property X Y Z particles molecules ions atoms and electrons melting point low high high conducts as solid no no yes The table compares three types of substa...
Question 1 Report
| property | X | Y | Z |
|---|---|---|---|
| particles | molecules | ions | atoms and electrons |
| melting point | low | high | high |
| conducts as solid | no | no | yes |
The table compares three types of substance. Ionic compounds are made of oppositely charged ions, have high melting points and conduct only when molten or in solution. Which column of the table describes an ionic compound?
Answer Details
Check the three rows of the table against what you know about ionic compounds. They are built from oppositely charged ions rather than molecules or free electrons, they have high melting points because the attractions in the giant lattice are strong, and they do not conduct as solids because the ions are fixed.
Column Y shows exactly that combination: ions, a high melting point and no conduction as a solid.
Column Z contains atoms and electrons and conducts as a solid, which describes a metal, where delocalised electrons move through a lattice of positive ions. Column X contains molecules with a low melting point, which describes a simple molecular substance held together by weak intermolecular forces.
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