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There are three main types of van der Waals forces: Keesom forces: Dipole to dipole attraction between oppositely charged ends of permanent dipole molecules. Hydrogen bonding is an especially strong form of Keesom force. It's responsible for water condensing into liquid and solid form at temperatures prevailing on our planet, and for loosely maintaining ...

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The average speed of the molecules depends on the temperature, not the pressure. That drives the energy available from collisions. On average, there is no more energy available at high pressure than at low pressure. At higher pressures, there will be more collisions, so ones at the top end of the energy spectrum become more common (as do all the others). ...

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What is important in the idea of resonance with water is to establish a frequency of excitation that causes the natural frequencies to superimpose or wave superposition. By achieving wave superposition the amplitude of the oscillations will have the greatest potential of breaking the molecule into its elemental constituents thereby creating free atoms that ...

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The right way to derive the total energy is to put the particles one by one. In a space centered at $e_1$ and having nothing else, the energy to bring $p_1$ from far away to a distance $r_0$ is $E_{e_1,p_1}$, this you know how to calculate. The energy to put $e_2$ at its position will have two terms coming from $e_1$ and $p_1$. By superposition, this ...

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There are 3 ways for a molecule to store energy, excluding electronic energy. Those three ways are translation (the molecule just moving), rotation, and vibration. All molecules can translate in each of the three Cartesian planes. You can also imagine that a non-linear molecule, could rotate in all the planes (xy plane, xz plane, yz plane). A linear molecule ...

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I am not too certain of what you are asking. If you are asking why do we not look at a molecule and then just identify the number of independent modes of vibration the answer is that it would be too hard. Real oscillations are a linear superposition of these normal modes, even undergrad spectra are often complicated. Only very simple diatomic give nice Raman ...

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