---
title: "A student dissolves a sample of solid calcium chloride, \\(\\text{CaCl}_2\\text{(s)}\\), in an insulated calorimeter containing water at room temperature. The student claims that the dissolution of \\(\\text{CaCl}_2\\text{(s)}\\) is an exothermic process. Which of the following experimental observations provides the best evidence to support the student’s claim?"
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url: "https://nerd-notes.com/ubq/119220/"
date_modified: "2026-08-19T12:39:24+00:00"
---

# A student dissolves a sample of solid calcium chloride, \(\text{CaCl}_2\text{(s)}\), in an insulated calorimeter containing water at room temperature. The student claims that the dissolution of \(\text{CaCl}_2\text{(s)}\) is an exothermic process. Which of the following experimental observations provides the best evidence to support the student’s claim?

A student dissolves a sample of solid calcium chloride, \(\text{CaCl}_2\text{(s)}\), in an insulated calorimeter containing water at room temperature. The student claims that the dissolution of \(\text{CaCl}_2\text{(s)}\) is an exothermic process. Which of the following experimental observations provides the best evidence to support the student's claim?

- **A.** The temperature of the aqueous solution increases as the solid dissolves, demonstrating that thermal energy is transferred from the chemical system to the surroundings.
- **B.** The temperature of the aqueous solution decreases as the solid dissolves, demonstrating that thermal energy is absorbed by the chemical system from the surroundings.
- **C.** The solubility of the solid in water increases when the temperature is raised, demonstrating that thermal energy acts as a reactant in the dissolution process.
- **D.** The electrical conductivity of the solution increases as the solid dissolves, demonstrating that thermal energy is produced alongside mobile hydrated ions.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119220/*