Answers26-27 CFISD TX-Chemistry A CRMolecular Geometry

Molecular Geometry — Unit test Answers

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Which molecular geometry is least likely to occur with sp3 hybridization?

A
tetrahedral
B
trigonal planar
C
bent
D
trigonal pyramidal
2
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What is the chemical formula for copper(II) sulfate?

A
CuSO
Option A
B
CuSO
Option B
C
CuS
D
CuS
Option D
3

Consider the Lewis dot structure for boron trifluoride (BF3).What is the molecular shape of BF3?

Question illustration
A
bent
B
tetrahedral
C
trigonal planar
D
trigonal pyramidal
4

Which statement best describes how to predict the formula of a stable ionic compound?

A
Use the same number of cations as anions so that the compound is neutral.
B
Use more cations than anions so that the compound is positively charged.
C
Use enough cations and anions so that the total charge is zero.
D
Use fewer cations than anions so that the compound is negatively charged.
5

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
6

In the Lewis dot structure for NH3, the central atom of the molecule has three atoms bonded to it and one lone pair of electrons.The shape of an NH3 molecule is

Question illustration
A
bent.
B
tetrahedral.
C
trigonal planar.
D
trigonal pyramidal.
7

Which is the IUPAC name of O3?

A
dioxide
B
oxygen
C
trioxygen
D
monoxide
8

What should the IUPAC name for a binary covalent compound lack?

A
prefixes
B
Roman numerals
C
an -ide ending
D
the name of a nonmetal
9

Which of the following could form an ionic bond with an anion?

A
Hg22+
B
NO2–
C
SO32–
D
Ar
10

What is the ratio of Fe ions to O ions in a neutral compound?

Question illustration
A
1:2
B
2:1
C
2:3
D
3:2
11

Which of the following do Lewis structures help us understand?

A
the exact structure of a molecule
B
the number of electrons that are involved in the bonding of the molecule
C
the total number of electrons in a molecule
D
how electrons attract other electrons in a molecule
12

What name should be used for the ionic compound KOH?

A
potassium oxide
B
potassium oxygen hydride
C
potassium hydroxide
D
potassium hydrogen oxide
13

Which is a general representation of a secondary amine?

A
An N is bonded to two electron dots above; with a dotted triangular line to an H, a solid triangular line to an H, and single line to an H; it is noted that the angle between the last 2 H atoms is 107 degrees.
Option A
B
An N with 2 electron dots is linked to an R 1 group with a single line, an H with a triangular line, and and H with a dotted line.
Option B
C
An N with 2 electron dots is linked to an R 1 group with a single line, an R 2 group with a triangular line, and and H with a dotted line.
Option C
D
An N with 2 electron dots is linked to an R 1 group with a single line, an R 2 group with a triangular line, and an R 3 with a dotted line.
Option D
14

Which is a property of covalent compounds?

A
They ionize in solution.
B
They tend to be very hard.
C
They have a low boiling point.
D
They have a high melting point.
15

If all of the bonding electrons in a molecule are bonded in two hybrid sp orbitals, which shape does the molecule most likely have?

A
linear
B
tetrahedral
C
trigonal planar
D
trigonal pyramidal

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