How do van der Waals hold molecules together?
Van der Waals forces are usually considered to include
- dipole - dipole interactions
- dipole- induced dipole interactions
- instantaneous dipole - induced dipole interactions (London dispersion forces)
These are electrostatic in nature, and cause an attraction between molecules
Are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bridges between molecules?
Within the molecule it is the covalent bonds which hold the atoms together. The facts that the molecule is polar or that the substance is in the solid state are irrelevant. If you were trying to ask what holds the molecules together to make the solid, then it is dipole-dipole forces and van der Waals forces.
Why are the forces that hold atoms together in molecules stronger than the forces that hold the molecules together in a gas?
Molecules are two or more atoms held together by a covalent bond. This is a very strong bond as it is held together by strong electrostatic charges. All covalent molecules (apart from those held together in a covalent lattice such as Diamond) are bonded to other molecules by Van der Waal forces. Its is these intermolecular bonds that control boiling and melting points. Van der Waals are (in this case) the attractive force between molecules…
Ionic bonds are much stronger than van der Waals forces, which involve temporary sharing of electrons among molecules in a fashion more closely analogous to covalent bonding than to ionic bonding. In normal covalent bonding, however, the electron sharing is permanent until the molecules undergo a chemical change, so that normal covalent bonds are still stronger than van der Waals forces. The main effect of van der Waals forces is to promote condensation and solidification…
Van der Waals forces are the weakest intermolecular force recognized. They attract molecules one another due to temporary dipoles. As an example, the three constitutional isomers of pentane have three slightly different melting points and boiling points due the difference in magnitude of the Van der Waals forces.
First off, we should know what each one is; Covalent bonds are chemical bonds Ionic Bonds are electrical attraction between two oppositely charged atoms or groups Van Der Waals Forces are attractions between the molecules and hold them together So, lets compare them, shall we?Well, we can tell that they are all bonds of some kind or another. And they all have forces attracting them to something else.
Van der waals force is a form of weak interaction between molecules. Van der Waals forces are usually considered to include dipole - dipole interactions dipole- induced dipole interactions instantaneous dipole - induced dipole interactions (London dispersion forces) These are electrostatic in nature, and cause an attraction between molecules To understand dispersion forces, at any given time there will be more electrons on one side of an atom (or on one side of a bond)…