p. 231
True or False
_____1.) A chemical bond results from the mutual attraction of the nuclei for dipoles.
_____2.) A nonpolar covalent bond is unlikely to form between two atoms that differ in electronegativity.
_____3.) To draw Lewis structure, it is not necessary to know the types of atoms in the molecule.
_____4.) Multiple covalent bonds may occur in atoms that contain carbon, nitrogen, or hydrogen.
_____5.) The Lewis structure of methane, CH4, contains eight covalent bonds.
_____6.) VSEPR states that the electrostatic repulsion between electron pairs surrounding an atom causes these pairs to be oriented as far apart as possible.
_____7.) In a polar covalent bond, the electronegativity of the two atoms is different, but the electrons are still shared by both atoms.
_____8.) According to the VSEPR theory, the shape of an AB4 molecule with no unshared electrons would be bent.
_____9.) Compared with covalent bonds, the strength of intermolecular forces is generally weaker.
_____10.) In writing a Lewis structure for a polyatomic ion, one electron must be added for each unit of positive charge.
_____11.) In Lewis electron-dot structures the atomic symbol represents the atomic number.
_____12.) Due to the presence of an unshared pair of electrons, the shape of ammonia, NH3, is trigonal pyramidal.
_____13.) The energy released in the formation of a covalent bond is the difference between zero and the minimum potential energy.