Dental Extraction Forcep Chart

The hydrogen bond is a bond that exists between molecules capable of generating partial loads. Water is the substance in which hydrogen bonds are more effective in its molecule, the electrons involved in their blogs, are closer to the oxygen of the hydrogen and thus generates two negative partial charges at the end where is the oxygen and two partial positive charges at the end where the hydrogens. The presence of positive and negative partial charges causes water molecules to behave as magnets in which parties with partial positive charge attracts the negative partial charges parties. In such a way that a single water molecule can bind to other 4 water molecules through hydrogen bonds 4. This characteristic is what makes water special liquid.

hydrogen bonds are formed by hydrogen atoms located between electronegative atoms. When a hydrogen atom is bonded covalently , an electronegative atom, eg . oxygen or nitrogen, assuming a density ( d) positively charged due to the high electronegativity of the neighboring atom. This partial deficiency of electrons, causes the hydrogen atoms capable of attraction by the unshared electrons on oxygen or nitrogen atoms

Note the settings Electronic Oxygen

₈ ^{O 1s 2 2s 2} 2px ^ê é p ^{é pz é}

of Hence :

d + d +

d -

+ d + d

d -

Figure: electron configuration of oxygen

the hydrogen bond is relatively weak between -20 and -30 kJ mol -1 , bond strength increases with increasing electronegativity and decreases with the size of atoms participants. Therefore, hydrogen bonding exists in many molecules not only in water. This deal only with regard to the water.

promotes water structure interactions to form hydrogen bonds is always perpendicular arrangement between the molecules involved, is also favored that each proton attached to a very electronegative Oxygen is an unshared electron that interacts with one by one. It is confirmed that each atom d oxygen in the water interacts with 4 protons, two of them together and two covalently through hydrogen bonds.

collinear

Figure: Information on hydrogen bridges

Studies X-ray diffraction indicate that the distance between oxygen atoms involved in hydrogen bonds are separated by 0.28 nm indicating a tetrahedral arrangement of water molecules also hydrogen bonds:

TETRAHEDRO

Figure: A representation of a tetrahedral molecule of water.

The collinearity of the bridges is very important, a distance of 10 ° causes the bridge to break.

linnus Pauling postulated from observations of molecular transitions (ie the motion of atoms with respect to those who are attached) of the participating atoms in the molecule D 2 O (deuterium is part of the constellation of hydrogen), the hydrogen bond interaction is more important than playing a critical role not only in the structure of water but in the structure and function of biological macromolecules.