The correct option for the synthetic polymer commonly used in the production of plastic bottles and containers due to its excellent chemical resistance and durability is **B. Polyethylene terephthalate (PET)**. ### Detailed Explanation 1. **Understanding the Options**: - **A. Polystyrene**: This polymer is often used in packaging materials, disposable cutlery, and insulation. While it has some chemical resistance, it is not as durable or resistant to heat and chemicals as PET. It is also more brittle, which makes it less suitable for containers that need to withstand pressure or impact. - **B. Polyethylene terephthalate (PET)**: PET is a thermoplastic polymer that is widely used for making bottles and containers, especially for beverages. It is known for its excellent chemical resistance, durability, and clarity. PET can withstand a range of temperatures and is resistant to moisture, making it ideal for packaging food and drinks. Additionally, it is recyclable, which adds to its appeal in sustainable practices. - **C. Polyvinyl chloride (PVC)**: PVC is used in a variety of applications, including pipes, electrical cable insulation, and some types of packaging. While it has good chemical resistance, it is not typically used for food and beverage containers due to concerns about leaching harmful chemicals. It is also less flexible than PET. - **D. Polypropylene**: This polymer is used in a variety of applications, including containers, automotive parts, and textiles. While it has good chemical resistance and is more flexible than PET, it does not have the same level of clarity and is less commonly used for clear beverage bottles. 2. **Why PET is the Correct Answer**: - **Chemical Resistance**: PET is resistant to many chemicals, which is crucial for food and beverage storage. It does not react with acids or bases, making it safe for a wide range of products. - **Durability**: PET is strong and can withstand impacts and pressure, which is essential for carbonated beverage bottles that need to hold pressure without bursting. - **Recyclability**: PET is one of the most recycled plastics globally, which makes it an environmentally friendly choice for manufacturers and consumers. - **Clarity and Aesthetics**: PET has excellent optical clarity, making it visually appealing for consumers. This is particularly important for beverage containers where visibility of the product is a selling point. 3. **Why the Other Options are Weaker**: - **Polystyrene**: While it is lightweight and can be molded easily, its brittleness and lower chemical resistance make it unsuitable for applications requiring durability and safety, such as food and beverage containers. - **PVC**: Although it has good chemical resistance, the potential for harmful additives (like phthalates) to leach into food and beverages makes it less desirable for food packaging. - **Polypropylene**: While it is flexible and has good chemical resistance, it lacks the clarity and strength required for beverage bottles, making it less suitable for that specific application. ### Summary of Key Points - **Correct Answer**: B. Polyethylene terephthalate (PET) is the best choice for plastic bottles and containers. - **Properties of PET**: Excellent chemical resistance, durability, clarity, and recyclability. - **Limitations of Other Options**: Polystyrene is brittle, PVC has safety concerns, and polypropylene lacks clarity for beverage applications. - **Common Uses of PET**: Widely used in beverage bottles, food containers, and other packaging applications. This thorough understanding of the properties and applications of these polymers will help you in your studies and in answering similar questions in the future.