Chemistry Ch.8 Review For Test Question Preview (ID: 23299)
Covalent Bonding.
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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.
What is shown by the structural formula of a molecule or polyatomic ion?
a) the arrangement of bonded atoms
b) the number of ionic bonds
c) the number of metallic bonds
d) the shapes of molecular orbitals
Which of these elements does not exist as a diatomic molecule?
a) Ne
b) F
c) H
d) I
How do atoms achieve noble-gas electron configurations in single covalent bonds?
a) One atom completely loses two electrons to the other atom in the bond.
b) Two atoms share two pairs of electrons.
c) Two atoms share two electrons.
d) Two atoms share one electron.
Why do atoms share electrons in covalent bonds?
a) to become ions and attract each other
b) to become more polar
c) to attain a noble-gas electron configuration
d) to increase their atomic numbers
Which of the following elements can form diatomic molecules held together by triple covalent bonds?
a) carbon
b) oxygen
c) nitrogen
d) fluorine
Which noble gas has the same electron configuration as the oxygen in a water molecule?
a) helium
b) neon
c) argon
d) xenon
When one atom contributes both bonding electrons in a single covalent bond, the bond is called a(n) ___________.
a) one-sided covalent bond
b) unequal covalent bond
c) coordinate covalent bond
d) ionic covalent bond
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) inner shell electrons
c) mobile electrons
d) the electrons closest to the nuclei
What causes water molecules to have a bent shape, according to the VSEPR theory?
a) repulsive forces between unshared pairs of electrons
b) interaction between the fixed orbitals of the unshared pairs of oxygen
c) ionic attraction and repulsion
d) the unusual location of the free electrons
Which of the following atoms acquires the most negative charge in a covalent bond with hydrogen?
a) C
b) Na
c) O
d) S
How many unshared pairs of electrons does the nitrogen atom in ammonia (NH3) possess?
a) 1
b) 2
c) 3
d) 4
Which of the following covalent bonds is most polar?
a) H--F
b) H--C
c) H--H
d) H--N
What is the correct name of S2O5?
a) disulfur pentoxide
b) sulfur oxide
c) disulfide pentoxide
d) pentasulfur dioxide
What is the correct name of NO3?
a) nitrogen trioxide
b) nitride trioxide
c) mononitrogen trioxide
d) none of the choices
What is the correct formula for triphosphorus pentoxide?
a) P3O5
b) P5O3
c) P2O3
d) none of the choices
What is the correct formula for boron dioxide?
a) BO2
b) B2O
c) B2O3
d) none of the choices
What is the total number of covalent bonds normally associated with a single carbon atom in a compound?
a) 4
b) 3
c) 2
d) 1
How many electrons does a nitrogen atom need to gain in order to attain a noble-gas electron configuration?
a) 4
b) 3
c) 2
d) 1
How many electrons are shared in a double covalent bond?
a) 1
b) 2
c) 3
d) 4
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