Unit 1 — Principles of Chemistry — Strength check

The table shows some properties of four substances, **P**, **Q**, **R** and **S**. | **Substance** | **Melting Point / **^**o****C** | **Boiling Point / **^**o****C** | **Conducts electricity when** | | |---|---|---|---|---| | **solid** | **liquid** | | | | | P | 3410 | 5930 | yes | yes | | Q | 734 | 1435 | no | yes | | R | -95 | 69 | no | no | | S | 2507 | 3900 | no | no | Use the information in the table to answer the following questions. You may use each letter once, more than once or not at all. Choose a substance that is a solid at 3000 °C.

• Asubstance **P**
• Bsubstance **Q**
• Csubstance **R**
• Dsubstance **S**