1.
a) name the process of formation of polymer from its monomer
2.give any two reasons for the following
a) nylon is used in making socks
b)polyester is used for making sails for boats
c) synthetic fibres is uncomfortable during summer
d) terylene clothes should not be worn while working in the kitchen
3) why is bakelite used for making electrical switches
4) why do we use melamine for making kitchenware
5) manufacturing synthetic fibres actually help in conservation of forests . justify this statement
6) Evaluate which is a better fabric - cotton or nylon , rayon or wool in terms of following properties
a) user friendly b) strength c)thermal property d) environment friendly
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Answers
Answer:
ans a)Polymerisation is the process in which polymers are formed from monomers... polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks .
ans 2 a)Nylon is used in making socks because they are elastic and have more strength. And it does not absorb water it absorbs only less water.It is light in weight.It is wrinkle free fabric.It is very easy to wash.So nylon is used in making socks.
ans 2b)Polyester is widelyused for boat lines and for sail material because it combines good strength and durability, relatively low stretch and reasonable prices.
ans 2c)synthetic fibre traps very high amount of heat from sun and therefore it becomes very warm and it makes us feel very hot and uncomfortable during summer.
ans 2D)Synthetic fibres melt on heating. ... That is why it is said not to wear clothes made of synthetic fibre while working in a kitchen as terylene is a synthetic fibre.
ans 2e) Bakelite is used for making electrical switches because it is a poor conductor of heat and electricity
ans 2f)Melamine is a versatile material and it also resits fire. So it is used for making kitchenware. Because melamine is basically a thermosetting plastic which does not melts by fire. Once it is being moulded it cannot be melted again.
Explanation:
Answer:
ans 1)Polymerisation is the process in which polymers are formed from monomers... polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks .
ans 2 a)Nylon is used in making socks because they are elastic and have more strength. And it does not absorb water it absorbs only less water.It is light in weight.It is wrinkle free fabric.It is very easy to wash.So nylon is used in making socks.
ans 2b)Polyester is widelyused for boat lines and for sail material because it combines good strength and durability, relatively low stretch and reasonable prices.
ans 2c)synthetic fibre traps very high amount of heat from sun and therefore it becomes very warm and it makes us feel very hot and uncomfortable during summer.
ans 2d)Synthetic fibres melt on heating. ... That is why it is said not to wear clothes made of synthetic fibre while working in a kitchen as terylene is a synthetic fibre.
ans 3) Bakelite is used for making electrical switches because it is a poor conductor of heat and electricity
ans 4)Melamine is a versatile material and it also resits fire. So it is used for making kitchenware. Because melamine is basically a thermosetting plastic which does not melts by fire. Once it is being moulded it cannot be melted again.
ans 5) As synthetic fibres are obtained from petrochemicals, they have very well substituted the use of natural fibres like cotton, silk, wool and jute which are obtained from plants and animals. ... Therefore, we can say 'Manufacturing of synthetic fibres is actually helping conservation of forests'.
i) Cotton is more user friendly as it is softer and more absorbent.
Rayon is more user friendly than wool as it is lighter, cheaper, has bright sheen, is breathable and easy to maintain.
ii) Nylon is more strong than cotton.
Rayon is stronger than wool.
iii) Cotton and wool are more heat resistant than nylon or rayon. Nylon and rayon can catch fire easily.
iv) Nylon and cotton both are not environment friendly. Nylon is produced from petroleum product, releases toxic gases and is non biodegradable whereas cotton requires a large amount of energy, pesticides and water to produce it. Both are harmful to the nature. Still cotton is produced from a plant and if grown in the right manner can be called as eco-friendlier than nylon.
Rayon requires more energy to grow than wool. It requires a lot of toxic chemicals during processing such as caustic soda, ammonia, carbon disulphde and sulphuric acid.
Explanation:
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