Cracolice 2/e Ch 11-12.
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Quiz is "closed book" except for PT & calculator (although the calculator really isn't needed for this particular quiz). If a question requests an explanation, there may be no credit unless you have provided an explanation.
1. In general, the shape of a triatomic molecule is either "linear" or "bent".
2. The general idea of this question is to follow the same issues as in #1, but now with tetratomic molecules -- with three atoms attached to a central atom. That is, these are TH3.
3. [The answer page shows a single table for parts a and b of this question, all together. The two parts, and their sub-parts, will guide you through this a little at a time.]
a. Consider the nitronium ion, NO2+.
- How many valence electrons does this ion have? (Check yourself on this key point before continuing.)
- Draw the Lewis structure.
- Give the electron geometry.
- Give the molecular shape.
b. Now consider NO2 (the nitrogen dioxide molecule) and NO2- (the nitrite ion). Go through the same questions asked in part a. For one of these you will be unable to satisfy the octet rule, for an obvious reason; do the best you can in this case.
c. This part is somewhat off topic, but presents a logical follow-up to an issue raised above. What do you think would happen if two molecules of nitrogen dioxide got very near each other? Show a Lewis formula for the product.
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Last update: August 15, 2011