Answers26-27 CFISD TX-Chemistry A CRIntermolecular Forces

Intermolecular Forces — Unit test Answers

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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.
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

A plate of the steel hull of a ship develops a large crack when the ship strikes a reef. Analysis of the steel’s composition shows higher-than-normal levels of an element that could explain why the plate cracked instead of bending. Which element is most likely suspected?

A
iron
B
sulfur
C
chromium
D
nickel
4

What name should be used for the ionic compound KOH?

A
potassium oxide
B
potassium oxygen hydride
C
potassium hydroxide
D
potassium hydrogen oxide
5

What does it mean that valence electrons in a metal are delocalized?

A
The valence electrons move between atoms in shared orbitals.
B
The valence electrons move from outer orbitals to inner orbitals of each atom.
C
The valence electrons move from inner orbitals to outer orbitals of each atom.
D
The valence electrons move out of the orbitals and go into the air.
6

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.
7

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
8

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

A
CuSO
Option A
B
CuSO
Option B
C
CuS
D
CuS
Option D
9

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
10

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.
11

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
12

Which statement describes the electron sea model for metallic bonding?

A
This model involves electrons held tightly between atoms.
B
This model explains all properties of metals.
C
This model involves electrons moving among bands of orbitals.
D
This model is the simplest model.
13

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.
14

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
15

Which reason best explains why metals are malleable?

A
because they have delocalized electrons
B
because they have localized electrons
C
because they have ionic bonds
D
because they have rigid bonds
16

What is a three-dimensional structure that represents the alternating pattern of particles in a crystal?

A
a polyatomic ion
B
a crystal lattice
C
a covalent bond
D
a formula unit
17

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
18

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.
19

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.
20

Which best describes why NH4+ can form an ionic bond with Cl–?

A
Its outermost shell gains one or more electrons from Cl–.
B
Its positive charge is attracted to the negative charge of Cl–.
C
It has a negative charge that is spread over the entire ion.
D
It has a nitrogen atom that is strongly attracted to Cl–.

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