1.

True or False:1.Sodium is used in vulcanization of rubber. 2.Most of the tallest freestanding structures in the world are made of metals or the alloy of iron .3. Metals react with water to produce metal oxide and evolve hydrogen gas. 4.Acrylic is used as a substitute for silk. 5.Nylon is obtained from coal and petroleum​

Answer»

1. False ,

Vulcanization is a chemical process that converts natural rubber and other polydiene elastomers into cross-linked polymers. The most common vulcanization agent is sulfur.

It forms BRIDGES between individual polymer molecules when heated with rubber.

2. True ,

3. True ,

Metals react with water and produce a metal oxide and hydrogen gas. Metal oxides that are soluble in water dissolve in it to further form metal hydroxide. But all metals do not react with water.

4. True ,

Because acrylic is used many purpose and it is better than silk.

5. True ,

Unlike traditional materials such as wood, IRON, WOOL, and cotton, nylon does not exist in nature: we have to MAKE it in chemical plants from organic (carbon-based) chemicals found in natural materials such as COAL or petroleum.



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