Chemistry Concepts and Applications

Chapter 9: Chemical Bonding

Chapter Test Practice

1
What causes the bend in the graph of boiling points?

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A)H2O forms polar bonds, while the others form covalent bonds.
B)H2O forms covalent bonds, while the others form ionic bonds.
C)H2O forms ionic bonds, while the others form polar bonds.
D)H2O forms covalent bonds, while the other form polar bonds.
2
Covalent compounds have a Δ EN __________.

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A)greater than 2.0
B)between 2.0 and 0.5
C)less than or equal to 0.5
D)always equal to zero
3
What is the structure of the methane molecule?

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A)triangle
B)triangular pyrimid
C)tetrahedron
D)quadrilateral
4
Ethene is different from ethane in what way?

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A)In ethene, double bonds form between the hydrogen atoms.
B)In ethene, a double bond forms between the carbon atoms.
C)In ethene, a double bond forms between the carbon atom and one hydrogen atom.
D)In ethene, a triple bond forms between the carbon atoms.
5
Chemical bonding results in __________.
A)increased stability
B)lower bond lengths
C)decreased stability
D)lower density
6
The shielding effect is the tendency of inner energy level electrons to block the attraction of the nucleus for __________.
A)neutrons
B)other atoms
C)protons
D)valence electrons
7
An arrow points in the direction of the __________ of a polar covalent molecule.
A)bottom
B)center
C)negative end
D)positive end
8
The center of positive charge in the H2O molecule lies __________.

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A)between the two hydrogen atoms
B)on the oxygen atom
C)in the geometric center of the molecule
D)on one of the hydrogen atoms
9
Two atoms that share six electrons are said to be joined by a __________ bond.
A)double
B)hexyl
C)single
D)triple
10
The CO molecule is __________.
A)linear and polar
B)tetrahedral and nonpolar
C)linear and nonpolar
D)trigonal planar and polar
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