PROBLEM 84P
Which solid has the highest melting point? Why?
(a) C (s, diamond)
(b) Kr(s)
(c) NaCl(s)
(d) H2O(s)
Solution 84P
Diamond is covalent crystal. It has the highest melting point because high energy covalent bonds hold the crystal together. NaCl is the next highest. Ionic bonds hold the crystal together. Next is H2O. Hydrogen bonds hold that crystal together. Kr has the lowest melting point, only weak Van der Waals forces hold that crystal together.