Properties of Ionic Compounds Quiz

What is the primary reason ionic compounds form crystalline structures?

• They are formed by covalent bonds.

• They are formed by the attraction between cations and anions.

• They are composed of molecules.

• They are formed by metallic bonds.

What is a formula unit in the context of ionic compounds?

• A molecule in a covalent compound.

• A single atom in a metallic compound.

• The smallest repeating unit in an ionic compound.

• The smallest repeating unit in a covalent compound.

How do water molecules interact with ionic compounds to dissolve them?

• Water molecules form covalent bonds with ions.

• Water molecules surround ions, breaking the ionic bonds.

• Water molecules repel ions, causing them to separate.

• Water molecules replace ions in the compound.

Which part of water molecules is attracted to the positive ions in an ionic compound?

• The entire water molecule.

• The oxygen part.

• The hydrogen part.

• The covalent bonds.

Why do ionic compounds generally have high melting points?

• They have strong ionic bonds that require more energy to break.

• They have strong covalent bonds.

• They are composed of large molecules.

• They are composed of light elements.

What is required to separate the formula units in an ionic compound?

• Pressure.

• No temperature change.

• Low temperature.

• High temperature.

What happens to ionic compounds when they are dissolved in water?

• They form a gas.

• They conduct electricity due to free-moving ions.

• They form a solid precipitate.

• They become non-conductive.

In what state do ionic compounds conduct electricity?

• Solid state.

• Gaseous state.

• When dissolved in water or melted.

• When frozen.

What characteristic of ionic compounds makes them brittle?

• Their amorphous structure.

• Their crystal structure breaks along the edges of formula units.

• Their metallic bonds.

• Their covalent bonds.

What happens when the crystal structure of an ionic compound is broken?

• It forms a smooth surface.

• It forms a liquid.

• It breaks along the edges of the formula unit.

• It becomes more flexible.