MCB 3020C Chapter Notes - Chapter 2: Nitric Oxide, Monomer, Bond Energy

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26 Aug 2020
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The carbon atom (c) is the most important atom in biological molecules. C has a valence of 4: it can form four chemical bonds with other atoms. Carbon atoms are most likely to form covalent bonds with other carbon atoms and with oxygen (o), hydrogen (h), nitrogen (n), and sulfur (s). Covalent bonds: the sharing of a pair of electrons between two atoms. Sharing one pair of electrons between two atoms forms a single bond. Double bonds and triple bonds involve two atoms sharing two and three pairs of electrons, respectively. Stability is expressed as bond energy: the amount of energy required to break 1 mole of such bonds. Covalent bonds are stable/strong: energy required to break the bond > thermal energy of a molecule. The visible portion of sunlight is lower in energy than c-c bonds: visible light cannot break the bonds of organic molecules. A large variety of compounds can be formed by relatively few kinds of atoms.

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