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- 1. Multiple Choice
According to the VSEPR model, the progressive decrease in the bond angles in the series of molecules CH4, NH3, and H2O is best accounted for by the
increasing strength of the bonds
decreasing size of the central atom
increasing electronegativity of the central atom
increasing number of unshared pairs of electrons
decreasing repulsion between hydrogen atoms
- 2. Multiple Choice
Which of the following complete Lewis diagrams represents a molecule containing a bond
angle that is closest to 120o?
- 3. Multiple Choice
Contains 1 sigma (σ) and 2 pi (π) bonds
Li2
B2
N2
O2
F2
- 4. Multiple Choice
For which of the following molecules are resonance structures necessary to describe the bonding satisfactorily?
H2S
SO2
CO2
OF2
PF3
- 5. Multiple Choice
Has a trigonal-pyramidal molecular geometry
H2O
NH3
BH3
CH4
SiH4
- 6. Multiple Choice
Is predicted to have the largest bond angle
H2O
NH3
BH3
CH4
SiH4
- 7. Multiple Choice
Has molecules with a pyramidal shape
NH3
BH3
H2
H2S
HBr
- 8. Multiple Choice
Lewis electron-dot diagrams for CO2 and SO2 are given above. The molecular geometry and polarity of the two substances are
the same because the molecular formulas are similar
the same because C and S have similar electronegativity values
different because the lone pair of electrons on the S atom make it the negative end of a dipole
different because S has a greater number of electron domains (regions of electron density) surrounding it than C has
- 9. Multiple Choice
In the following diagrams, elements are represented by X and Z, which form molecular compounds with one another. Which diagram represents a molecule that has a bent molecular geometry?
- 10. Multiple Choice
Pi (π) bonding occurs in each of the following species EXCEPT
CO2
C2H4
CN-
C6H6
CH4
- 11. Multiple Choice
The BF3 molecule is nonpolar, whereas the NF3 molecule is polar. Which of the following statements accounts for the difference in polarity of the two molecules?
In NF3, each F is joined to N with multiple bonds, whereas in BF3 , each F is joined to B with single bonds.
N — F bonds are polar, whereas B — F bonds are nonpolar.
NF3 is an ionic compound, whereas BF3 is a molecular compound.
Unlike BF3, NF3 has a nonplanar geometry due to an unshared pair of electrons on the N atom.
- 12. Multiple Choice
In the reaction represented above, what is the hybridization of the C atoms before and after the reaction occurs?
Before sp after sp2
Before sp after sp3
Before sp2 after sp
Before sp2 after sp3
- 13. Multiple Choice
The geometry of the SO3 molecule is best described as
trigonal planar
trigonal pyramidal
square pyramidal
bent
- 14. Multiple Choice
The hybridization of the carbon atoms in the molecule represented above can be described as
sp
sp2
sp3
dsp3
- 15. Multiple Choice
The molecule that has trigonal pyramidal geometry
CO2
H2O
CH4
C2H4
PH3
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