AnswersCA-Chemistry AThe History and Arrangement of the Periodic Table

The History and Arrangement of the Periodic Table — Unit test Answers

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1
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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.
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

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
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

What name should be used for the ionic compound KOH?

A
potassium oxide
B
potassium oxygen hydride
C
potassium hydroxide
D
potassium hydrogen oxide
6

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
7

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
8

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–.
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 molecular geometry is least likely to occur with sp3 hybridization?

A
tetrahedral
B
trigonal planar
C
bent
D
trigonal pyramidal
12

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
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

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

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

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