**Correct Option: B. Polyethylene** ### Detailed Explanation Polyethylene is a widely used synthetic polymer that is particularly favored in the production of packaging materials. Here’s a step-by-step breakdown of why polyethylene is the correct answer and why the other options are less suitable: 1. **Properties of Polyethylene**: - **Lightweight**: Polyethylene is known for its low density, which makes it very lightweight. This is a crucial property for packaging materials, as it reduces shipping costs and makes handling easier. - **Durability**: Polyethylene exhibits excellent resistance to impact and moisture, making it suitable for protecting products during storage and transportation. It is also resistant to many chemicals, which adds to its durability. - **Flexibility**: Polyethylene can be produced in various forms, including low-density polyethylene (LDPE) and high-density polyethylene (HDPE), each offering different levels of flexibility and strength. This versatility allows it to be used in a wide range of packaging applications, from plastic bags to rigid containers. 2. **Common Uses**: - Polyethylene is extensively used in the production of plastic bags, films, containers, and bottles. Its ability to be easily molded and formed into various shapes makes it ideal for packaging. 3. **Comparison with Other Options**: - **A. Polystyrene**: While polystyrene is also used in packaging (especially in foam form for protective packaging), it is generally more brittle than polyethylene. This brittleness can lead to breakage under stress, making it less suitable for many applications where durability is required. - **C. Polyvinyl Chloride (PVC)**: PVC is used in a variety of applications, including pipes and vinyl siding, but it is not as commonly used for flexible packaging materials. PVC can be more rigid and less versatile than polyethylene for packaging applications. Additionally, the production and disposal of PVC can raise environmental concerns due to the release of harmful chemicals. - **D. Nylon**: Nylon is a strong and durable synthetic polymer, but it is primarily used in textiles, automotive parts, and industrial applications rather than in packaging. Its higher cost and more complex production process make it less suitable for mass-produced packaging materials compared to polyethylene. ### Summary of Key Points - **Polyethylene** is lightweight, durable, and flexible, making it ideal for packaging materials. - It is widely used in various forms, including bags, films, and containers. - **Polystyrene** is more brittle, **PVC** is less flexible and has environmental concerns, and **Nylon** is not typically used for packaging. - Understanding the properties and applications of different polymers is crucial for selecting the right material for specific uses. ### Revision Summary - Polyethylene is the most common polymer for packaging due to its lightweight and durable nature. - It is versatile and can be produced in different densities for various applications. - Other options like polystyrene, PVC, and nylon have limitations that make them less suitable for packaging. - Familiarity with the properties of synthetic polymers aids in making informed material choices in chemistry and industry.