What is van der waal forces?

Question

What are van der waal forces?

Answer 1

They are forces that make one molecule stick to another if there is no other stronger force (such as a difference in charges) that causes them to stick. They are caused by short lived uneven distribution of electrons around one molecule inducing a corresponding opposite distribution in the other molecule and then the opposite charges attract.

Answer 2

Define Van Der Waals Forces

Answer 3

In chemistry, the term Van der Waals force refers to a particular class of intermolecular forces. The term originally referred to all such forces, and this usage is still sometimes observed, but it is now more commonly used to refer to those forces which arise from the polarization of molecules into dipoles. This includes forces that arise from fixed or angle-averaged dipoles (Keesom forces) and free or rotation dipoles (Debye forces) as well as shifts in electron cloud distribution (London forces). The name refers to the Dutch physicist and chemist Johannes Diderik van der Waals, who first documented these types of forces. The Lennard-Jones potential is often used as an approximate model for the Van der Waals force as a function of distance.

Van der Waals interactions are observed in noble gases, which are very stable and tend not to interact. This is why it is difficult to condense them into liquids. However, the larger the atom of the noble gas (the more electrons it has) the easier it is to condense the gas into a liquid. This happens because, when the electron cloud surrounding the gas atom gets large, it does not form a perfect sphere around the nucleus. Rather, it is only spherical if averaged over longer times and generally forms an ellipsoid, which has a slight negative charge on one side of the major axis and a slight positive charge on the other. The atom becomes a temporary dipole. This induces the same shift in neighboring atoms and spreads from one atom to the next. Unlike charges attract, and the induced dipoles are held together by dispersion force (or Van der Waals force). Van der Waals forces are responsible for certain cases of pressure broadening (Van der Waals broadening) of spectral lines.

Answer 4

Van der Waals' forces (London forces) are weak intermolecular interactions which result when a molecule or group of molecules become polarized to a magnetic dipole. Hope this helped :)

Answer 5

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What is van der waal forces?
What are van der waal forces?

Answer 6

Van der waal forces is a weak attractive force between atoms or nonpolar molecules caused by a temporary change in dipole moment arising from a brief shift of orbital electrons to one side of one atom or molecule, creating a similar shift in adjacent atoms or molecules.

Answer 7

We all know that opposite charges attract, right? Well, that's all van der Waals are. In a molecule without any real net polarity, the electron density will sometimes shift to one side. When this happens it will slightly expose the proton. This creates a small dipole in the molecule that will have a similar effect on other, near-by molecules - the slightly exposed proton will attract electrons from the molecule next to it. These effects are very short lived and weakly interacting.

Answer 8

Van Der Waals Forces: weak charge-charge attractions or repulsions between molecules (intermolecular) or molecules in close proximity. Such forces are the result of temporary transient dipoles on molecules leading to localised charge fluctuations.

Answer 9

Vanderwaals forces are forces of attraction between two ions of a molecule. they are weak forces than covalent forces of attraction. vanderwaals forces are always formed by pi-bonds.

Answer 10

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