Download Chemistry II Polarity Homework

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Chemistry II Worksheet: Polarity Practice
Complete each of the following sentences by filling in the appropriate word from below:
nonpolar
equally
polar
electric
unequally
polarity
negative
molecule
shape
1. In a polar bond, electrons are shared ___________________ between two atoms.
2. A molecule that is composed of only one kind of atom is a(n) _____________________ molecule.
3. The ________________________ of a molecule, as well as the polarity of the bonds, determines
the polarity of a molecule.
4. In a polar molecule, one end of the molecule is positive and the other end is ________________.
5. Polar molecules align themselves in a(n) ______________________ field.
6. The ___________________________ of a large molecule helps to determine its shape.
Identify each of the following molecules as a polar or nonpolar molecule. Write polar or nonpolar on
the line provided.
7. HF
8. F2
9. H2O
10. O3
11. CBr4
12. C2H4
13. Illustrate the molecular shape of each of the following molecules. Identify each molecule as polar
or nonpolar.
a. BFI2 (boron makes 3 single bonds)
Chemistry II Polarity Homework
b. NH2Cl (Cl is chlorine)
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c. SCl2
d. BF3
e. H2O
f. CO2
g. CCl4
h. NF3
Answer each of the following questions in the space provided:
14. Why is HCl a polar molecule while Cl2 is a nonpolar molecule.
15. Explain why water has different properties from carbon dioxide even though both of these
molecules contain polar bonds. Base your answer on the molecular structure of these substances.
16. The proteins in many cells contain both polar and nonpolar sidechains. The nonpolar sidechains
are usually found on the inside of the protein, while the polar sidechains are found on the outside
facing the cell's cytoplasm, which is mostly water. Explain why proteins assume this type of structure.
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