BIOL 104 Chapter Notes - Chapter 3: Intermolecular Force, Metallic Bonding, Boiling Point
Document Summary
Don"t read 10. 3-10. 7, except for p457-461the structure of crystals will not be on the ap exam. When a substance melts, some of the attractive forces holding the particles together are broken or loosened so that the particles can move freely around each other but are still close together. The stronger these forces are, the more energy is needed to overcome them and the higher the melting temperature. A substance with strong intermolecular forces will have a high boiling point. Metallic bonding gets stronger with higher charge of the cation the metal forms. Metallic bonding is thought of as cations in a sea of delocalized electrons. Example: sodium, magnesium and aluminum are all metals. They have metallic bonding, in which positive metal ions are attracted to delocalized electrons. Si and c make giant covalent structures with many covalent bonds. The more bonds made, the harder it is and the higher the melting point.
