CHEMISTRY · Multi-part · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties
Problem
Four powdered substances—A, B, C, and D—were tested for various macroscopic properties. The results are summarized below.
Property | A | B | C | D
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Melting point / °C | 801 | 34 | 3550 | 1245
Solubility in water | High | None | None | None
Electrical conductivity (solid)| None | None | None | High
Electrical conductivity (aqueous solution) | High | Not applicable | Not applicable | Not applicable
(a) Determine the predominant bonding type for each substance (choose from: ionic, metallic, covalent molecular, network covalent).
(b) Substance B is placed on a watch glass and warmed gently. It vaporizes without decomposition. Explain how this observation supports your answer for Substance B in part (a).
(c) Predict whether Substance D is likely to react chemically with dilute hydrochloric acid. Justify your prediction using the bonding type and electron behavior in the solid.
(d) Select one additional property (not listed in the table) that could be measured to confirm the bonding assignment for Substance C. Describe the expected result and justify why it would be diagnostic.