1. Describe the common feature and differences between polymers and the other two types of materials (metal and ceramic) in terms of building blocks and networks. 2. What is a functional group? List five functional groups. 3. The chemical bonding between C-C on polymer chains is covalent. Covalent bonds are typically rigid and lack tolerance to any deformation that attempts to change their bonding direction. Discuss how the rigid covalent C-C bonds in the backbone allow for the flexibility of polymer chains? 4. Discuss why polymers can never be fully crystallized, while all metals can. 9. What is esterification? What are polyesters? What is hydrolysis? 10. Describe the selection principles of implant polymers. 11. Describe steric hindrance. 12. Rank the following bonding according to their chemical stabilities: C-C, C-F, C-Si, Si-O, CO, CN 13. Describe the strategies of tuning degradation of polymers