Chem 120, Summer Quarter 2011
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EXPERIMENT 2 – MOLECULAR GEOMETRY
PRE-LAB EXERCISE
Make sure to report ALL numbers with correct units and the
proper number of significant figures indicated.
1. Which period 3 element do the following Lewis electron dot symbols represented by
the letter “X” correspond to? Write the element symbol in the blanks provided.
________
________
________
________
2. Draw Lewis structures for the following molecules (continued on the next page).
Cl2
H2
CH4
Chem 120, Summer Quarter 2011
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NF3
SeO2
H2CCH2
CO
H2S
Chem 120, Summer Quarter 2011
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3. Draw the Lewis structure for each molecule below, and indicate its electron-pair geometry and
molecular geometry for each. Circle the molecules that have an overall molecular dipole.
PH3
CN–
SO42–
SO2
Chem 120, Summer Quarter 2011
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4. Draw all possible resonance structures for the following molecules. Which of these
has an overall molecular dipole?
CO32–
NO2–