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