Molecular Geometry

The number of sigma and pi bonds in the carbon monoxide molecule (CO) is
1. 1; 1
2. 1; 2
3. 2; 2
4. 2; 1
The hybridization on the carbon atom in carbon monoxide (CO) is
1. sp
2. sp²
3. sp³
4. sp³d
For the H₂Te molecule, the molecular geometry is best described as
1. Trigonal pyramidal
2. Bent
3. See-saw
4. T-shaped
Pi bonds are
1. Hybridized s orbitals
2. Hybridized p orbitals
3. Unhybridized s orbitals
4. Unhybridized p orbitals
How many resonance structures are there for the SO₃ molecule?
1. 2
2. 3
3. 4
4. 5
The bond character for the HI molecule is best described as
1. Nonpolar covalent
2. Polar covalent
3. Ionic
Which of the following elements has the lowest electronegativity?
1. H
2. S
3. Cl
4. Ca
5. Ba
Which one of the following has nonpolar bonds?
1. H₂S
2. HCl
3. Br₂
4. OF₂
5. All are nonpolar
The Lewis dot structure for the nitrogen atom would contain __________ electron dots.
1. 1
2. 2
3. 3
4. 4
5. 5
Which one of the following has a double bond?
1. H₂O
2. C₂H₂
3. C₂H₄
4. CN^-
5. None of these
Of the following molecules, which do not obey the octet rule? BeCl₂; H₂O; PCl₃; XeBr₄
1. BeCl₂ and XeBr₄
2. XeBr₄ only
3. All obey the octet rule
4. None obey the octet rule
What is the formal charge on nitrogen in the nitrite ion, NO₂^-?
1. -1
2. 0
3. +1
4. +2
What is the bond angle with respect to nitrogen in the nitrite ion, NO₂^-?
1. ~180 degrees
2. ~120 degrees
3. ~109.5 degrees
4. ~90 degrees
What is the bond order between nitrogen and oxygen in the nitrite ion?
1. 1
2. 1 1/3
3. 1 1/2
4. 2
Which of the following is a correct description of the polarity with respect to the xenon dichloride molecule
1. It's polar with electrons drawn towards the chlorine atoms.
2. It's polar with electrons drawn towards the xenon atom.
3. It's nonpolar because it's linear.
4. It's nonpolar because Xe and Cl both have exactly the same electronegativity.
The enthalpy of formation (H_f) of rubidium bromide is -389kJ/mol. The enthalpy of sublimation for rubidium is 86kJ/mol, and the first ionization energy of rubidium is 402kJ/mol. The bond dissociation energy of Br_2(g) is 193kJ/mol and the electron affinity of bromine is -325kJ/mol. The enthalpy of vaporization of Br_2(l) is 31kJ/mol. Calculate the lattice energy of RbBr_(s) in kJ/mol.
1. -192
2. -983
3. +192
4. -2
5. -664
Which of the following would have the largest (most negative) lattice energy?
1. LiF
2. NaCl
3. KBr
4. KF
5. RbI
Which equation corresponds to the lattice energy for lithium fluoride?
1. Li_(s) + 1/2 F_2(g) LiF_(s)
2. Li⁺_(g) + F^-_(g) LiF_(g)
3. Li⁺_(aq) + F^-_(aq) LiF_(s)
4. Li⁺_(g) + F^-_(g) LiF_(s)
5. 2Li_(s) + F_2(g) 2LiF_(s)
Which equation corresponds to the heat of formation for lithium fluoride?
1. Li_(s) + 1/2 F_2(g) LiF_(s)
2. Li⁺_(g) + F^-_(g) LiF_(g)
3. Li⁺_(aq) + F^-_(aq) LiF_(s)
4. Li⁺_(g) + F^-_(g) LiF_(s)
5. 2Li_(s) + F_2(g) 2LiF_(s)
Which of the following moleucles contains polar bonds but is nonpolar?
1. CH₂Cl₂
2. CO₂
3. NH₃
4. H₂O
5. Cl₂
What is the proper order of decreasing Cl-Y-Cl angle? 1) PCl₃ 2) SiCl₄ 3) BCl₃
1. 1 > 2 > 3
2. 2 > 3 > 1
3. 3 > 2 > 1
4. 2 > 1 > 3
5. 3 > 1 > 2
Which of the following is most likely to form 2p³d² hybrids?
1. H
2. C
3. O
4. N
5. S
In the BrCN molecule, there are
1. 2 sigma and 1 pi bonds
2. 2 sigma and 2 pi bonds
3. 3 sigma and 1 pi bonds
4. 3 sigma and 2 pi bonds
5. 1 sigma and 3 pi bonds
Dilithium crystals are the fuel of the starship Enterprise ( of Star Trek fame). Based on molecular orbital theory, is this compound predicted to be stable (and if so, what is the bond order)?
1. Not stable, -1 bond order
2. Not stable, 0 bond order
3. Stable, 1 bond order
4. Stable, 2 bond order
5. Stable, 3 bond order
(Bonus) The measured dipole moment of HBr is 0.82D. If a H-Br bond is 141pm, what is the separated charge in HBr, in coulombs? (1 D = 3.34x10^-30 Cm). Remeber the dipole moment (in DeBye) is equal to the charge separation times the distance between the atoms.
1. 116
2. 34.6
3. 1.16x10^-18
4. 3.46x10^-19
5. 1.94x10^-20

Molecular Geometry

Quiz