Question detail
What happens to the lattice structure of an ionic compound when it is melted?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Bonding
Question
- A. The ionic bonds become stronger.
- B. The lattice structure remains intact.
- C. The ions are free to move.
- D. The compound turns into a gas.
Answer
The ions are free to move.
Explanation
When an ionic compound is melted, the rigid lattice structure breaks down, allowing the ions to move freely, which is why molten ionic compounds can conduct electricity.
Common mistake
Misunderstanding Ionic Lattice Strength
Students often confuse the strength of ionic lattices with the size of the ions alone, neglecting the effect of charge.
To correctly explain ionic lattice strength, remember that it is influenced by both the charge of the ions and their ionic radii. Use the formula for lattice energy, which indicates that higher charges lead to stronger attractions. For example, when comparing NaCl and MgO, MgO has a higher lattice energy due to the +2 charge on Mg compared to the +1 charge on Na. Therefore, the ionic lattice strength increases with higher ionic charges and smaller ionic radii.
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