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There is a type of forces, although they are not true blogs, interact one to another molecule to produce an attractive force between them. These forces are known as intermolecular forces and are: hydrogen bonding and Van der Waals forces. Hydrogen bond



This type of forces present in compounds containing covalent bonds between hydrogen and a very electronegative atom, such as fluoride (HF), oxygen (HO) or nitrogen (HN, creating a dipole dipole attraction very strong. This type of binding occurs when a hydrogen atom from a molecule is attracted to a negative charge center of another molecule.
The attraction molecular hydrogen bridge can occur between the same or between different molecules. It is noted with a dotted line (.....) as shown in the example, (which the teacher presented in class.)
compounds whose molecules exhibit hydrogen bonding attraction have higher boiling points compared to analogous compounds of elements of the same group.
Examples: water boiling point 100 degrees Celsius.

Van der Waals forces
These are purely electrostatic forces. That is, they occur as a result of the attraction between opposite electrical load centers, very close together.
in the case of polar molecules, it is easy to understand the attraction between the positively charged (& positive) and the partial negative & negative). However, there are polar molecules, or which, when approaching each other, by the action of an external agent, such as temperature, induced dipoles are formed. With that also appear Van der Waals forces.