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
Answers
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.
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.
Explanation: