What molecule has a polar covalent bond?

What type of chemcial bond occurs between the positively charged end of one polar covalent molecule and the negatively chged end of anothor polar covalent molecule?

• Answer:

  Bonds that occur between covalently bonded molecules are known as hydrogen bonds. Hydrogen bonds are so named for the fact that these bonds almost always involve hydrogen. Water is a good example of hydrogen bonding. The slightly positive hydrogen ends of water molecules are attracted to the slightly negative oxygen ends. This attraction pulls water molecules very close together. It is the reason that liquid water is more dense than solid water (ice), wherein the molecules are fixed in a crystalline formation, and cannot undergo hydrogen bonding.