Composition of Solids

Which best describes CO₂ (pictured above)?

• Covalent (non-metal elements only)

• Ionic (both metal and non-metal elements)

• Metallic (metal elements only)

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

• Ionic

• Molecular

• Metallic

• Covalent Network

Which is an example of an ionic crystal?

• Graphite

• NaCl

• Ammonia

• Iron

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NGSS.HS-PS1-3

Which is an example of a metallic crystal?

• Quartz

• NaCl

• Ammonia

• Iron

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

Which two substances are ionic compounds?

• sodium chloride (NaCl)

• carbon dioxide (CO₂)

• water (H₂O)

• magnesium oxide (MgO)

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NGSS.MS-PS1-1

Which three of the following are features of ionic compounds? (click 3 boxes)

• They have bonds between metals and non-metals.

• They have bonds between two non-metals.

• They form simple molecular structures.

• They form giant ionic lattices.

• They involve the transfer of electrons.

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NGSS.HS-PS1-3

Ionic compounds form giant ionic lattices. What forces hold the giant ionic lattices together?

• strong frictional forces between the surfaces of the atoms

• strong magnetic forces of attraction between the poles of ions

• strong electrostatic forces of attraction between oppositely charged ions

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NGSS.HS-PS2-4

Why do ionic compounds have high melting and boiling points?

• Their ions are free to move.

• Their ions are held in fixed positions.

• They have many strong bonds.

• They have many weak bonds.

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NGSS.HS-PS1-3

NGSS.HS-PS2-4

True or false? Ionic compounds conduct electricity when they are in their solid state.

• true

• false