I just need the answer choices, you don't need to explain the questions

27. One of the reasons polymers aro flexible is that (a) they have strong CC bonds (b) H atoms are attached to C atoms (c) they have a 3D structure (d) they are crossliniced (e) covalent bonds can rotate 28-34. ABS plastics are based on polybutadiene [PBYpolystyrane [PS] 28 copolymers. The polyacrylonitrile [PA] is simply added to obtain a range of materials with alightly different properties. PS is a stiff, strong polymer because of 29 whereas PB is 30. The material consists of PS which contains some PB. The PB/PS copolymer serves the purpose of 31 . The resultant material is known as a high 32 polymer. When used alone, PS is very 33 at room temperature because 28. (a) graft (b) altermating (c) block (d) reciprocating (e) condensed 29. (a) high crystallinity (b) bulky side groups (c) crosslinking (d) larger atoms (e) stronger bonds berween C atoms 30. (a) lighter (b) elastic (c) less stiff (d) biodegradable ( (e) glassy 31. (a) increating flexibility (b) joining the PB and PS together (c) pinning dislocations (d) thermal conduction (e) making longer chains 32. (a) intensity (b) impact (c) densify (d) conductivity (c) rigidity 33. (a) elastic (b) conductive (c) transparent (d) brittle (c) flaky 34. (a) it has flexible chains (b) it has free electrons (c) light energies are greater than the band gap energy (d) it is below the giass transition temperature (c) it contains weak bonds 35-44. The simplest and most common polymer has only 335 atoms on a carbon chain, 36 atoms to each carbon atom, and is called 37 . A strong 37 fiber can be made by alligning these chains so that they are 38 each other. This can be accomplisbed by a process called 39 . We can also make strong and more rigid 37 by 40 the polymer. This increases the 41 between chains. Sometimes we add side branches of the same polymer chain to the main chain. If these side branches are 442 and many, their addition has the same effect as placing large side groups on the chain. This is called 43 . This type of 37 referred to as 44 is used for garbage bags where flexibility is needed. 35. (a) bydrogen (b) oxygen (c) fluorine (d) nitrogen (c) both a and b 36. (a) one (b) two (c) a varying number of both (d) four 37. (a) polypropylene (b) PVC (c) polystyrene (d) polyethylene (c) polycarbonate 38. (a) parallel to (b) perpendicular to (c) across (d) outside (c) at an angle to 39. (a) pulling (b) extrusion (c) gel spinning (d) weaving (c) stretching 40. (a) annealing (b) erystallizing (c) extruding (d) increasing the number of hydrogen atoms on each carboa atom of (e) both a and d 41. (a) atinction (b) repulsion (c) distance (d) both b and c(c) both a and c 42. (a) as long as the original chain (b) long (c) short (d) straight (c) both b and d 43. (a) steric hindrance (b) interference (c) immobitization (d) deactivation (c) crosslinking 44. (a) ABS (b) LDPE (c) HDPE (d) SBS (c) PVDC