This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
Step 7: Solve 4 (a) (i) Two properties of plastics useful as engineering materials. • They are lightweight with a high strength-to-weight ratio. • They are corrosion-resistant and do not react with many chemicals. Step 8: Solve 4 (a) (ii) Give the difference between thermoplastics and thermosetting plastics. Thermoplastics can be repeatedly softened by heating and hardened by cooling, allowing them to be reshaped. Thermosetting plastics, once molded and hardened, undergo an irreversible chemical change and cannot be softened or reshaped by heating. Step 9: Solve 4 (a) (iii) Explain why thermoplastics can be recycled but thermosets cannot. Thermoplastics have polymer chains that are not cross-linked, allowing them to melt and flow when heated, making them suitable for recycling. Thermosets have extensively cross-linked polymer chains, forming a rigid, permanent structure that degrades or burns when heated rather than melting, which prevents them from being recycled. Drop the next question! 📸