In the PhET simulation window, click on the Microwave button to access a light s
ID: 1062918 • Letter: I
Question
In the PhET simulation window, click on the Microwave button to access a light source with a wavelength for microwaves. Be sure to turn the light source on by dragging the on switch (on the light source) from left to right. In the molecule navigation menu to the right-hand side of the screen, click on each molecule to see microwaves affect each species. Repeat this process with the Infrared button selected as well. You should notice that light in the infrared range affects molecules with polar bonds regardless of the presence of a permanent dipole, whereas light in the microwave range causes only molecules with a permanent dipole to rotate. Sort the following molecules based on whether or not they are affected by exposure to infrared (contains a polar bond only) and microwave (contains a permane dipole) radiation. Some molecules are available in the PhET simulation and can be tested there. Others will have to be sorted based on predictions deduced from their structure alone. Drag the appropriate items to their appropriate bins. Infrared only Infrared and microwave NeitherExplanation / Answer
CO2 and CCl4 do not have permanent dipole moments but their dipole moment changes while vibrating in different vibrational modes. All vibrational modes do not necessarily be IR active.
O2, H2, N2 neither have permanent dipole moment nor do they changing dipole moment while vibrating. such molecules can be studied using Raman spectroscopy.
Infrared ONLY Infrared and microwave Neither CO2 and CCl4 CO, O3, NO2, CH2F2, H2O O2, H2, N2