PHYSICAL SCIENCE 102 HWKEVAL#5[g]
CURRENT DATE and TIME

How many electrons are used to draw the electron-dot structure for hydrogen peroxide (a covalent compound with the formula H₂O₂)?

Your answer:
none of these
4
14
8
7


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How many electrons are used to draw the electron-dot structure for acetylene (a covalent compound with the formula, C₂H₂)?

Your answer:
10
5
12
none of these
8


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What elements tend to form ionic compounds?

Your answer:
metallic elements
elements found on opposite sides of the periodic table
those found in the upper right hand side of the periodic table
Not enough information
Any two elements of the same phase can form an ionic compound.


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Magnesium ions carry a 2+ charge, and chloride ions carry a 1- charge. What is the chemical formula for the ionic compound magnesium chloride?

Your answer:
Mg₂Cl₂
none of these
Mg₂Cl
MgCl
MgCl₂


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Barium ions carry a 2+ charge, and nitrogen ions carry a 3- charge. What would be the chemical formula for the ionic compound barium nitride?

Your answer:
Ba₂N₂
Ba₃N₄
none of these
Ba₂N₃
Ba₃N₂


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Salts are made of elements found on opposite ends of the periodic table because elements on

Your answer:
none of these
the far left tend to form negative ions while those on the right tend to form positive ions.
opposite ends of the periodic table have similar arrangements of electrons.
Not true! Salts are generally made of elements found on the same side of the periodic table.
the far left tend to form positive ions while those on the right tend to form negative ions.


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The individual particles of an ionic crystal are

Your answer:
atoms.
molecules.
ions.
electrons.


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Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92).


O with F    Ca with Cl    Na with Na

Your answer:
covalent, ionic, covalent
covalent, ionic, neither
none of these
ionic, covalent, neither
neither, ionic, covalent


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Why do nonpolar substances tend to boil at relatively low temperatures?

Your answer:
Not much heat is required to separate nonpolar molecules from one another.
Nonpolar substances are not good conductors of heat.
If they did not boil at low temperatures they wouldn't be gases at room temperature.
none of these
Generally speaking, nonpolar molecules are not as massive as polar molecules.


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The boiling temperature of water is so much higher than that of methane because water molecules are

Your answer:
smaller.
polar.
composed of fewer atoms.
more massive.


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In a molecular dipole, electrons are distributed

Your answer:
unevenly because they tend to stay close the atom they were with originally.
evenly so they can achieve the farthest possible distance from one another.
evenly since they move so fast.
unevenly because the nuclear charge at one end of the molecule is stronger thus pulling electrons toward that side.


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