8 In general, ionic bonds form between a metal and a nonmetal. Covalent bonds usually form between two nonmetals.
Which of the following pairs of atoms is most likely to form a covalent bond?
A magnesium and chlorine
B copper and bromine
C nitrogen and oxygen
D potassium and phosphorus

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.