---
title: "When a sample of solid carbon dioxide, \\(\\text{CO}_2\\text{(s)}\\), is placed in an open container at \\(25\\text{ }^\\circ\\text{C}\\), it vaporizes completely without leaving a residue. Similarly, when a sample of solid ammonium carbamate, \\(\\text{NH}_2\\text{COONH}_4\\text{(s)}\\), is placed in an open container at \\(25\\text{ }^\\circ\\text{C}\\), it also vaporizes completely without leaving a residue. Chemical analysis reveals that the vaporization of \\(\\text{NH}_2\\text{COONH}_4\\text{(s)}\\) produces a gaseous mixture of ammonia, \\(\\text{NH}_3\\text{(g)}\\), and carbon dioxide, \\(\\text{CO}_2\\text{(g)}\\), according to the following equation:  \\[ \\text{NH}_2\\text{COONH}_4\\text{(s)} \\rightarrow 2\\text{ NH}_3\\text{(g)} + \\text{CO}_2\\text{(g)} \\]  Which of the following correctly classifies the vaporization of \\(\\text{NH}_2\\text{COONH}_4\\text{(s)}\\) and provides the best justification at the particulate level?"
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url: "https://nerd-notes.com/ubq/123703/"
date_modified: "2026-09-28T12:02:03+00:00"
---

# When a sample of solid carbon dioxide, \(\text{CO}_2\text{(s)}\), is placed in an open container at \(25\text{ }^\circ\text{C}\), it vaporizes completely without leaving a residue. Similarly, when a sample of solid ammonium carbamate, \(\text{NH}_2\text{COONH}_4\text{(s)}\), is placed in an open container at \(25\text{ }^\circ\text{C}\), it also vaporizes completely without leaving a residue. Chemical analysis reveals that the vaporization of \(\text{NH}_2\text{COONH}_4\text{(s)}\) produces a gaseous mixture of ammonia, \(\text{NH}_3\text{(g)}\), and carbon dioxide, \(\text{CO}_2\text{(g)}\), according to the following equation:

\[ \text{NH}_2\text{COONH}_4\text{(s)} \rightarrow 2\text{ NH}_3\text{(g)} + \text{CO}_2\text{(g)} \]

Which of the following correctly classifies the vaporization of \(\text{NH}_2\text{COONH}_4\text{(s)}\) and provides the best justification at the particulate level?

When a sample of solid carbon dioxide, \(\text{CO}_2\text{(s)}\), is placed in an open container at \(25\text{ }^\circ\text{C}\), it vaporizes completely without leaving a residue. Similarly, when a sample of solid ammonium carbamate, \(\text{NH}_2\text{COONH}_4\text{(s)}\), is placed in an open container at \(25\text{ }^\circ\text{C}\), it also vaporizes completely without leaving a residue. Chemical analysis reveals that the vaporization of \(\text{NH}_2\text{COONH}_4\text{(s)}\) produces a gaseous mixture of ammonia, \(\text{NH}_3\text{(g)}\), and carbon dioxide, \(\text{CO}_2\text{(g)}\), according to the following equation:

\[ \text{NH}_2\text{COONH}_4\text{(s)} \rightarrow 2\text{ NH}_3\text{(g)} + \text{CO}_2\text{(g)} \]

Which of the following correctly classifies the vaporization of \(\text{NH}_2\text{COONH}_4\text{(s)}\) and provides the best justification at the particulate level?

- **A.** The process is a physical change because the solid transitions directly into the gas phase without forming an intermediate liquid phase.
- **B.** The process is a physical change because the total mass of the gaseous products formed is equal to the initial mass of the solid consumed.
- **C.** The process is a chemical change because covalent and ionic bonds within the reactant are broken to form new substances with distinct chemical compositions.
- **D.** The process is a chemical change because intermolecular attractions are overcome, allowing the particles to separate and occupy a significantly larger volume.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/123703/*