Science, asked by rkjithanya, 10 months ago

1) Name any two natural polymers.
2) Name any two synthetic polymers.
3) Name the plastics used for making water pipes.
4) Name any two polyester fibres.
5) Name the plastic which is used for Non-stick coating.
6) What do you mean by 4-R principal.
7) Differentiate between Biodegradable and Non-Biodegradable substances.
8) Explain why storage of Acrylic needs no special care unlike woolen clothes.
9) Why it is not advisable to wear clothes made up of synthetic fibres while working near fire?

Answers

Answered by siya20062020
4

1. Silk, wool

2. Plastic and synthetic fibres

3. PVC

4. Terelyene, terecyott

5. PTFE

6.

7. Biodegradable substances are those that degrades or break down naturally. Non-biodegradable substances are those that do not degrade easily. These terms itself defines the ability of the substances which are degradable or not. Materials like plants, animals, their waste, paper, fruits, flowers, vegetables fall under biodegradable substances, on the other hand, rubber, plastic, chemicals, paint plastic falls under the category of the non-biodegradable items.

The environment in which we live is surrounded by these two things only, even the materials we use in day to day life can be biodegradable or non-biodegradable. It is usually seen that non-biodegradable substances are synthesized and does not occur naturally, hence their degradation is also not possible, but the biodegradable substances get easily decompose in nature through agents like water, soil, sunlight, microorganisms, etc. and directly or indirectly are profitable to the environment.

In the given content we will be focussing on the fundamental differences between the biodegradable and non-biodegradable substances with the brief description of them.

7.

Answered by PraptiMishra05
6

Ans 1 :- silk, wool.

Ans 2 :- Nylon,Tylon

Ans 3 :- PVC (Poly vinly chloride)

Ans 4 :- Pillows , comforters.

Ans 5 :- PTFE (Polytetrafluoroethylene) 

Ans 6 :- 4R principal means: Reduse ,Reuse, Recycle And Recover.

Ans 7 :- Bio degradable waste :-

1. The wastes decompose naturally in the environment.

2. They are safe for the environment.

3. The wastes are made up of natural ingredients.

4. They can be constantly reused.

5.Biodegradable substances persist for small time interval  in the environment.

6. Example – waste papers, wood crumbles.

Non bio degradable waste :-

1. The wastes do not decompose naturally.

2. They are harmful to the environment and create pollution

3. The wastes are made up of synthetic materials.

4. They cannot be recycled.

5. Non biodegradable substances persist for longer time in the environment.

6. Example – plastic bags, cans, disposable bottles.

Ans 8 :- Synthetic fibres are moth resistant,does not get damaged easily,tough etc. Acrylic, also called as artificial wool, is a snythetic fibre .Therefore storage of acrylic doesnt need any special care.

Ans 9 :- Synthetic fibre like  catches fire very easily and melts. After melting It sticks to the body of the person wearing it causing very harmful  burns. Hence it is advised not to wear synthetic fibre while working near fire.

Hope it helps

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