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101. The molecule SO
2 
has a net dipole
BECAUSE
oxygen has higher electronegativity
than sulfer.
102. NO
3
–
and CO
2
–
are planar species
BECAUSE
each ion has three equal bonds
distributed equivalently in space.
103. The heat of fusion plus the heat of
BECAUSE
∆H
fus
, 
∆H
vap
, and 
∆H
sub
are state
vaporization for a particular substance
functions.
is not equal to the heat of sublimation
104. The alkali metals are found in their
BECAUSE
they react vigorously and completely
elemental state in nature
with many other elements.
105. A catalyst increases the equilibrium
BECAUSE
catalysts only lower the activation
of a reaction
energy of the forward reaction.
106. Water boils at a higher temperature
BECAUSE
the atmospheric pressure of the moon
on the moon
is less than that on earth.
107. Element Z with an electronic
BECAUSE
each atom of Z needs two electrons to
configuration of 1s
2
2s
2
2p
5
can be
fill its valence shell.
expected to form the compound MgZ
2
108. A reaction with a positive enthalpy
BECAUSE
the Gibbs free energy for a
and a negative entropy will be
spontaneous reaction is negative.
spontaneous
109. Sodium has a larger atomic radius
BECAUSE
sodium is lighter than phosphorous.
than phosphorous
Assertions (I)
Reasons (II)
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Lesson 10
290
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