In general, the polar bond is stronger than the covalent bond from which it derives. Pollution Pollution is an undesirable change in the physical, chemical, or biological characteristics of the natural environment, brought about by man's activities. Pollution can occur in the air or in water. Air Pollution Water Pollution Polyhydric Alcohol Polyhydric alcohols contain several hydroxyl groups in the molecule and are normally obtained by the reduction of sugars. For example, sorbital is obtained by the reduction of glucose.
Polymerization is the process by which many small molecules join together to form large molecules.
There are two general methods for preparing polymers, which involves the linking of small molecules together to form long chain molecules. In general, addition polymerisations tend to proceed by a Free Radical Mechanism , while condensation polymerisation tends to proceed by an ionic mechanism. The high pressure gas phase polymerisation of ethene to form Polythene involves a free radical mechanism. The potential energy is the energy possessed by a body due to its position. The potential energy varies when a body moves from one position to another.