Please help. Table 1: The physical characteristics of six unknown samples.Sample B> 1700°C7InsolubleInsulatorPropertyMelting PointHardnessSolubility (H₂O)Electrical ConductivitySample A<-200°CN/ASolubleInsulatorSample C< 180°CN/AInsolubleInsulatorSample D> 600°C3InsolubleConductorSample E> 700°C9SolubleAqueous Conductor 24. Based on your understanding of the relationships between the structures and physical properties ofelements and compounds, which of the substances (Table 1) is most likely a covalent network solid?Why? Explain your reasoning in at least two (2) sentences.

Answered: 24. Based on your understanding of the…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Table 1: The physical characteristics of six unknown samples.
Sample B
> 1700°C
7
Insoluble
Insulator
Property
Melting Point
Hardness
Solubility (H₂O)
Electrical Conductivity
Sample A
<-200°C
N/A
Soluble
Insulator
Sample C
< 180°C
N/A
Insoluble
Insulator
Sample D
> 600°C
3
Insoluble
Conductor
Sample E
> 700°C
9
Soluble
Aqueous Conductor

24. Based on your understanding of the relationships between the structures and physical properties of
elements and compounds, which of the substances (Table 1) is most likely a covalent network solid?
Why? Explain your reasoning in at least two (2) sentences.

Expert Solution

Step 1

Covalent network solids consist of atoms covalently bonded into a three-dimensional network or layers of two-dimensional networks.

The most commonly known covalent network solids are diamond, graphite, silicon dioxide, and fullerene.

Now, the physical properties of covalent network solids are-

Due to the strength of covalent bonds, covalent network solids have high melting points (higher than 1000^oC) .
Three-dimensional network solids (such as diamond or silicon dioxide) are hard and rigid, while two-dimensional network solids (such as graphite) are soft due to the ease with which the network layers can slide over each other.
All covalent network solids are insoluble in water and are poor conductors of electricity (except graphite) due to the absence of free electrons.

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