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Chapter 10: Q72E. (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

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Most popular questions from this chapter

From the phase diagram for carbon dioxide determine the state of CO2 at:

\(\begin{aligned}{\left( {\rm{a}} \right){\rm{ 20 ^\circ C and 1000 kPa}}}\\{\left( {\rm{b}} \right){\rm{ 10 ^\circ C and 2000 kPa}}}\\{\left( {\rm{c}} \right){\rm{ 10 ^\circ C and 100 kPa}}}\\{\left( {\rm{d}} \right){\rm{ - 40 ^\circ C and 500 kPa}}}\\{\left( {\rm{e}} \right){\rm{ - 80 ^\circ C and 1500 kPa}}}\\{\left( {\rm{f}} \right){\rm{ - 80 ^\circ C and 10 kPa}}}\end{aligned}\)

Titanium tetrachloride\(Ti{\rm{C}}{{\rm{l}}_4}\) has a melting point of\({\rm{23}}{\rm{.2}}^\circ {\rm{C}}\) and has a ΔH fusion =\(9.37\)kJ/mol.

(a) How much energy is required to melt \(263.1\)g\(Ti{\rm{C}}{{\rm{l}}_4}\)?

(b) For\(Ti{\rm{C}}{{\rm{l}}_4}\) which will likely have the larger magnitude: ΔH fusion or ΔH vaporization? Explain your reasoning.

Silane (\({\rm{Si}}{{\rm{H}}_{\rm{4}}}\)), phosphine (\({\rm{P}}{{\rm{H}}_{\rm{3}}}\)), and hydrogen sulfide (\({{\rm{H}}_{\rm{2}}}{\rm{S}}\)) melt at \({\rm{ - 18}}{{\rm{5}}^{\rm{o}}}\)C, \({\rm{ - 13}}{{\rm{3}}^{\rm{o}}}\)C, and \({\rm{ - 8}}{{\rm{5}}^{\rm{^\circ }}}\)C, respectively. What does this suggest about the polar character and intermolecular attractions of the three compounds?

You may have heard someone use the figure of speech “slower than molasses in winter” to describe a process that occurs slowly. Explain why this is an apt idiom, using concepts of molecular size and shape, molecular interactions, and the effect of changing temperature.

Predict which will have the higher boiling point: ICl or Br2.Explain your reasoning.
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