UNE - Chem 1011 - Midterm Study Guide Questions With Complete Solutions

A hydrogen bond is characterized by A. the attraction of temporary dipoles produced by the random asymmetries in electron motion B. the electrostatic attraction between the permanent dipoles in any polar molecule C. the highly concentrated partial charge between an H atom and F, O, or N atoms D. the covalent sharing of electrons between two atoms in a molecule correct answer: C. the highly concentrated partial charge between an H atom and F, O, or N atoms (Ref: Week 1 Quiz) A. LDF's B. Dipole-Dipole D. Covalent Bond Which of the following will have the strongest dipole-dipole attractions? A. NCl3 B. CCl4 C. BCl3 D. Cl2 correct answer: A. NCl3 (Ref: Week 1 Quiz) Asymmetrical - Usually have a higher dipole moment Why not BCl3? Because Nitrogen is more electronegative than Boron. A cohesive force A. is the result of the intermolecular forces that attract identical molecules B. is the result of the intermolecular forces that attract different molecules together C. is the result of covalent interactions between atoms in a molecule D. is always stronger than an adhesive force correct answer: A. is the result of the intermolecular forces that attract identical molecules (Ref: Week 1 Quiz) Easy way to remember. Co = mutual so cohesive is identical