Hi can you show work and evidence on how you found the answe

Hi can you show work and evidence on how you found the answers? Thank you

Which of the following statements is (are) true for plastics? (Choose all apply) Thermosetting plastics are relatively soft. Thermoplastic materials can be formed repeatedly by heating or molding. Polycarbonate is a type of thermosetting plastics Thermosetting plastics cannot be formed repeated by heating or molding. Acrylonitrile-butadiene styrene is a type of thermoplastic materials

Solution

1. Thermosetting plastics are relatively soft- False

Explanation- Thermosetting Plastics do not become soft on heating & they never melt once set. In other words,It becomes permanently hard and rigid after cooling when heated above the melting temperature.

Example: Bakelite

Uses: Electric switches, Telephone parts, Cooker handles

2.Thermoplastic materials can be formed repeatedly by heating or molding- True

Explanation: The material that softens when heated above the glass transition temperature or melting temperature and becomes hard after cooling is called thermoplastics materials. Thermoplastics can be reversibly melted by heating and solidified by cooling in limited number of cycles without affecting the mechanical properties.

Thermoplastics soften when heated and subsequently melt. When cooled they become hard and rigid once again.

Example: Polyethylene, PVC, Nylon

Uses: Bags, Mugs, Toys

3. Polycarbonate is a type of thermosetting plastics- False

Explanation- Polycarbonate is a polymer containing carbonate group in the chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent.

4. Thermosetting plastics cannot be formed repeatedely by heating or molding- True

Explanation- Thermosetting plastics do not become soft on heating & they never melt once set.

5.Acrylonitrile-butadiene styrene is a type of thermoplastic materials- True

Explanation- Acrylonitrile-butadiene styrene  (chemical formula (C₈H₈)_x·(C₄H₆)_y·(C₃H₃N)_z) is a common thermoplastic polymer.