this are some science questions. solve this
Answers
Answer:
Dear Mate !
Explanation:
1.Ans - Some fibers are called synthetic because they are man-made and made by people by using some chemicals. In these fibers small units are there which by joining together forms a long chain. There are some fibres that are prepared by man by using chemicals. These are called synthetic fibres
2.Ans - Rayon is different from synthetic fibres because:
It has a silk like appearance. It is obtained from wood pulp. Its fibres can also be woven like those of natural fibres.
3.Ans - Synthetic fibres are also called man-made or artificial fibres.
4.Ans - Nylon fibres are very strong. It is used for making ropes, used for climbing rocks and for making parachutes. Their usage shows that nylon fibres have high tensile strength.
5.Ans - Plastic containers seem more convenient than metal containers. This is because of their light weight, lower price, good strength and easy handling.
6.Ans - Thermoplastic polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. Hence, they can be modified again and again. Examples include polythene, polystyrene.
Thermosetting polymers are cross-linked or heavily branched polymers which get hardened during the molding process. These plastics cannot be softened again on heating. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins.
10.Ans - Plastics are non-corrosive in nature, they do not react even if they come in contact with strong chemicals. For example, the cleaning chemicals that we use at home are stored in plastic bottles, instead of metal containers.
12.Ans - Avoid the use of plastics as far as possible. Plastics are non-biodegradable materials. So use of plastics is harmful for our environment.
Sorry for not answering 7th,8th,9th,11th questions.Because I don't know that questions Mate.So that.
Hope this answer helps you.
Please mark this answer as brainliest answer.