Can you just answer the question without explanation

27. One of the reasons polymers are flexible is that (a) they have strong C-C bonds (b) H atoms are attached to C atoms (c) they have a 3D structure (d) they are crosslinked (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 sllighdly 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 polymer.Whenusedaione,PSisvery33Theresultantmaterialisknownasahigh313432. 28. (a) graft (b) alternating (c) block (d) reciprocating (c) 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) increasing fiexibility (b) joining the PB and PS together (c) pinning dislocations (d) thermal conduction (e) making longer chains 32. (a) intensity (b)-impact (c) density (d) conductivity (c) tigidity 33. (a) elastic (b) conductivb (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 glass 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 aligning these chains so that they are 38 each other. This can be accomplished 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 bas the same effect as placing large side groups on the chain. This is called .Thistypeof43 referred to as is used for garbage bags where flexibility is needed. 35. (a) bydrogen (b) oxygen (c) fluorine (d) nitrogen (e) 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) crystallizing (c) extruding (d) increasing the nuraber of hydrogen atoms on each carbon atom of (c) both a and d 41. (a) attraction (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) immobilization (d) deactivation (e) crosslinking 44. (a) ABS (b) LDPE (c) HDPE (d) SBS (c) PVDC