Properties of Ionic Compounds Quiz
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5 questions, one answer each
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1. Why do ionic compounds have high melting points?
- A. Weak intermolecular forces need overcoming
- B. Strong electrostatic forces act between ions in all directions and need a lot of energy to break
- C. They have delocalised electrons
- D. They are simple molecules
2. Does a solid ionic compound conduct electricity?
- A. Yes, always
- B. No, because the ions cannot move
- C. No, because ions have no charge
- D. Yes, but only at low temperature
3. When does an ionic compound conduct electricity?
- A. Only as a solid
- B. When molten or dissolved in water
- C. Never
- D. Only when heated but still solid
4. What is the correct reason ionic compounds conduct electricity when molten?
- A. The ions gain extra charge when heated
- B. The ions become free to move and carry current
- C. The compound turns into a metal
- D. The compound becomes covalent
5. A student tests solid potassium bromide and finds it does not conduct electricity, but the molten compound does. What is the best explanation?
- A. Potassium bromide is not actually ionic
- B. In the solid the ions are fixed in a lattice; when molten they are free to move and carry charge
- C. Molten compounds always conduct regardless of bonding
- D. Solid ionic compounds have no ions