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