Question

Manmade
Natural
Wood
Wooden chair
Comb
Plastic
17.1 Plastic material
Plastic
A manmade material showing the property of
plasticity and made up of organic polymers is plastic.
Structure of all the plastics is not same. Some are
linear while some are circular.
Depending upon the effect of heat, plastic can be
classified into two types. The plastic that can be
molded as per our wish is called as thermoplastic. eg.
Polythene, PVC are used for manufacturing the toys,
combs, plates, bowls etc. Another plastic is such that
once a specific shape is given with the help of mold,
its shape cannot be changed on heating. It is called as
thermosetting plastic, eg. Electric switches, coverings
over the handles of cookers, etc.
Use of Information Technology
Make a collection of various
videos on process of plastic
production. Using those videos,
make a presentation with the help
of your teacher and send it to other
through email and other
applications.​

Answer 1

Answer:

Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt and, of course, crude oil. Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used. The production of plastics begins with the distillation of crude oil in an oil refinery. This separates the heavy crude oil into groups of lighter components, called fractions. Each fraction is a mixture of hydrocarbon chains (chemical compounds made up of carbon and hydrogen), which differ in terms of the size and structure of their molecules. One of these fractions, naphtha, is the crucial compound for the production of plastics.

Explanation: