CHEMICAL COMPOUNDS

Chemical bonding results in ________.

• increased stability

• decreased stability

• lower bond lengths

• lower density

The shielding effect is the tendency of inner energy level electrons to block the attraction of the nucleus for _________.

• neutrons

• protons

• other atoms

• valence electrons.

The CO molecule is _________.

• linear and polar.

• linear and nonpolar

• tetrahedral and nonpolar

• trigonal planar and polar

A solute is most likely to be highly soluble in a solvent if the solute is _____ and the solvent is ______.

• ionic or polar, non-polar

• non-polar, polar

• ionic or polar, polar

• non-polar, ionic

The boiling point of CH4 is much lower than that of HF. This is because:

• of ion-dipole interactions in CH4.

• HF is more polarizable.

• of hydrogen bonding in HF.

• CH4 is polar.

The intermolecular forces of attraction in the above substances is described by which of the following:

• ion-dipole forces

• dispersion (or London) forces

• dipole-dipole forces (permanent dipoles)

• gravitational forces

What type of intermolecular forces is due to the attraction between temporary dipoles and their induced temporary dipoles?

• metallic bond

• hydrogen bond

• London dispersion

• ionic bond

What type of interparticle forces holds liquid N2 together?

• ionic bonding

• dipole-dipole interaction

• London forces

• covalent bonding

Which statement is false?

• Molecular solids generally have lower melting points than covalent solids

• Metallic solids exhibit a wide range of melting points because metallic bonds cover a wide range of bond strength

• Most molecular solids melt at lower temperatures than metallic solids

• The interactions among the molecules in molecular solids are generally stronger than those among the particles that define either covalent or ionic crystal lattices

Which one of the following classifications is incorrect?

• H2O(s), molecular solid

• SiC(s), covalent solid

• C4H10(s), molecular solid

• S(s), metallic solid