few questions on molecular forces

by asdff529
Tags: forces, molecular
asdff529 is offline
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?
Phys.Org News Partner Chemistry news on Phys.org
Repeated self-healing now possible in composite materials
Potent, puzzling and (now less) toxic: Team discovers how antifungal drug works
Research offers 'promise' of improved food safety
Ygggdrasil is offline
Nov29-12, 10:00 AM
Other Sci
Sci Advisor
P: 1,341
On the subject of a charged rod deflecting a stream of liquid, see the following PF thread:

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.

Register to reply

Related Discussions
Using quantum mechanical forces in Newtonian molecular dynamics Classical Physics 0
How do i determine the inter and intra molecular forces of these molecules? Biology, Chemistry & Other Homework 0
Liquid Chlorine-Inter and Intra Molecular Forces Biology, Chemistry & Other Homework 4
Capillary forces, intermolecular forces and surface tension questions Classical Physics 2
Questions about molecular forces and shapes Chemistry 1