Name: 
 

Ch 8 - Covalent Bonding Section 1 & 2 Test


Multiple Choice (Value 10)
Identify the choice that best completes the statement or answers the question.
 

 1. 
Which is a typical characteristic of an ionic compound?
a.
Electron pairs are shared among atoms.
b.
The ionic compound has a low solubility in water.
c.
The ionic compound is described as a molecule.
d.
The ionic compound has a high melting point.
 

 2. 
What is shown by the structural formula of a molecule or polyatomic ion?
a.
the arrangement of bonded atoms
c.
the number of metallic bonds
b.
the number of ionic bonds
d.
the shapes of molecular orbitals
 

 3. 
Which of these elements does not exist as a diatomic molecule?
a.
Ne
c.
H
b.
F
d.
I
 

 4. 
How do atoms achieve noble-gas electron configurations in single covalent bonds?
a.
One atom completely loses two electrons to the other atom in the bond.
b.
Two atoms share two pairs of electrons.
c.
Two atoms share two electrons.
d.
Two atoms share one electron.
 

 5. 
Which noble gas has the same electron configuration as the oxygen in a water molecule?
a.
helium
c.
argon
b.
neon
d.
xenon
 

 6. 
Which of the following electron configurations gives the correct arrangement of the four valence electrons of the carbon atom in the molecule methane (CHmc006-1.jpg)?
a.
2smc006-2.jpg2pmc006-3.jpg
c.
2smc006-7.jpg2pmc006-8.jpg3smc006-9.jpg
b.
2smc006-4.jpg2pmc006-5.jpg3smc006-6.jpg
d.
2smc006-10.jpg2pmc006-11.jpg
 

 7. 
A molecule with a single covalent bond is ____.
a.
COmc007-1.jpg
c.
CO
b.
Clmc007-2.jpg
d.
Nmc007-3.jpg
 

 8. 
When Hmc008-1.jpg forms a bond with Hmc008-2.jpgO to form the hydronium ion Hmc008-3.jpgOmc008-4.jpg, this bond is called a coordinate covalent bond because ____.
a.
both bonding electrons come from the oxygen atom
b.
it forms an especially strong bond
c.
the electrons are equally shared
d.
the oxygen no longer has eight valence electrons
 

 9. 
How many valid electron dot formulas—having the same number of electron pairs for a molecule or ion—can be written when a resonance structure occurs?
a.
0
c.
2 only
b.
1 only
d.
2 or more
 

 10. 
In which of the following compounds is the octet expanded to include 12 electrons?
a.
Hmc010-1.jpgS
c.
PClmc010-3.jpg
b.
PClmc010-2.jpg
d.
SFmc010-4.jpg
 

Numeric Response (Value 5)
 

 11. 
How many electrons does a nitrogen atom need to gain in order to attain a noble-gas electron configuration?

 

 12. 
How many electrons does carbon need to gain in order to obtain a noble-gas electron configuration?

 

 13. 
How many electrons are shared in a double covalent bond?

 

 14. 
How many covalent bonds are in a covalently bonded molecule containing 1 phosphorus atom and 3 chlorine atoms?

 

 15. 
What is the bond angle in a water molecule?

 

Essay
 

 16. 
What is bond dissociation energy, and how does it affect carbon compounds?
 



 
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