Soul of Chemistry

Notes on Polymer Chemistry for BSc Honours Introduction: The word polymer comes from the greek words 'poly' meaning many and 'meros' meaning parts. Thus a polymer is a large molecule made up of smaller units called monomers that are chemically linked together. n CH 2 =CH 2  ----------> -(CH 2 -CH 2 )- n       These polymers can found in nature or can be synthetically prepared or man-made. Some examples of natural polymers are DNA, Proteins, polysaccharides, cellulose, polypeptide and natural rubber. Similarly some examples of man made polymers include polythene, PVC, Polyamides, Nylon etc. Difference between polymers and macromolecules: We have already defined polymers which necessarily contain repeating monomer units. For example: Polythene contains the repeating unit of ethene monomer unit.     M acromolecules have a bigger molecular structure and higher molecular weight but have no repeating units. For example: fat molecules contain glycerol and dif...

  Most important 100 points on periodic table Find here most important 100 short questions on periodic table: 1.        The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. 2.        It was first proposed by Russian chemist Dmitri Mendeleev in 1869. 3.        The modern periodic table consists of 118 elements, including 94 naturally occurring elements and 24 synthetic elements. 4.        Elements are arranged in order of increasing atomic number from left to right and top to bottom. 5.        Each element is represented by its chemical symbol, which is derived from its name. 6.        Elements in the same vertical column are called groups or families and have similar chemical propert...