Answers26-27 CFISD TX-Chemistry A CRMolecular Geometry

Molecular Geometry — Unit test Answers

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1
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Which element has the lowest ionization energy?

Question illustration
A
argon (Ar)
B
bromine (Br)
C
cesium (Cs)
D
nickel (Ni)
2
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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
3

Which is the IUPAC name of O3?

A
dioxide
B
oxygen
C
trioxygen
D
monoxide
4

A substance conducts an electric current when it is in the liquid state. What would the conductivity of the substance in solid form indicate about the type of bond in the substance?

A
If the solid is conductive, the bonds are ionic.
B
If the solid is not conductive, the bonds are covalent.
C
If the solid is conductive, the bonds are metallic.
D
If the solid is not conductive, the bonds are metallic.
5

What is the chemical formula for copper(II) sulfate?

A
CuSO
Option A
B
CuSO
Option B
C
CuS
D
CuS
Option D
6

Geckos and water striders rely on forces between molecules. Which statement best identifies the forces involved?

A
Geckos use covalent bonds to stick to glass.
B
The type of force that water striders use is stronger than the type of force that geckos use.
C
Water striders use London dispersion forces to walk on water.
D
The type of force that geckos use is attractive, and the type of force that water striders use is repulsive.
7

Which statement describes the valence electrons in metallic bonds?

A
They are shared equally between two atoms.
B
They are shared unequally between two atoms.
C
They are shared among many atoms.
D
They are transferred from one atom to another.
8

What name should be used for the ionic compound KOH?

A
potassium oxide
B
potassium oxygen hydride
C
potassium hydroxide
D
potassium hydrogen oxide
9

The IUPAC name for NF3 should have which of the following?

A
the prefix “tri” before nitrogen
B
the Roman numeral (III) after nitrogen
C
the Roman numeral (III) after fluoride
D
the prefix “tri” before fluoride
10

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
11

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.
12

Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

A
ionic bonding
B
metallic bonding
C
covalent bonding
D
hydrogen bonding
13

Which statement about hydrogen bonds is true?

A
They are the only force that allows a gecko to climb up glass.
B
They are the weakest of the intermolecular forces.
C
They are much stronger than intramolecular forces.
D
They help water striders walk on water by creating surface tension.
14

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.
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
16

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
17

Based on its location in the periodic table, what can most likely be predicted about sulfur?

A
It has four valence electrons available for bonding.
B
It has four nonbonding electrons.
C
It has six valence electrons available for bonding.
D
It has six nonbonding electrons.
18

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

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