11.1 Fossil Fuel
The ruins of plant and animals of ancient periods which are found underground are called fossil fuels.
11.2 Hydrocarbons
11.3 Saturated Hydrocarbons: Alkanes
11.4 Unsaturated Hydrocarbons: Alkenes and Alkynes
11.5 Alcohols, Aldehydes and Fatty Acids
11.6 The Uses of Alcohol, Aldehydes and Organic Acids
11.7 Polymers
Polymerization Reaction: The reaction in which innumerable tiny molecules of any substances are attached with each other and form a large molecule is called a polymerization reaction.
Monomer:
Polymer molecule:
Dimer:When two molecules joins each other, it is called a dimer.
Trimer: When three monomers join one another, it is called a trimer.
Types of Polymers
Polymers can be classified in many ways. However, according to their structure, polymers are of two kinds, such as-
i) Addition Polymer and ii) Condensation Polymer.
i) Addition Polymer
The polymer which is formed in a addition polymerization reaction is called an addition polymer.
Addition Polymerization Reaction
The polymerization reaction in which the monomer molecules are directly connected to one another and form a long-chained polymer is called an addition polymerization reaction.
Preparation of polythene
When ethene is heated in the presence of little amount of oxygen at 1000 atmosphere pressure and 200℃ temperature is applied then polythene is produced.
