Understanding Ionic Structures and Properties

What is an ionic lattice?

• A structure with random arrangement of ions.

• A regular arrangement of alternating positive and negative ions.

• A structure with only positive ions.

• A structure with only negative ions.

Why do ionic compounds conduct electricity when dissolved in water?

• Because the ions are free to move and carry charge.

• Because water is a good conductor of electricity.

• Because the ions are fixed in place.

• Because the water molecules become charged.

Name two ionic compounds.

• Sodium chloride and magnesium oxide.

• Water and carbon dioxide.

• Methane and ethane.

• Oxygen and nitrogen.

Explain why ionic compounds have high melting points.

• Because they have weak forces between molecules.

• Because they have strong ionic bonds that require substantial energy to break.

• Because they are made of small molecules.

• Because they are gases at room temperature.

What type of bonding is present in ionic compounds?

• Covalent bonding.

• Metallic bonding.

• Ionic bonding.

• Hydrogen bonding.

Which of the following is a property of ionic compounds?

• Low melting point.

• High electrical conductivity in solid state.

• Solubility in water.

• Poor thermal conductivity.

What happens to the ions in an ionic lattice when it is heated to its melting point?

• They become fixed in place.

• They start to vibrate more vigorously and eventually break free from the lattice.

• They lose their charge.

• They form covalent bonds.

Which of the following best describes the electrical conductivity of solid ionic compounds?

• They conduct electricity well.

• They do not conduct electricity.

• They conduct electricity only at high temperatures.

• They conduct electricity only when mixed with metals.

What is the main reason for the high boiling points of ionic compounds?

• The presence of free electrons.

• The strong electrostatic forces between oppositely charged ions.

• The weak van der Waals forces.

• The presence of hydrogen bonds.

Which of the following is NOT a characteristic of ionic compounds?

• High melting and boiling points.

• Conduct electricity when molten or dissolved in water.

• Generally soluble in water.

• Low density.