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AP Chemistry 2.4.A: Structure of Metals and Alloys

Explore AP Chemistry 2.4.A questions on metallic solids, delocalized valence electrons, substitutional alloys, and interstitial alloy structures.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Explain how oxidation-reduction reactions involve electron transfer and changes in oxidation state.
  • Apply oxidation numbers and half-reaction methods to balance redox equations and analyze electrochemical data.

2.4.A—Represent a metallic solid and/or alloy using a model to show essential characteristics of the structure and… question 1

[Maximum number: 1]

Sterling silver is an alloy that is commonly used to make jewelry and consists of 92.5\% silver and 7.5\% other metals, such as copper, by mass. Over time, the alloy can form a tarnish of Ag2 S(s)\mathrm{Ag}_{2} \mathrm{~S}(s) when it reacts with hydrogen sulfide, as represented by the following equation.

2Ag(s)+H2 S(g)→Ag2 S(s)+H2(g)2 \mathrm{Ag}(s)+\mathrm{H}_{2} \mathrm{~S}(g) \rightarrow \mathrm{Ag}_{2} \mathrm{~S}(s)+\mathrm{H}_{2}(g)

The following table contains the atomic radii for silver and copper.

Table for Question 2.4.A—Represent a metallic solid and/or alloy using a model to show essential characteristics of the structure and… question 1 — AP Chemistry

Explain why sterling silver is better classified as a substitutional alloy than as an interstitial alloy.

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