Name: ____________________________________________ Hr: ______ Date: _____________ A
H Chem 10-11 Unit 5 Quiz #1 IMF
Bond Type
Nonpolar Covalent
Polar Covalent
Ionic
Difference in Electronegativity (use absolute
value)
0.0 – 0.4
0.5 – 2.0
2.1 or higher
1. (4 pts)
Formul A. Structural Formula (remember
a
unshared pairs!)
B. Number of
e- domains
around central
atom
B. Name of Shape of Classify
Molecule
structure as
nonpolar,
polar, or
ionic
FCP
CBr4
Match each of the following statements with the appropriate bond type. Letters must be written clearly to
be considered for credit.
P = polar covalent bond
I = ionic bond
N = nonpolar covalent bond
2. _____ Bond formed between the following atoms: O--O
3. _____ One end of the bond has a partial negative charge and the other end has a partial positive charge
4. _____Electrons are not shared, but actually taken by the more electronegative element
Name: ____________________________________________ Hr: ______ Date: _____________ A
5. _____ Bond formed between the following atoms: H—O
6. _____Neither end of the bond has a charge
7. _____ Bond formed between the following atoms: Na and F
8. _____Electrons are shared, but spend more time with the more electronegative atom
9. _____One end of the bond has a full positive charge and the other end has a full negative charge since
one atom gave up its valence electrons and the other atom is taking all the valence electrons
10. _____ Electrons are shared equally between the two atoms
Bonus: ______ Due to electrostatic attraction between charged particles
11. This molecular shape has the largest bond angle
a. Linear
b. Bent
c. Trigonal planar
d. Tetrahedral
e. Trigonal pyramidal
12. For the following pair of atoms, draw the dipole arrow and partial charge symbols:
N-----------------O
13. The following questions refer to the molecules of SiS2 and H2O.
a. (2) Each molecule consists of a central atom bonded to two other atoms. Which molecule has a
smaller angle between the bonded electrons? Make your claim, provide evidence to support your
claim (about each structure!! Drawing alone is not sufficient), then provide a statement
explaining how the evidence supports your claim.
Misconceptions:
1. Shape is not the reason—shape is a consequence of bond angle, not a cause
2. The atoms are NOT repelling each other; the electron domains repel one another
3. SiS2 does have unshared pairs—but they are not on the central atom. If you are using unshared pairs in
your answer then specify the unshared pairs on the central atom (or actually say the name of that atom).
4. Mentioning unshared pairs are more repulsive than shared pairs was not necessary since each molecule
has a different number of domains on the central atom. Unshared pairs are a factor when there is an
equal number of domains on the central atom.
5. You MUST make explanation specific to example—some were so general they could apply to anything.
6. It is not my job to interpret your drawings. If you use drawings, explain them. Imagine you a lawyer
presenting your side to a jury. You wouldn’t just show them the picture and leave it up to them to
decide if it helps your case—you would explain to them how the picture supports your case.
7. two examples—address both!
Sample full credit:
Name: ____________________________________________ Hr: ______ Date: _____________ A
H2O has a smaller bond angle. H2O has 4 electron domains on the central atom while SiS2 has just 2 electron
domains on its central atom. Since H2O has more electron domains, each domain has less space to occupy
which causes the bonds to be closer.
b. (2) Each molecule consists of only polar bonds, yet one molecule is polar and the other is
nonpolar. Determine which molecule is polar and which is nonpolar. Provide
evidence/reasoning to support your claims.
Misconceptions:
1. You MUST make explanation specific to example—some were so general they could apply to anything.
For example, saying H2O is polar b/c it has a positive and a negative side is too general. All polar
molecules have positive and negative sides. Specify—electrons are drawn to the oxygen atom making
the oxygen area negative and the hydrogen area positive.
2. It is not my job to interpret your drawings. If you use drawings, explain them.
3. Do not say ‘the arrows point to…”; say ‘electrons are drawn to…”; there aren’t really arrows in
molecules
4. because the question already said all the bonds were polar there is no need to explain that they are polar.
If the question did NOT say the bonds were polar then you WOULD have to describe bond type.
5. two examples—explain each
Sample full credit:
H2O is polar because the shared electrons are pulled toward the oxygen atom, creating a negative area by
the oxygen and a positive by the hydrogens. Because there is a positive and a negative area, H2O is polar.
SiS2 is not polar because the electrons are drawn to two opposite areas of the molecule. Since electrons are
not clustered to one area, it is a no polar.