Cohesion refers to the intermolecular force of attraction between two similar atoms and adhesion is the bond formation between two different types of molecules. The cohesive property of water includes its ability to form internal bonds between the two hydrogen atoms and between two water molecules. The formation of the water droplet is due to the cohesive property and the formation of oxides and other compounds with water includes the adhesive property. Both properties are equally important. The adhesion helps in the clinging of other types of molecules by its surface while the cohesive property is important to keep its native structure intact. The cohesive and adhesive properties of the water affect the living beings in many ways like adherence of the water droplets to the leaf surface and its slow absorption. The capillary action of blood owes to the adhesive property and the transportation of water by xylem in plants.
In a water molecule, there are two hydrogen bonds formed between the two hydrogen atoms. The hydrogen bonds are the electrostatic force of attractions. These bonds are weaker than the ionic bonds or the covalent bonds. Each water molecule has hydrogen bonds with three other water molecules, since these bonds are weak in nature, they break and reform with other molecules. Mechanism of water adhesion: The water molecule has two hydrogen atoms bonded with one oxygen atom. The hydrogen is positively charged and has one atom each, while the oxygen is negatively charged and has 8 atoms, where 2 are shared with hydrogen atoms, and the other 6 negatively charged atoms are arranged around the molecules. Since the negatively charged free atoms are exposed out, the positively charged hydrogen atom of another water molecule gets attracted to the negatively charged electrons of the oxygen and forms a bond. The exposure of the negatively charged electrons out which helps water to adhere to other types of molecules.
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