AP Chemistry
3.2 Properties of Solids
A student sorting four pure, unlabeled substances from an electronics-recycling stream obtains the data below. Each substance is known to be a metallic solid, covalent-network solid, ionic solid, or molecular solid, and each type is represented exactly once. The substances do not react or decompose during the measurements.
Which assignment of solid types is most consistent with the data?
| Sample | Melting point, \(^{\circ}\text{C}\) | Electrical conductivity as a solid | Electrical conductivity when molten |
|---|---|---|---|
| \(P\) | \(62\) | Negligible | Negligible |
| \(Q\) | \(1{,}085\) | High | High |
| \(R\) | \(780\) | Negligible | High |
| \(S\) | Greater than \(2{,}000\) | Negligible | Negligible |
Which assignment of solid types is most consistent with the data?
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