edexcel IAL - intermolecular forces and London forces
im quite confused with those intermolecular forces..
among (1) permanent dipole-permanent dipole, (2) permanent dipole-induced dipole, (3) instantaneous dipole-induced dipole, (4) instantaneous dipole - instantaneous dipole interactions,
Q1)
which several of them actually exist?
In my local secondary school public exam, only (1), (2), (3) are mentioned,
but when i look into my IAL textbook as a private candidate, it mentions (1), (3), (4)
i think (4) does really make sense.. if one molecule has a dipole instantaneously, it could induce another molecule to have a dipole.. so there should not be (4), but only (3) when molecules in a substance or mixture do not have permanent dipole
Q2)
the IAL textbook also says that wan der Waals forces equal London forces, and include (3) and (4), where(4) could be specifically called London dispersion force
but in my local public exam syllabus , Van der Waals' forces include all intermolecular forces, i.e. (1), (2), (3), since we dont have (4) mentioned in the textbook or syllabus
so.. which one of them are actually London forces?
among (1) permanent dipole-permanent dipole, (2) permanent dipole-induced dipole, (3) instantaneous dipole-induced dipole, (4) instantaneous dipole - instantaneous dipole interactions,
Q1)
which several of them actually exist?
In my local secondary school public exam, only (1), (2), (3) are mentioned,
but when i look into my IAL textbook as a private candidate, it mentions (1), (3), (4)
i think (4) does really make sense.. if one molecule has a dipole instantaneously, it could induce another molecule to have a dipole.. so there should not be (4), but only (3) when molecules in a substance or mixture do not have permanent dipole
Q2)
the IAL textbook also says that wan der Waals forces equal London forces, and include (3) and (4), where(4) could be specifically called London dispersion force
but in my local public exam syllabus , Van der Waals' forces include all intermolecular forces, i.e. (1), (2), (3), since we dont have (4) mentioned in the textbook or syllabus
so.. which one of them are actually London forces?
Original post by kesun
so, could any one please tell me which few of them are London forces? :s
London dispersion forces are instantaneous dipole-induced dipole interactions, although this is commonly just expressed as induced dipole-dipole interactions.
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