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Chapter 14: Q14P (page 620)

How do the physical properties of a network covalent solid and a molecular covalent solid differ? Why?

Short Answer

Expert verified

The properties of network solid reflect the necessity of breaking chemical bonds throughout the substances, whereas the properties of molecular solids reflect the weaker force between individual molecules. Eg, boron is network covalent metalloid black, hard, and has a very high melting point.

Step by step solution

01

Covalent solid

Covalent solid comprises covalently bonded atoms into a three-dimensional network of two-dimensional networks whereas molecular solids comprise discrete molecules held together by intermolecular forces.

02

Explanation

Generally, network solids have very high melting and boiling points and are very hard. The molecular solids have low melting and boiling points and are soft.

The properties of network solid reflect the necessity of breaking chemical bonds throughout the substances, whereas the properties of molecular solids reflect the weaker force between individual molecules. Eg, boron is network covalent metalloid black, hard, and has a very high melting point.

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Hydrogen peroxide can act as either an oxidizing agent or a reducing agent. (a) When H2O2 is treated with aqueous KI, I2 forms. In which roleH2O2 is acting? What is the oxygen- containing product formed? (b) When H2O2 is treated with acidic KMnO4, the purple color of MnO4-disappears and a gas forms . In which role isH2O2 acting? What is the oxygen-containing product formed?

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