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title: "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.  | 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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url: "https://nerd-notes.com/ubq/119464/"
date_modified: "2026-08-19T12:40:34+00:00"
---

# 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.

| 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?

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.

| 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?

- **A.** \(P\): molecular; \(Q\): ionic; \(R\): metallic; \(S\): covalent network
- **B.** \(P\): molecular; \(Q\): metallic; \(R\): ionic; \(S\): covalent network
- **C.** \(P\): covalent network; \(Q\): metallic; \(R\): ionic; \(S\): molecular
- **D.** \(P\): molecular; \(Q\): metallic; \(R\): covalent network; \(S\): ionic

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119464/*