1. (10 points) Classify each of the following materials as to whether it is metal, ceramic

or polymer

(a) Copper

(b) Aluminum oxide (Al2O3)

(c) Plexiglas

(d) Boron Nitride (BN)

(e) Cast iron

2. (5 points) Which of these materials would likely be the most brittle?

(a) Al2O3

(b) Polythene

(c) Nickel

(d) Wood

3. (5 points) Which of these is directional in nature?

(a) Ionic bonding

(b) Covalent bonding

(c) Metallic bonding

(d) Both (a) and (b)