AnswersIA-Chemistry A Survey of Chemistry AUnit Test

Unit Test — Unit test Answers

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

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A
1:2
B
2:1
C
2:3
D
3:2
2
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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.
3

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.
4

Which compound most likely contains polar covalent bonds?

A
NaCl
B
AlF3
C
Br2
D
NF3
5

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
6

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
7

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

A
Hg22+
B
NO2–
C
SO32–
D
Ar
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

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
10

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

A
CuSO
Option A
B
CuSO
Option B
C
CuS
D
CuS
Option D
11

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.
12

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–.
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 describes a step in the process of forming an ionic bond?

A
A metal atom loses electrons and becomes a positive ion.
B
A metal atom gains electrons and becomes a negative ion.
C
A nonmetal atom loses electrons and becomes a negative ion.
D
A nonmetal atom gains electrons and becomes a positive ion.
15

Which is the IUPAC name of O3?

A
dioxide
B
oxygen
C
trioxygen
D
monoxide

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