Few questions on molecular forces

  • Thread starter Thread starter asdff529
  • Start date Start date
  • Tags Tags
    Forces Molecular
AI Thread Summary
A liquid composed of non-polar molecules does not exhibit deflection when a charged rod is brought near it, unlike insulators which can become induced and adhere to the charged object. The discussion highlights that polar liquids, such as water, can be deflected by a charged rod due to induced electrical charges. This phenomenon has been documented for over two centuries, with historical references to early observations by Jean Théophile Desaguilers. The mechanism involves charge separation in polar droplets, leading to a net charge that attracts them to the charged object. Additionally, the nature of hydrogen bonds is clarified, noting that while hydrogen bonds occur between hydrogen and electronegative atoms like nitrogen or oxygen, hydrogen chloride (HCl) does not form hydrogen bonds despite nitrogen and chlorine having similar electronegativity values on the Pauling scale. This distinction is crucial for understanding molecular interactions.
asdff529
Messages
38
Reaction score
0
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 I am 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 doesn't have hydrogen bond?
 
Chemistry news on Phys.org
On the subject of a charged rod deflecting a stream of liquid, see the following PF thread:
https://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.
 
It seems like a simple enough question: what is the solubility of epsom salt in water at 20°C? A graph or table showing how it varies with temperature would be a bonus. But upon searching the internet I have been unable to determine this with confidence. Wikipedia gives the value of 113g/100ml. But other sources disagree and I can't find a definitive source for the information. I even asked chatgpt but it couldn't be sure either. I thought, naively, that this would be easy to look up without...
I was introduced to the Octet Rule recently and make me wonder, why does 8 valence electrons or a full p orbital always make an element inert? What is so special with a full p orbital? Like take Calcium for an example, its outer orbital is filled but its only the s orbital thats filled so its still reactive not so much as the Alkaline metals but still pretty reactive. Can someone explain it to me? Thanks!!
Back
Top