Substance Structure & Bonding

A molecule (molecular substance) is chemically made of two or more atoms combined a in a fixed ratio.

• Molecules physically behave as a discrete unit (individually separate and distinct).
• Substances when chemical combined can chemically react to form new substances.

Before drawing chemical structures—Lewis structure—for organic and inorganic substances.

• Are you able to effectively (ICAO) in identifying substance type? If not (click here) before continuing.

Here are some important ideas to focus our attention when drawing chemical structure:

For organic substances:

• Organic substances have chemical formulas that begin with the letter C, followed by letter H.
• Never forget, carbon ALWAYS wants four (4) bonds, CH₄ , hydrogen only one bond.

For inorganic substances:

• COUNT VALANCE ELECTRONS!!!!! for all inorganic substances

When evaluating the stability for organic and inorganic substances

• Remember, Octet Rule is KING!
• the "octet rule" must be applied and MUST be obeyed in evaluating the stability of inorganic and organic molecules

Lastly, three or more atoms are chemically bond together, a geometric angle is produced.

• Use VSEPR theory, to predict the angle and geometry about individual atom connections.
• VSEPR is an empirical theory are based on pure observation,
• An example of an empirical theory "birds have feathers, thus all animals with feathers must be birds."

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• Studying all linked resources —handouts, videos, powerpoints, and PDFs—associated with these directions.
• Before continuing to Molecular Geometry& Polarity review all content topics and resources summarized here by clicking on 'Next.'

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in "adopting elemental steps for incremental success,"That's Incredimental!!!"

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