Each water molecule is joined to _____ other water molecules by ____ bonds.
A) three … ionic
B) two … polar covalent
C) four … polar covalent
D) four … hydrogen
E) two … hydrogen
The correct answer is option D.
Each water molecule is joined to four other molecules by hydrogen bonds.
Water has many extraordinary properties. It requires a lot of heat energy to convert from one sate to another. It requires a lot of heat energy to evaporate, to change from liquid state to gas. It is because the water molecules are polar and they are stick together by hydrogen bonds.
Water is the most critical hydrogen-bonded substance. Hydrogen-bond is formed when the hydrogen atom of one water molecule is attracted towards the oxygen atom of the other water molecule. Here, a proton is shared by two lone electron pairs.
The hydrogen atoms of the water molecule are not only covalently attached to their oxygen atoms but also attracted towards other the oxygen atoms of the nearby water molecules. This attraction is the basis of the ‘hydrogen’ bonding in water.
Each water molecule produces two hydrogen bonds by involving their hydrogen atoms with two further hydrogen bonds by using the hydrogen atoms attached to neighbouring water molecules. These four hydrogen bonds arrange themselves tetrahedral around each water molecule such as found in ordinary ice.