Question

Q1a) A high school is launching a recycling campaign for a week. It was found that some students have mixed the scrap steels, polyethylene terephthalate bottles and aluminium cans into a recycle bin. Using understanding of material properties, describe the order of methods, that enable the students to separate all the wastes found in the recycle bin, in a safe way, without causing harmful towards the environment, by using the facilities/ resources found in the school. Q1b) A pure FCC iron is doped by with impurity at an elevated temperature wherein the surface impurity concentration is maintained at 1.0 wt%. After 20.6 s, the concentration of impurities is 0.35 wt% at a position of 3.5 mm below the surface. Determine which impurity diffusing species in Table Qlb satisfy the diffusion condition stated. Impurity C in FCC Fe C in BCC Fe N in FCC Fe N in BCC Fe Do, mm²/s-1 Qx, kJ/mol 23 138 1.1 0.34 145 0.47 87 H in FCC Fe 0.63 H in BCC Fe 0.12

Please answer both the parts. Thank you.

Answer 1

Answer 1(a)

Step I:wear golves,hair cap,mask and Apron.

Step II:familiar with local laws regarding recycling process in your town/city.

StepIII:seperate aluminium cans and bottles into seperate bins and steel scrap left in the seperate bin.

Srep IV: dont remove labels printed on the can and bottles

Step V:check marking on products marked with 1 and 2 are recyclable .{code-a triangle with number inside }

Step VI:contact local agent for collection and they are again used after processing .

warning:avoid contact with eyes and other delicate parts .

1 (b) in this question the temperature is not given so not able to identified .