![]() These look a lot like the Lewis Structures you probably learned to draw in Introductory Chemistry 1, but without the nonbonding electron pairs. Structural formulas: which show every atom with its elemental symbol and every bond drawn as a line. ![]() In organic chemistry we make use of different types of formulas for this reason. The substance to the right has a boiling point of 28 ✬, so it is a liquid at room temperature.Īs we begin to consider and study organic molecules we very quickly are faced with this fact: molecular structures (showing the number and types of atoms in a molecule, such as H 2O) are inadequate to describe these substances. The substance to the left has a boiling point of 9.5 ✬, making it a gas at room temperature. But they look different, and it turns out they are: the properties of these substances are similar but not exactly the same. Each contains 5 carbon atoms and 12 hydrogen atoms. ![]() Both of these structures are representations of organic molecules.
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