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Chemistry Ch.8 Review For Test
Test Description: Covalent bonding
Instructions: Answer all questions to get your test result.
1) Which is a typical characteristic of an ionic compound?
A
The ionic compound has a low solubility in water.
B
The ionic compound has a high melting point.
C
Electron pairs are shared among atoms.
D
The ionic compound is described as a molecule.
2) What is shown by the structural formula of a molecule or polyatomic ion?
A
the shapes of molecular orbitals
B
the number of metallic bonds
C
the arrangement of bonded atoms
D
the number of ionic bonds
3) Which of these elements does not exist as a diatomic molecule?
A
H
B
Ne
C
I
D
F
4) How do atoms achieve noble-gas electron configurations in single covalent bonds?
A
Two atoms share two pairs of electrons.
B
One atom completely loses two electrons to the other atom in the bond.
C
Two atoms share one electron.
D
Two atoms share two electrons.
5) Why do atoms share electrons in covalent bonds?
A
to become ions and attract each other
B
to attain a noble-gas electron configuration
C
to increase their atomic numbers
D
to become more polar
6) Which of the following elements can form diatomic molecules held together by triple covalent bonds?
A
oxygen
B
nitrogen
C
carbon
D
fluorine
7) Which noble gas has the same electron configuration as the oxygen in a water molecule?
A
helium
B
argon
C
xenon
D
neon
8) When one atom contributes both bonding electrons in a single covalent bond, the bond is called a(n) ___________.
A
one-sided covalent bond
B
coordinate covalent bond
C
ionic covalent bond
D
unequal covalent bond
9) According to the VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible?
A
pairs of valence electrons
B
the electrons closest to the nuclei
C
inner shell electrons
D
mobile electrons
10) What causes water molecules to have a bent shape, according to the VSEPR theory?
A
interaction between the fixed orbitals of the unshared pairs of oxygen
B
repulsive forces between unshared pairs of electrons
C
the unusual location of the free electrons
D
ionic attraction and repulsion
11) Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen?
A
S
B
Na
C
O
D
C
12) How many unshared pairs of electrons does the nitrogen atom in ammonia (NH3) possess?
A
4
B
2
C
3
D
1
13) Which of the following covalent bonds is most polar?
A
H--H
B
H--C
C
H--N
D
H--F
14) What is the correct name of S2O5?
A
sulfur oxide
B
disulfur pentoxide
C
pentasulfur dioxide
D
disulfide pentoxide
15) What is the correct name of NO3?
A
mononitrogen trioxide
B
none of the choices
C
nitrogen trioxide
D
nitride trioxide
16) What is the correct formula for triphosphorus pentoxide?
A
P2O3
B
P5O3
C
none of the choices
D
P3O5
17) What is the correct formula for boron dioxide?
A
B2O3
B
none of the choices
C
BO2
D
B2O
18) What is the total number of covalent bonds normally associated with a single carbon atom in a compound?
A
3
B
4
C
2
D
1
19) How many electrons does a nitrogen atom need to gain in order to attain a noble-gas electron configuration?
A
4
B
2
C
3
D
1
20) How many electrons are shared in a double covalent bond?
A
2
B
1
C
4
D
3
*select an answer for all questions
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