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Lesson 10
298
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ARCO
■ SAT II Subject Tests
Part B
Assertions (I)
Reasons (II)
101. The molecule SO
2
has a net dipole
BECAUSE
oxygen has a higher electronegativity
than sulfur.
T
F
The correct reason is because the molecule is nonlinear. Polar bonds are not sufficient to give a molecule
a net dipole.
102. NO
3
–
and CO
3
–
are planar species
BECAUSE
each ion has three equal bonds
distributed equivalently in space.
T
T
CE
Both statements are true, and statement II is the correct explanation of statement I.
103. The heat of fusion plus the heat of
BECAUSE
∆H
fus
, H
vap
, and H
sub
are state functions.
vaporization for a particular substance
is not equal to the heat of sublimation
F
T
∆H
fus
+ 
∆H
vap
= 
∆H
sub
104. The alkali metals are found in their
BECAUSE
they react vigorously and completely
elemental state in nature
with many other elements.
F
T
The alkali metals are never found in their because elemental state in nature the second statement is true.
105. A catalyst increases the equilibrium of
BECAUSE
catalysts only lower the activation
a reaction
energy of the forward reaction.
F
F
Catalysts do not alter equilibrium constants. They lower the activation energy of both the forward and
backward reactions.
106. Water boils at a higher temperature on
BECAUSE
the atmospheric pressure of the
the moon
moon is less than that on earth.