Intermolecular Forces — Unit test Answers
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21
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Which statement best describes the effect of low ionization energies and low electronegativities on metallic bonding?
A
The valence electrons are easily delocalized.B
The valence electrons stay in a single orbital.C
The valence electrons break free of the crystals.D
The valence electrons move closer to the nuclei.22
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Which is the Lewis structure for H3PO4?
A
mc013-1.jpg
B
A central upper P is single bonded left, right, above, and below to upper Os. The O above the P is single bonded to upper H on the left and the right, and has two electron dots above it. The O below the P is single bonded to an H below, and has pairs of electron dots to the left and right.
C
A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
D
A central upper P is bonded to an upper H above, an upper O below, and upper O's bonded to upper H's to the left and the right. The O below the P has three pairs of electron dots, to the left, right, and below; the other two O's have pairs of dots above and below. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
23
Which formula represents the compound commonly known as phosphine with IUPAC name phosphorus trihydride?
A
PHB
PH2C
PH3D
PH424
When applied to a dish, soap makes grease soluble in water. Which explanation correctly supports the role of intermolecular forces in this common observation?
A
The nonpolar end of a soap molecule attaches itself to grease.B
The nonpolar end of a soap molecule attaches itself to water.C
The polar soap molecule attaches itself to the dish.D
The polar soap molecule attaches itself to a nonpolar soap molecule.25
Which reason best explains why metals are shiny?
A
because their valence electrons reflect lightB
because their valence electrons absorb lightC
because their valence electrons oscillate between bandsD
because their valence electrons move to higher energy levelsDid you find these answers helpful?
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