Covalent bonding, like ionic bonding, is a term describing the linking between two adjacent atoms. It does not have a goal or purpose. The concept explains the chemical behavior of molecules very well, especially in organic materials.
There isn't much of a purpose it is more like rules of nature. We humans didn't say wouldn't it be cool if baking soda and vinegar reacted together and then made it so. They just react to each other, we discovered this and found ways to make it useful. I am not sure why nature reacts the way it does, what the purpose is, but when we humans expose chemicals to each other to induce a reaction it is because we need what ever by product comes from said reaction to do something "useful". Almost all chemical reactions were/are found by trial and error over hundreds of years of experimentation.
The goal of every atom during a chemical reaction is to become stable, which means they react in such a way as to gain a complete valence shell, usually with eight electrons, except for hydrogen which needs two electrons, either by the sharing of electrons through the formation of covalent bonds, or by forming ionic bonds.
The goal of a chemical bond is to create a molecule.
By chemical bonding, atoms release energy and become relatively stable than existing as individual atoms.
Each atom wants to follow the octet rule and have eight electrons in the valence shell. By bonding with other atoms they can share electrons so each has eight.
There is no point to chemistry.
To understand the behavior of matter.
In chemistry, the purpose would be "to represent the space lone pairs occupy in a molecule.
What would you do if you spilled very hot water or acid on your toes.
solubility it important to understanding chemistry
The principal purpose is to evaluate the chemical composition of cosmic objects.
To make sure whatever you are heating doesnt get above the temperature of steam (~100 degrees C).
Principally, the chemistry of life is the chemistry of carbon.
The purpose of microfluidics is to control and manipulate fluids on a small scale. It is most commonly used in the fields of engineering, physics and chemistry.
The purpose is to understand the chemistry of life.
In chemistry, the purpose would be "to represent the space lone pairs occupy in a molecule.
The purpose was the study of the atmosphere composition.
The purpose is to obtain a statistical representative sample from the material to be tested.
Nuclear wastes are treated with chemical products with the purpose of obtaining an insoluble material.
What would you do if you spilled very hot water or acid on your toes.
solubility it important to understanding chemistry
Chemistry is about as pure a definition of science as could be found; it is sometimes mislabelled under technology, although technology is the application of science to a worldly purpose, not the science itself.
The principal purpose is to evaluate the chemical composition of cosmic objects.
Yes you can, but be careful about upsetting the chemistry of the recipe.