few questions on molecular forces


by asdff529
Tags: forces, molecular
asdff529
asdff529 is offline
#1
Nov29-12, 08:15 AM
P: 29
A book said that a liquid made up of non-polar molecules shows no deflection when a charged rod is placed near the liquid
But if we place the charged object near an insulator,the insulator would be induced and therefore,they will stick together.(dont know im correct
Another question:
A hydrogen bond is the electromagnetic attractive interaction of a hydrogen atom and an electronegative atom, such as nitrogen, oxygen or fluorine, that comes from another molecule or chemical group.
But according to the Pauling scale,N and Cl have the same value,so why HCl doesnt have hydrogen bond?
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Ygggdrasil
Ygggdrasil is offline
#2
Nov29-12, 10:00 AM
Other Sci
Sci Advisor
P: 1,342
On the subject of a charged rod deflecting a stream of liquid, see the following PF thread:
http://www.physicsforums.com/showthread.php?t=559505

In particular the papers posted by f.c. (http://pubs.acs.org/doi/pdfplus/10.1021/ed077p1520) provides the following explanation:
In fact, the explanation for electrical deflection of a polar
liquid droplet stream is that the polar liquid droplets carry an
induced electrical charge. Electrical charging induced in water
droplet streams by nearby charged objects has been known
for well over two centuries, the first such observation being
attributed by Benjamin (5) to Jean Théophile Desaguilers
(1683–1744). (For a more recent review of static electrification
phenomena, see Loeb [6 ].) The effect results from a charge
separation in the water droplet as it forms, induced by the charge
on the nearby deflection device. As the droplet separates, a
fraction of the like charges repelled by the deflector statistically
remain behind in the water reservoir so that the droplet acquires
a net charge opposite to the charge on the deflector and is
attracted to it.


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