Unit 3: Properties of Solids

The two types of bonding in graphite are

• Covalent and ionic

• Metallic covalent

• Ionic and metallic

• Covalent and weak intermolecular forces

Diamond is hard to the presence of:

• Directional intermolecular forces in 3 dimensions

• Directional dipole-dipole forces in 3 dimensions

• Directional hydrogen bonding in 3 dimensions

• Directional covalent bonding in 3 dimensions

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Silicon carbide, SiC, has a similar structure to diamond. What type of properties would you expect?

• Hard, good electrical conductor, high melting point

• Hard, good electrical conductor, low melting point

• Soft, good electrical conductor, high melting point

• Hard, poor electrical conductor, high melting point

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The type of crystalline solid which is a good conductor in solid as well as molten state?

• Ionic Solid

• Metallic Solid

• Covalent Solid

• Molecular Solid

Which type of solid has mobile electrons in the crystal (sea of electrons)?

• Ionic

• Molecular

• Metallic

• Covalent Network

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Which is an example of an ionic crystal?

• Quartz

• NaCl

• Ammonia

• Iron

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Which is an example of a metallic crystal?

• Quartz

• NaCl

• Ammonia

• Iron

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Solids have many different properties. ___________ solids are known for their ability to be flattened into a sheet, stretched into a wire, and to conduct energy well.

• Molecular

• Metallic

• Covalent Network

• Ionic

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A sample of a hard, solid binary compound at room temperature did not conduct electricity as a pure solid but became highly conductive when dissolved in water. Which of the following types of interactions is most likely found between the particles in the substance?

• Ionic bonds

• Metallic bonds

• Covalent bonds

• Hydrogen bonds

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Which of the following could be the identity of a white crystalline solid that exhibits the following properties?

-It melts at 320°C.

-It does not conduct electricity as a solid.

-It conducts electricity in an aqueous solution.

• C₆H₁₂O₆(s)

• NaOH(s)

• SiO₂(s)

• Cu(s)

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