Introduction to Solids

Which type of solid is hard, brittle, and nonconducting unless dissolved in H₂O?

• Ionic Crystal
• Covalent Molecular Crystal
• Metallic Crystal
• Covalent Network Crystal

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

• Ionic Crystal
• Covalent Molecular Crystal
• Metallic Crystal
• Covalent Network Crystal

Which type of solid typically has the lowest melting point of the four types of crystals?

• Ionic Crystal
• Covalent Molecular Crystal
• Metallic Crystal
• Covalent Network Crystal

Which type of solid has strong covalent bonds between neighboring atoms?

• Ionic Crystal
• Covalent Molecular Crystal
• Metallic Crystal
• Covalent Network Crystal

Which is an example of an ionic crystal?

• Quartz
• MgCl₂
• Ammonia
• Iron

Which is an example of a molecular crystal?

• Quartz
• NaCl
• Ammonia
• Iron

Which is an example of a metallic crystal?

• Quartz
• NaCl
• Ammonia
• Iron

Which is an example of a covalent network crystal?

• Quartz
• NaCl
• Ammonia
• Iron

A chunk of solid lead is dropped into a pool of molten (liquid) lead. The solid lead sinks to the bottom of the pool. What does this tell you about the density of each material? 

• The densities are the same
• The density of the liquid is greater than of the solid
• The density of the solid is greater than of the liquid
• The density of the molten lead is greater than of the solid

Which is less compressible?

• Amorphous Solid
• Crystalline Solid