Chemistry Concepts and Applications

Chapter 4: Formation of Compounds

Standardized Test Practice

1
The Lewis electron-dot structure of the bromide ion shows __________ valence electrons.

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A)one
B)four
C)seven
D)eight
2
What element is the only exception to the noble gas octet rule?

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A)helium
B)neon
C)argon
D)krypton
3
How many valence electrons are distributed among the three atoms when two hydrogen atoms react with one oxygen atom?

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A)5
B)6
C)7
D)8
4
Green plants take in this gas and give off oxygen during photosynthesis.
A)ammonia
B)carbon dioxide
C)hydrogen
D)nitrogen
5
Which pair will have the strongest attraction to one another?

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A)a lithium atom and a bromine atom
B)a lithium atom and a bromine ion
C)a lithium ion and a bromine atom
D)a lithium ion and a bromine ion
6
These interact when atoms react.
A)inner-level electrons
B)neutrons
C)only s-sublevel electrons
D)valence electrons
7
A chlorine atom attains an octet by __________.
A)gaining one electron
B)gaining three electrons
C)losing one electron
D)losing five electrons
8
A shared pair of electrons is called __________
A)a covalent bond
B)an ionic bond
C)an energy level
D)a compound
9
Gasoline and oil are covalent compounds that are __________ water.
A)heavier than
B)insoluble in
C)miscible with
D)soluble in
10
The covalent compound commonly found in plastic disposable lighters is __________.
A)butane
B)gasoline
C)water
D)carbon monoxide
11
Limestone, calcium carbonate, is a strong building material because of the ordered arrangement of __________ in its crystal structure.
A)atoms
B)covalent bonds
C)ions
D)molecules
12
When hydrogen and oxygen react to form water, __________.
A)energy is released
B)energy is absorbed
C)the reaction is endothermic
D)the mass increases
13
This is a metallic element that reacts violently with water.
A)copper
B)iron
C)silver
D)sodium
14
A mystery compound dissolves in water to produce a solution that does not conduct electricity. The compound cannot be __________.
A)benzene
B)butane
C)ethanol
D)sodium chloride
15
Nearly all the oxygen in the Earth's crust occurs in combinations with other elements called __________.

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A)ions
B)compounds
C)atoms
D)electrons
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