Van Der Waals Forces: Explaining Role in Molecule Properties

In summary, van der Waals forces are important in predicting properties of molecules because they play a significant role in adhesion and determine the distance between nearby molecules through attractive and repulsive forces. These forces were also crucial in the discovery of DNA's structure by Watson and Crick. A basic understanding of van der Waals forces is necessary for solving various questions related to them.
  • #1
pink_ele
17
0
please explain me importance n role of vanderwaals forces in predicting properties of any molecule
 
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  • #2
Is this a homework question? If so, then you should show some work, or some effort before we can help you. For example, what do you know about van der Waal's forces?
 
  • #3
i know just this much about van der waals forces-
It is important to remember that van der Waals' forces are forces that exist between MOLECULES of the same substance Van der Waals forces act only over relatively short distances, and are proportional to the inverse of the seventh power of the intermolecular distances. The forces are important in the mechanics of ADHESION

is this much knowledge about it is ufficient for solving various questions based on it.
 
  • #4
they use both attractive & repulsive forces to dictate how close molecules can be if they are nearby... they were one of the primary methods Watson and Crick used to deduce the structure of DNA! I'd say that's an important role.
 

1. What are Van Der Waals forces?

Van Der Waals forces, also known as London dispersion forces, are weak intermolecular forces that occur between non-polar molecules. These forces are caused by temporary dipoles that are created due to the uneven distribution of electrons within a molecule.

2. How do Van Der Waals forces affect molecule properties?

Van Der Waals forces play a crucial role in determining the physical properties of a molecule, such as boiling point, melting point, and viscosity. These forces also contribute to the strength of intermolecular interactions and can affect the solubility and volatility of a substance.

3. How are Van Der Waals forces different from other intermolecular forces?

Van Der Waals forces are different from other intermolecular forces, such as hydrogen bonding and dipole-dipole interactions, in terms of strength. Van Der Waals forces are much weaker than other forces, making them less significant in determining the properties of molecules. However, they still play a crucial role in stabilizing non-polar molecules.

4. Can Van Der Waals forces be observed in everyday life?

Yes, Van Der Waals forces can be observed in everyday life. These forces are responsible for the adhesion of gecko feet to surfaces, as well as the cohesion of water molecules in a glass. They also contribute to the surface tension of liquids and the stickiness of certain substances.

5. How can the strength of Van Der Waals forces be increased?

The strength of Van Der Waals forces can be increased by increasing the surface area of a molecule. This allows for more contact points between molecules, leading to stronger intermolecular interactions. Additionally, increasing the number of electrons in a molecule can also increase the strength of Van Der Waals forces.

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