Molecular-Shape: Non-ABn Molecules

*Its All about Pj Problem Strings (S _{i}P_{j}A_{jk}) -
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Molecular Shape: Non-ABn Molecules

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1. Define the following: (a) ABn Molecules (b) Non-ABn Molecules

2. Given the following Lewis Structure of acetic acid (fig 1). Predict the molecular geometry of acetic acid from its Lewis structure and the bond angles associated with its geometry

3. Write the general representative strings for Non-ABn Molecules.

1(a) *AB _{n}* molecules are molecules (or ions) that have a single central atom bonded to two or more atoms of the same type. For example, CH

1(b)

2. The Lewis structure of acetic acid as shown, has three *interior atoms*: the leftmost C atom, the central C atom and the rightmost O atom. Each of these atoms is considered as a central atom and the electron-domain geometry is determined.
*Leftmost C atom as a central atom*: there are 4 electron-domains and all are bonding domains. Therefore the predicted electron-domain geometry and molecular geometry are both *tetrahedral*. Consequently the predicted bond angle is 109.5^{o}.
*Central C atom as a central atom*: there are 3 electron-domains and all are bonding domains. Therefore the predicted electron-domain geometry and molecular geometry are both *trigonal planar*. The predicted bond angle will deviate slightly from the usual 120^{o} because of the space demand of the double bond.
*Rightmost O atom as a central atom*: there are 4 electron-domains. 2 bonding domains and 2 nonbonding domains. Therefore the predicted electron-domain geometry is *tetrahedral* and its molecular geometry is *bent* because of the 2 nonbonding domains which also cause a slight deviation of the bond angle from 120^{o}.

The integrated molecular geometry is as follows:

3. Non-ABn molecules are compounds. S_{7}P_{1}A_{17} is the general representative string for the structure of a compound because the location of the constituents of a compound relative to one another establishes its structure. (S_{7}P_{3}A_{31})_{chemical bonds} is the key string implicit in the representative string.

The *point* **.** is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.

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