Can you just answer the question without explanation

11-12. A mbber ohain is known as a/an 11 because it aatomatically raturns to a/an 12 state when the force is removed after being suetched. 11. (a) erosslinked spring (b) graft copolymer (c) branched copolymer (d) copolymer apring (e) antrople spring 12. (a) convoluted (b) amorphous (c) crosslinkod (d) crystalline (c) coiled 13-26. Polyroen are based on chains of carbon atoms held together by 13 bonds. This gives the chains high strength, but the weakness in polymers which gives them flexibility is 14 . Below a certain teroperature, called the 15 temperature, polymers become britte. For polystyrene, often encountered as styrofosm, it is 16 . The simplest and most common polymer is polyethylene, in which each carbon atom in the chain is attacbed to two hydrogen atoms. In polystyrene one of every four hydrogen atoms is replaced with a 17 . This makes the chain stiffer because of 18 . Some important materials are made using a mixture of polymers called a(n) 1919. HIPS is a more complex polymer which includes chains called a 20 which join 2121 inciusions to a polystyrene matrix. In 21 car tires the material is stiffened by 22 the chains using 23 atoms and also by adding 24 . Some 22 also occurs when 2121 is exposed to air and 2325. for long times because _ 26 atorns can do the same thing as does . In addition the 24 helps by keeping the 25 out. 13. (a) bydrogen (b) ionic (c) covalent (d) metallic (c) both b \& c 14. (a) dislocations (b) crosslinks (c) bonds missing electrons (d) secondary bonds (a) surface defects 15. (a) critical (b) recrystallization (c) glass transition (d) solidification (c) annealing 16. (a) well above 100C (b) around room temperature (c) below 0C (d) over 1000C (c) about 100C 17. (a) fluorine atom (b) chlorine atom (c) benzene ring (d) sulfur atom (e) none of these 18. (a) steric hindrance (b) crosslinking (c) grain refining (d) work bardening (e) crystallization 19. (a) alloy (b) copolymer (c) bipolymer (d) amalgam (c) blend 20. (a) blend (b) block copolymer (c) bipolymer (d) graft copolymer (c) bridging polymer 21 (a) rubber (b) acrylic (c) carbide (d) interstitial (e) carbon 22. (a) crystallizing (b) hardening (c) crosslinking (d) lengthening (c),reducing 23. (a) carbon (b) sulfur (c) oxygen (d) lithium (c) phosphorms 24. (a) disiocations (b) precipitates (c) impurities of any sort (d) carboa blacks (c) nothing extra is added 25. (a) acids (b) sunlight (c) pollution (d) beavy use (c) ail 26. (a) carbon (b) sulfur. (c) oxygen (d) nitrogen (c) bydrogen