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AP Chemistry 2.4: Structure of Metals and Alloys

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

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Use collision-model and rate-law reasoning to explain how concentration, temperature, and catalysts affect rates.
  • Interpret reaction-rate data or energy profiles to compare activation barriers and mechanism steps.

Covered syllabus points

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

2.4 Structure of Metals and Alloys 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 Structure of Metals and Alloys question 1 — AP Chemistry

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

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