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Chapter 11: Problem 71

Why is solid carbon dioxide called dry ice?

Short Answer

Expert verified
Solid carbon dioxide is called 'dry ice' because, unlike most solids, it doesn't melt into a liquid when it warms up. Instead, it sublimates, or turns directly into a gas, leaving no liquidy mess - thus earning the name 'dry'.

Step by step solution

01

Understanding the Basics

First thing to know is that Carbon dioxide (CO2) is a gas at standard temperature and pressure. However, in certain conditions, CO2 can be forced to become a solid - this solid form of CO2 is what's often referred to as 'dry ice'.
02

Phase Changes and Sublimation

Most substances have three states: solid, liquid and gas. Transitions between these states are usually named melting, freezing, vaporization, condensation, etc. However, some substances can skip the liquid phase and transition directly from a solid to a gas. This process is called sublimation.
03

Why 'Dry Ice'?

When solid carbon dioxide is exposed to normal pressure and room temperature, it doesn't liquefy. Instead, it starts sublimating - turning directly into a gas. Since it leaves no liquid residue behind, it is called 'dry' ice.

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Most popular questions from this chapter

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