Period: ______________________
Section: ______________________
Grade: __________/20
points
1/28/02, 1/29/02 Regular Chemistry Homework
Read pages 255-265 in Chapter 8 of your book.
Answer the following questions pertaining to that
material:
1) Referring to figure 8-2, you might conclude that an ammonia molecule has a T-shape. Is this correct?
2) What are ball and stick
models used for? What does the ball
represent in these models? The sticks?
3) What is a linear shape? What is a triangular shape? What are
pyramidal shapes? Are all these shapes symmetrical? What does it mean to be symmetrical?
4) What is the VESPR
theory? What does the VESPR theory
state? Is this theory always applied in chemical situations?
5) Explain linear molecules,
their bond angles and give some examples.
6) What is trigonal planar
shaped molecule? Give some examples, and what are their bond angles?
7) What is a tetrahedral shaped
molecule? Give some examples, and what are their bond angles? (More than one)
8) What are pyramidal shaped
molecules? Give some examples, and what
are their typical bond angles? Why do
molecules take this shape?
9) What is a bent molecule? What molecule represents a bent molecule?
What is the bond angle of this molecule?
What causes the “bentness” of this molecule? Why is this molecule
shape’s so significant?
10) What are hybrid
orbitals? Draw the following:
sp
sp2
sp2
11) What kind of hybrid orbitals
are in a molecule of boron trichloride? Methane? Water?
12) What two important trends in
bond length you should be aware of?
13) Many fruits produce ethane,
which helps them ripen. The molecular
formula for ethane is C2H4, and the 2 carbon atoms are
joined by a double bond. Draw a
structural formula and a ball-and-stick model for ethane. Identify the hybrid orbitals on each carbon
atom and estimate the bond angles.