Chemistry cbse class 8

 

why are some fibres called synthetic?

Some fibres are called synthetic fibers because these are manmade fibers prepared by using chemicals. These are made of small units that join together to form long chains. Some of the examples of synthetic fibres are nylon, rayon, acrylic, polyester, etc.

Which indicate that nylon fibres are very strong?

Following are the examples that indicate nylon fibres are very strong

• Parachutes and ropes of rock climbing are made of nylon
• Nylon is used in making seat belts, fishing nets and tyre cords.
• Nylon is used in making sports accessories like rackets.

Why are plastic containers favored for storing food?

Because plastic is non-reactive and will not react with the ingredients of the food items.

How to show that plastics are non-corrosive in nature?

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