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AP Chemistry 2.3: Structure of Ionic Solids

Practice AP Chemistry 2.3 questions on representing ionic crystals as ordered arrays of cations and anions that maximize attraction and minimize repulsion.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Use kinetic-energy distributions and activation energy to explain how temperature or catalysts affect rates.
  • Interpret concentration, collision, and rate data to compare reaction mechanisms and experimental outcomes.

Covered syllabus points

2.3.A—Represent an ionic solid with a particulate model that is consistent with Coulomb’s law and the properties of…

2.3 Structure of Ionic Solids question 1

[Maximum number: 1]

A student investigates the enthalpy of solution, ΔHsoln \Delta H_{\text {soln }}, for two alkali metal halides, LiCl and NaCl. In addition to the salts, the student has access to a calorimeter, a balance with a precision of ±0.1 g, and a thermometer with a precision of ±0.1°C.

Below is a representation of a portion of a crystal of LiCl. Identify the ions in the representation by writing the appropriate formulas ( Li+\mathrm{Li}^{+}or Cl−\mathrm{Cl}^{-}) in the boxes below.

Figure for Question 2.3 Structure of Ionic Solids question 1 — AP Chemistry
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