic configuration [Ne] 3s²3p¹.Write the formula of its compound with sulfate.

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

Use the bond enthalpies given to estimate the heat released when 2-methyl-1-propene, (CH₃)₂C=CH₂, Reacts with HBr to give (CH₃)₂CBrCH₃.Bond enthalpies ( kJ.mol^-1):C-H,412; C-C,348;C=C,612; C-Br,276; H-Br,366.

Which of the following has bond angles slightly less than 109^$\circ$?