Mr.Chow ? A.Law? K.Kwong? Which one is the real one? That's the question. And first I would tell you that the "real" for me is the one which is suitable for our AL syllabus. Now I would try to find out the only answer.
This is Mr.Chow's version. Which intermolecular force is divided into 2 major parts. Van Der Waals' force and Hydrogen bonding and Van Der Waals' force is then divided into 3 minor part,Dipole-Dipole,Dipole induced Dipole and Dispersion Force.
This one is K.Kwong's version. His notes got the same dividing of intermolecular force as Mr.Chow.And also he mentioned a very important point in his lesson.( Tell you later)
This one is A.Law's version.He divide intermolecular force into 3 parts,Van Der Waals' force,Dipole-Dipole attraction and H-bonding. Which is differ from Mr.Chow and K.Kwong. This is what I found in website of HKEAA
Here mentioned that intermolecular force is divided into Van Der Waals' force and hydrogen bonding which is same as Mr.Chow and K.Kwong. But you will further ask that why A.Law's one is wrong? The answer is the syllabus before 1997 and after 1997. Before 1997, Hong Kong is using the division of A.Law's version, after 1997 the syllabus changed and become the one we learnt from Mr.Chow. Sosad But there is another question that I can't find the answer That's the version in Wikipedia. http://en.wikipedia.org/wiki/Intermolecular_force Also called London forces, instantaneous dipole (or multipole) effects (spatially variable δ+) or Van der Waals forces, these involve the attraction between temporarily induced dipoles in nonpolar molecules (often disappear within an instant). This polarization can be induced either by a polar molecule or by the repulsion of negatively charged electron clouds in nonpolar molecules. An example of the former is chlorine dissolving in water: Which this one is same as A.Law . .................... |