Definition

In molecular Chemistry, a semi-developed formula is a simplification of a developed Formule planes, in which one does not represent the connections Carbone - Hydrogène.
The principle of representation of the Atome S is the same one: a letter, resulting from the periodic Tableau of the elements, and a feature by connection (or several if the connection is double or triple).

For example, the Octane (C₈H₁₈):

developed Formula:

semi-developed Formula:

One can also reverse the C and the H to insist on the connections carbon-carbon, such as for example for the Propane, (C₃H₈):

One can also respect the geometry of the molecule, by respecting for example the angles of 120° certain molecules.

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Examples of semi-developed formulas

• the ethane (C₂H₆):

• the ethanol (C₂H₆O):

• the acetic Acid (or ethanoic acid) (CH₃COOH):

• the 2-méthylpropane (C₄H₁₀):

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Appendices

See also:

• various systems of Representation of the molecules
• chemical Equation
• the Organic chemistry
• the inorganic Chemistry