SYNTHETIC FIBRES AND PLASTICS

 Explain Biodegradable plastics

what are Thermoplastics ?

Effect of plastic on Environment.

 What is Biodegradable and Non-Biodegradable substances ?

Plastics as a material of choice.

Reactivity of plastics

Physical properties of plastics

Describe Conductivity of plastics

Define Thermoplastics and thermosetting plastics

Definition of plastic

What is Polyester and acrylic

Define Nylon and its properties

Describe Rayon and its properties

Write an activity to show that synthetic fibres are stronger than
the cotton fibres.

Despite being very useful it is advised to restrict the use of plastic.
Why is it so? Can you suggest some methods to limit its
consumption?

Write the importance of synthetic polymers in our life.

Indicate whether the following statements are True or False. Also
write the false statements in their correct form.
(i) The fabric terywool is obtained by mixing terylene and wool.
(ii) Synthetic fibres do not melt on heating.
(iii) It is risky to wear synthetic clothes while working in the
kitchen.
(iv) Most of the plastics are biodegradable.

Unscramble the jumbled words given below, related to synthetic
materials.
(a) anory                     (b) lopmery
(c) relyteen                  (d) laspict
(e) yespolter                  (f) felton

Match items in List A with the items of list B.
List A List B
(a) nylon (i) non-stick coating
(b) PET (ii) electric switches
(c) rayon (iii) parachutes
(d) thermosetting plastics (iv) polyester
(e) teflon (v) artificial silk

Fill in the blanks.
(i) A polymer is a chain of many small units joined together
which are called ______.
(ii) The synthetic fibres are also known as ______ fibres.
(iii) The first fully synthetic fibre was ______.
(iv) A fibre similar to wool is ______.
(v) A plastic used for making crockery is ______.

PVC (polyvinyl chloride) is a thermoplastic and is used for making
toys, chappals, etc. Bakelite is a thermosetting plastic and is
used for making electrical switches, handles of various utensils,
etc. Can you write the major difference between these two types
of plastics?

A lady went to the market to buy a blanket. The shopkeeper
showed her blankets made of acrylic fibres as well as made of
wool. She preferred to buy an acrylic blanket. Can you guess why?

Rohit took with him some nylon ropes, when he was going for
rock climbing. Can you tell why he selected nylon ropes instead
of ropes made of cotton or jute?

bucket made of plastic does not rust like a bucket made of
iron. Why?

Select the articles from the following list which are biodegradable.
(a) paper                                              (c) wood
(b) woolen clothes                                 (d) aluminium can
(e) plastic bag                                       (f) peels of vegetables

Why is it not advisable to burn plastic and synthetic fabrics?

Plastic is used for making a large variety of articles of daily use
and these articles are very attractive. But it is advised to avoid
the use of plastic as far as possible. Why?

A synthetic fibre which looks like silk is obtained by chemical
treatment of wood pulp. It is, therefore, known as artificial silk.
What is its common name?

Cotton is a natural polymer. What is its chemical name?

Describe an activity to show that thermoplastic is a poor conductor of electricity.

Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.

 Match the terms of column A correctly with the phrases given in column B.

'Avoid plastics as far as possible'. Comment on this advice.

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Give examples to show that plastics are non-corrosive in nature.

Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.

Categorize the materials of the following products into 'can be recycled' and 'cannot be recycled'.
Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.

Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards

Explain the difference between thermoplastic and thermosetting plastics.

Explain why plastic containers are favoured for storing food.

Give examples which indicate that nylon fibres are very strong.

 Fill in the blanks with appropriate words.
(a) Synthetic fibres are also called ________or _________fibres.
(b) Synthetic fibres are synthesised from raw materials called ________.
(c) Like synthetic fibres, plastic is also a _________.

Rayon is different from synthetic fibres because
(a) it has a silk-like appearance.
(b) it is obtained from wood pulp.
(c) its fibres can also be woven like those of natural fibres..

Explain why some fibres are called synthetic.