One molecule we interact with every day, is a water molecule. How we interact with it everyday is because we need to wash our hands, drink water, and more. The molecular composition of water ( H2O) is, two hydrogen atoms, which is both linked by a single chemical bond to an oxygen atom. Water also has properties, the 5 main properties of water is, its attraction to polar molecules, high specific heat, high heat to vaporization, the lower density of ice, and high polarity. We all know water is very important to the earth because, water is one of the most important substances to our planet. This includes more living things, not just humans. All plants and animals must have water to survive. If there was no water, there would be no life for us on earth.