Answers26-27 CFISD TX-Chemistry A CRNomenclature of Covalent Compounds

Molecular Geometry Answers

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Two molecules have the same molecular geometry but different electron domain geometries. Which combination of atoms and lone pairs around the central atom could describe these molecules?

A
2 atoms and 2 lone pairs; 3 atoms and 0 lone pairs
B
1 atom and 3 lone pairs; 2 atoms and 1 lone pair
C
3 atoms and 1 lone pair; 3 atoms and 0 lone pairs
D
2 atoms and 2 lone pairs; 2 atoms and 1 lone pair
2
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By examining electron domain geometry, one can determine that the ammonia molecule (NH3) has

A
one sp2 orbital.
B
two sp2 orbitals.
C
three sp3 orbitals.
D
four sp3 orbitals.
5

What is the molecular shape of HCN?

A
bent
B
linear
C
angular
D
trigonal pyramidal
7

Which molecule has a trigonal planar shape?

A
carbon monoxide
B
boron trichloride
C
silicon tetraiodide
D
carbon tetrafluoride
11

Which best compares a molecule that has a trigonal planar shape with one that has a trigonal pyramidal shape?

A
They both contain three lone pairs of electrons around the central atom.
B
They both contain three atoms around the central atom.
C
The central atom of the trigonal planar molecule has two lone pairs around it, but the central atom of the trigonal pyramidal molecule has only one.
D
The central atom of the trigonal planar molecule has two atoms around it, but the central atom of the trigonal pyramidal molecule has only one.
13

If a molecule has four hybrid sp3 orbitals, it can be concluded that the molecule has a

A
trigonal planar molecular geometry.
B
trigonal planar electron domain geometry.
C
tetrahedral molecular geometry.
D
tetrahedral electron domain geometry.

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