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Chapter 10: Q72 E (page 592)

Identify the following substances as ionic, metallic, covalent network, or molecular solids: Substance A is malleable, ductile, conducts electricity well, and has a melting point of\({\rm{1135 ^\circ C}}\). Substance B is brittle, does not conduct electricity as a solid but does when molten, and has a melting point of\({\rm{2072 ^\circ C}}\). Substance C is very hard, does not conduct electricity, and has a melting point of\({\rm{3440 ^\circ C}}\). Substance D is soft, does not conduct electricity, and has a melting point of\({\rm{185 ^\circ C}}\).

Short Answer

Expert verified

The substances are:

A is metallic, B is ionic, C is covalent and D is molecular solid.

Step by step solution

01

To identify the following substances 

Metallic solid :-

(a) Electrical Conductivity :- Good conductors of heat and electricity

(b) Melting Point :- Melting point depends strongly on electronic configuration.

(c) Appearance :- Malleable, ductile and lustrous.

(d) Water solubility :- Insoluble

Covalent solid :-

(a) Electrical Conductivity :- Poor conductors of heat and electricity

(b) Melting Point :- High

(c) Appearance :- Hard, ductile and lustrous.

(d) Water solubility :- Insoluble

Molecular solid :-

(a) Electrical Conductivity :- Poor conductors of heat and electricity

(b) Melting Point :- Low

(c) Appearance :- Soft and dull surface.

(d) Water solubility :- Insoluble

Ionic solid :-

(a) Electrical Conductivity :- Poor conductors of heat and electricity

(b) Melting Point :- relatively high Melting point.

c) Appearance :- Hard, brittle and dull

d) Water solubility :- Soluble

Hence we can say that A is metallic, B is ionic, C is covalent and D is molecular solid.

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