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If you look at the structure of silicium dioxide, $\mathrm{SiO_2}$ consists of tetraeders (Silicium surrounded by 4 oxygen atoms) and these tetraeders on the other side are themselves connected to each other, as that they form a 2-D Network which is fairly large enough that this substance is solid. Also yes, the factor of 2.5 in mass makes a big difference, ...

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Anhydrous ammonia boils at -33C. To store it as a liquid, it must be either pressurized or refrigerated. If transfer is at -33C, it must be unpressurized. In this case, ammonia is a liquid at its boiling temperature. It behaves like boiling water on a stove. Adding heat makes it boil harder but does not raise the temperature. The reason for this is ...

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The melting point of nitrogen is greater than that of oxygen. Is gaseous oxygen really liquid oxygen dissolved in gaseous nitrogen? No. It is gaseous oxygen. "Water vapour in the air" (your phrase) is just that - vapour. Not liquid droplets "dissolved" in air. You may be confused by the fact that wet steam does contain water droplets, and the steam from a ...

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Make your hand into a fist and move it around as fast as you can, then blow on it, where did you feel more "wind"?

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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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The stronger positive nucleus of one atom firstly pulls the electron(s) of the other atom. This makes one atom positively charged and one negatively charged causing an ionic bond to be formed

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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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