Lecture 3 : Revision

 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