The diagram shown first represents solid carbon dioxide, also known as dry ice. Which of the other diagrams best represents the carbon dioxide after it has sublimed into a gas?

Name: Chemistry: A Molecular Approach
Author: Tro
ISBN: 9780134874371

검증된 단계별 안내

Understand that sublimation is the process where a solid turns directly into a gas without passing through the liquid phase.

Recognize that solid carbon dioxide (dry ice) consists of CO₂ molecules closely packed in a regular pattern.

When CO₂ sublimates, the molecules gain energy and move apart, transitioning from a solid to a gaseous state.

In the gaseous state, CO₂ molecules are far apart and move freely, unlike in the solid state where they are tightly packed.

Identify the diagram that shows CO₂ molecules spread out and moving freely, representing the gaseous state after sublimation.

주요 개념

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Sublimation

Sublimation is the process in which a solid transitions directly into a gas without passing through the liquid phase. This occurs when the molecules in the solid gain enough energy to overcome intermolecular forces, allowing them to escape into the gas phase. Dry ice, or solid carbon dioxide, sublimates at temperatures above -78.5°C, making it a common example of this phenomenon.

States of Matter

Matter exists in different states, primarily solid, liquid, and gas, each characterized by distinct properties. In solids, particles are closely packed and vibrate in place; in liquids, they are less tightly packed and can flow; in gases, particles are far apart and move freely. Understanding these states is crucial for visualizing how substances like carbon dioxide change form during processes like sublimation.

Phase Diagrams

Phase diagrams are graphical representations that show the states of a substance at various temperatures and pressures. They illustrate the conditions under which a substance exists as a solid, liquid, or gas, and the transitions between these states. For carbon dioxide, the phase diagram helps predict the behavior of the substance under different environmental conditions, including the sublimation process.