Semiochemicals are the organic compounds used by insects to carry informations. The oils and fats contain unsaturated and saturated fatty acids. Preparation of ornaments, jewels, ornamental gold and artificial gold involves the application of chemistry.

Cement, cement products and setting involve chemical phenomena. Iron, steel utensils, alloys, ceramic products, nanoparticles and composites contain elements and compounds in different proportions. Natural rubber is a polymer of isoprene. Tyres, synthetic rubbers, rubber products like gloves, apron and vulcanization involve chemical substances and chemical phenomena. Cotton, synthetic fibers like terylene, rayon and nylon are chemical compounds.

Hippocrates, a Greek physician proclaimed 2500 years ago let food be thy medicine and medicine be thy food. The major cause of diseases is due to chemical adulterants, colourants, pesticides, preservatives and intake of junk foods. So almost all our daily usable compounds are made from either the 118 elements or their compounds. Altogether chemistry laid its foot mark in each and every aspect of our life mingled with us and we cannot live without chemistry. The consequences of using these without knowing their effect whether short term or long term will spoil our biology.