Question

Classify each of the following materials as to whether it is a metal, ceramic, or polymer. Justify each choice: (a) brass; (b) magnesium oxide (MgO); (c) Plexiglas; (d) polychloroprene; (e) boron carbide \left(\mathrm{B}_{4} \mathrm{C}\right)(B4C); and f cast iron.

Answer 1

Classification is the process of identifying and grouping objects or ideas into predetermined categories.

a. Brass - Metal

Reason: its hardness and workability (malleability)

b. magnesium oxide (MgO) - Metal

Reason: High Thermal Conductivity

c. Plexiglas - Polymer

Reason: it is optically clear and colorless. Its surface is extremely hard.

d. Polychloroprene - Polymer

Reason:  They are produced by polymerization of chloroprene.

e. Boron carbide - Ceramic

Reason - This material is an extremely hard ceramic; it is one of the hardest known materials, after diamond.

f. Cast iron - Metal

Reason: Cast iron has excellent castability due to the combination of high carbon content and silicon.

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