What are the attractive forces that must be overcome to: a) boil silicon hydride

Question

What are the attractive forces that must be overcome to: a) boil silicon hydride SiH,? 10) b) vaporize calcium chloride? c) dissolve Cl2 in carbon tetrachloride, CCl? d) boil water? Classify each of the following solids as metallic, network covalent, ionic, or molecular a) It melts below 100°C and is insoluble in water 11) b) It conducts electricity only when melted c) It is insoluble in water and conducts electricity Of the four gencral types of solids, mctallic, network covalent, ionic, or molecular, which onc(s) a) are generally low-boiling? 12) b) are ductile and malleable? o) are gencrally soluble in nonpolar solvents? 13) Classify each of the following species as molecular, network covalent, ionic, or metallic a) K b) CaCO, c) CaHIs d) C (diamond) e) HCl (g) Barium has an atomic radius of 0 217 nm. The volume of one of its cubic unit cells is 14) 0.127 nm. What is the geometry of the barium unit cell?

Explanation / Answer

Q10

a)

SiH4 --> dispersion forces only

b)

CaCl2 --> ionic interations, i.e. ion-ion interactions

c)

dissolving Cl2 in CCl4 --> ion-dipole interactions

d)

boil water --> hydrogen bonding + dipol-dipole interactions must be broken

11)

a)

this must be molecular, since it has low MP and will not mix with water

b)

if condues electricity when molten, the must bet network covalent

c)

if insoluble in water and conudce electricity --> metallic bonding such as solid metals

Q12

general low BP --> molecular

ductile + malleable --> metals

soluble in noppolar solvents --> molecular or even network covalents

Q13

this is metallic

CaCO3 --> this is ionic + molecular in CO3-2

C8H18 thi is mostly molecular

C diamos --> network covalent

HCl --> this is molecular+ dipole

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