Water 's presence in the Living World
             Water is essential in the living world, it is the main component in glacier, sea and present predominantly in living cells. Water is used for drinking, washing and irrigating crops and watering livestock. It also acts as a thermal regulator by smoothing out sudden and large temperature variations in the environment.
             Water is made of H2O, it can be separated through electrolysis. Hydrogen is present in the cathode, it has twice the volume of Oxygen in anode, and Hydrogen burns furiously and explodingly in the pop test, Oxygen supports burning in the splint test.
             Water molecules have strong intermolecular force
             Water is a polar molecular. When Ebonite and Perspex are charged, stream of tap water is attracted to them, water attracts both positive and negative static charged materials. That shows
             the hydrogen electrons are delocalised and its electron pairs are unevenly shared in the covalent bonding. The bond between water molecules is hydrogen bond, which is caused by attraction of pairs of electropositive hydrogen atom with electrons of oxygen atoms in another molecule.
             Ionic substances such as NaCl is dissolved in water, polar water molecules have a strong attraction for charged ions, this result ions in NaCl to move freely in water in aqueous state.
             Water has high surface tension, the liquid has great tendency to form a spherical drop rather than spread out, this property of allow ship transport on water possible.
             Water molecules are formed through polar interactions, water attract other hydrogen bonds between water molecules. This results water to have strong intermolecular force and high surface tension.
             Water is the only substance that can exist in the three states(Ice solid, vapour, liquid) under normal range of environmental conditions. Comparing to other covalent molecules such
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