1000 Liquid 800 B 7 600 Temperature, T (C) Solid a or (Cu) E 400 Solid nor (Zn) 200 40 0 60 80 100 Cu wt% Zn Zn 6a. In the Cu-Zn binary system above, identify a peritectic point and write its composition and temperature. (Your answer must be within 2 percentage points of the official composition and within 10 of the official temperature to be eligible for full credit for this question.) [4 points) 6b. Write the reaction that takes place upon cooling through this peritectic point. [3 points]