Melting Points (Gizmo)
In general, which type of compound tends to have the lowest melting point? correct
answer A. Molecular Solids
An unknown substance is a white solid at room temperature and has a melting point of
78 C. Which of the following substances is most likely to be the identity of the unknown
sample? correct answer A. Naphthalene, a molecular solid with the formula C10H8
The following transition occurs at molecular level for a substance. What transition
corresponds to this change in microscopic structure? correct answer C. Sublimation; the
transition of a substance directly from the solid state to the gas state
What is the most important reason that caffeine (C8H10N4O2) has a lower melting point
than copper (II) chloride (CuCl2)? correct answer A. The intermolecular forces holding
the caffeine molecules together are weaker than the ionic bonds in CuCl2.
A petroleum refinery is producing the four products shown in the table. The table also
shows the state of matter at room temperature of each of the substances. All of these
compounds are molecular compounds consisting of only hydrogen and carbon. Which
of the following products is likely to have the highest molecular weight? correct answer
D. Paraffin wax
In general, which type of compound tends to have the lowest melting point? correct
answer A. Molecular Solids
An unknown substance is a white solid at room temperature and has a melting point of
78 C. Which of the following substances is most likely to be the identity of the unknown
sample? correct answer A. Naphthalene, a molecular solid with the formula C10H8
The following transition occurs at molecular level for a substance. What transition
corresponds to this change in microscopic structure? correct answer C. Sublimation; the
transition of a substance directly from the solid state to the gas state
What is the most important reason that caffeine (C8H10N4O2) has a lower melting point
than copper (II) chloride (CuCl2)? correct answer A. The intermolecular forces holding
the caffeine molecules together are weaker than the ionic bonds in CuCl2.
A petroleum refinery is producing the four products shown in the table. The table also
shows the state of matter at room temperature of each of the substances. All of these
compounds are molecular compounds consisting of only hydrogen and carbon. Which
of the following products is likely to have the highest molecular weight? correct answer
D. Paraffin wax
