Practice Chapter 8 Test

structural formula
a depiction of the arrangement of atoms in molecules and polyatomic ions
single covalent bond
a covalent bond in which only one pair of electrons is shared
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double covalent bond
a covalent bond in which two pairs of electrons are shared
polar bond
a covalent bond between two atoms of significantly different electronegativities
hydrogen bond
a type of bond that is very important in determining the properties of water and of importantbiological molecules such as proteins and DNA
polar molecule
a molecule in which one end is slightly negative and the other end is slightly positive
sigma bond
symmetrical bond along the axis between the two nuclei
diatomic molecule
a molecule made up only two atoms
dipole interaction
attraction between polar molecules
VSEPR theory
because electron pairs repel, molecules adjust their shapes so that the valence-electron pairs are as far apart as possible
d. the ionic compound has ahigh melting point
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 poinnt
a. the arrangement of bonded atoms
What is shown by the structural formula of a molecule or polyatomic ion?
a. the arrangement f bonded atoms
b. the number of ionic bonds
c. the number of metallic bonds
d. the shapes of molecular orbitals
a. Ne
Which of these elements does not exist as a diatomic molecule?
a. Ne
b. F
c. H
d. I
c. two atoms share two electrons
How do atoms achieve noble-gas electron configuration in single covalent bonds?
a. one atom completely loses two electrons to te other atom in the bond.
b. two atoms share two pairs of elctrons
c.two atoms share two electrons
d. two atoms share one elctrom
b. neon
Which noble gas has the same electron configuration as the oxygen in a water molecule?
a. helium
b. neon
c. argon
d. xenon
a. o2
Which of the following diatomic molecules is joined by a double covalent bond?
a. O2
b. Cl2
c. N2
b. cl2
A molecule witha a single covalent bond is
a. CO2
b. Cl2
c. CO
d. N2
c. pi bond
A bond that is not symmetrical along the axis between two atomic nuclei is a(n)
a. alpha bond
b. sigma bond
c. pi bond
d. beta bond
a. pairs of valance of electrons
according to 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
c. polar covalent
A bond formed between a silicon atom and an oxygen atom is likely to be?
a. ionic
b. coordinate covalent
c.polar covalent
d. nonpolar covalent
a. hydrogen region of the molecule
When placed between opoositely charged metal plates, the region of a water molecule attracted to the negative plate is the?
a. hydrogen region of the molecule
b. geometric center of the molecule
c. H-O-H plane of the molecule
d. oxygen region of the molecule
b. motion of electrons
What is thought to cause the despersion forces?
a. attractioon between ions
b. motion of electrons
c. sharing of electrons pairs
d. differences in elecronegativity
b. attraction between polar molecules
What causes dipole interactions?
a. sharing of electron pairs
b. attraction between polar molecules
c. bonding of a covalently bonded hydrogen to an unshared electron pair
d. attraction between ions
d. bonding of a covalently bonded hydrogen atom with an unshared electron pair
What causes hydrogen bonding?
a. attraction between ions
b. motion of electrons
c. sharing of electron pairs
d. bonding of a covalently bonded hydrogen atom with an unshared electron pair
T or F: in a polar bond, the atoms are sharing electrons equally
There are only single covalent bonds in a molecule of water
In a molecule of hydrogen chloride, the chlorine has a slightly positive charge
the shape of a water molecule is liner
a molecule is a neutral group of covalently bonded atoms

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