Silicon carbide is a semiconductor containing silicon and carbon. 1) sic is bonded by what type of atomic bonding? explain why? 2) what type of crystal structure does sic have? explain why? 3) calculate the lattice constant for sic. 4) calculate the theoretical density of sic.

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0