With a molecular mass of 18, water has unusual properties for a molecule of its size. It is a polar molecule with a small positive charge at one end and a small negative charge at the other. The oxygen molecule has a negative charge and attracts the positively charged hydrogen atoms of other water molecules, with the result that hydrogen bonds are formed between the water molecules holding them together. Water is not the only substance capable of the phenomenon of hydrogen bonding. The substances ammonia, hydrogen fluoride, and alcohol also.
Water is the major part of all living things.
Water makes up 50 to 90 percent of the weight of all living things. The blood in our bodies and the sap in plants are largely made up of Water is also needed in the metabolic breakdown of proteins and carbohydrates. This process of the breaking down of proteins and carbohydrates is called hydrolysis continually goes on and on in living cells. Another big reason why water is rny favorite compound is that it recycles itself over and over again, just as my favorite element, oxygen, does. This hydrologic cycle starts off when water from the oceans, rivers, soil, and vegetation evaporate into the air.