Define seedling??
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Answers
Answer:
The process of formation of molecules of polymers bye the combination of small unit molecules, is called polymerisation
Polymers are large molecules, consisting of a large number of small units called monomers e.g. when Ethylene is heated at high temperature and high pressure, its molecules unite together to form a high molecular weight compound called Polythene. This process is called Polymerisation.
n(CH
2
=CH
2
)
Polymerisation
Hightemperatureandhighpressure
Polythene
(−CH
2
−CH
2
−)
n
where n is the number of molecules.
In the same way, Polyvinyl Chloride (P.V.C.), Teflon, Neoprin etc. are also polymers.
Some important polymers, their method of preparation, properties and uses -
1. Polythese (Poly + Ethene = Polythene) It is a synthetic polymer of the additional series.
It's monomer unit is ethylene.
n(CH
2
=CH
2
)
Polymerisation
1000−200A.P.
Polythene
(−CH
2
−CH
2
−)
n
Property - It is transparent, elastic, strong, and solid plastic.
use - It is used in making raincoats, toys, pipes, bags etc.
2.Polyvinyl Chloride (P.V.C.) - It is also synthetic polymer of additional series. It's monomer unit is Vinyl chloride.
(VinylChloride)
CH
2
=CH.Cl
⟶
PolyVinylChloride
−CH
2
cl
∣
CH
Properties - It is a hard polymer.
Uses - It is used in making floor tiles, pipes, toys etc.\
Tetra∗∗FluroEthnene
n(CF
2
=CF
2
)
⟶
Teflon
(−CF
2
−CF
2
−)
n
Properties - It is a hard and heat resistant substance.
Uses - It is used in making non stick utensils.
Explanation:
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Answer:
The term seeding and related terms such as seeded are used in many different several contexts: Sowing, planting seeds in a place or on an object. Cloud seeding, manipulating cloud formations. ... A seeding machine, a mechanical device often used in agricultural work.