Many other textbooks take a similar approach, defining dipoles,
hydrogen bonding, and dispersion forces and then using data,
such as boiling points or heats of vaporization, to support the
definition. In the Data First approach, students are allowed to
explore the heats of vaporization of simple molecules (shown in
Table 3) prior to a discussion of intermolecular forces so that
they can begin to build their own conceptual understanding of
the strength of intermolecular attractions and the type of
intermolecular bonding present. This approach is an adaptation
of a previously published lesson on inquiry approaches to teaching intermolecular forces using boiling point data.27 It is
important to note that discussion of heats of vaporization
should occur prior to this discussion of intermolecular forces in
the course sequence. However, if heats of vaporization have not
yet been covered, a similar approach can be used with boiling
point data instead.
When students graph this data, trends are illuminated. First,
students are only given the data for the Group IV hydrides.
When they graph the data for the Group IV hydrides against
total number of electrons in the molecule, they will find a trend
as shown in Figure 3.
Many other textbooks take a similar approach, defining dipoles,
hydrogen bonding, and dispersion forces and then using data,
such as boiling points or heats of vaporization, to support the
definition. In the Data First approach, students are allowed to
explore the heats of vaporization of simple molecules (shown in
Table 3) prior to a discussion of intermolecular forces so that
they can begin to build their own conceptual understanding of
the strength of intermolecular attractions and the type of
intermolecular bonding present. This approach is an adaptation
of a previously published lesson on inquiry approaches to teaching intermolecular forces using boiling point data.27 It is
important to note that discussion of heats of vaporization
should occur prior to this discussion of intermolecular forces in
the course sequence. However, if heats of vaporization have not
yet been covered, a similar approach can be used with boiling
point data instead.
When students graph this data, trends are illuminated. First,
students are only given the data for the Group IV hydrides.
When they graph the data for the Group IV hydrides against
total number of electrons in the molecule, they will find a trend
as shown in Figure 3.
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