Question

Why is solid CO2 called dry ice?

Answer 1

Dry ice is basically solidified carbon dioxide, and is called so because the gas on solidifying gives an appearance similar to that of ice. Unlike ordinary ice, it does not melt into a liquid but changes directly into CO2gas, a phenomenon known as sublimation. It changes into gaseous state at and above -78.5 degree Celsius. As this temperature is much lower than water, it is much colder than water ice. Its density varies from1.2 - 1.6 g / cm3. It is therefore denser than water.It is mainly used as a cooling agent because it has temperaturelower than that of water ice. It isused for preserving frozen foods,ice cream etc. PLZZZ MARKS AS BRILLANT ANSWER.

Answer 2

Answer:

Take an ice cube from the freezer, place it on a table, and you'll soon be cleaning up a puddle of water, where the ice cube once was but not longer is.

Take a piece of dry ice, which is frozen Carbon Dioxide (CO2), place it on a table, and you'll soon see nothing at all.

No more solid. No liquid.

This is because dry ice (CO2), unlike regular ice (H2O), sublimates.

Sublimation is simply a fancy name for a direct transition between solid and gas.

Normally, compounds go from a solid, to a liquid, and only then turn into a gas.

This is exactly what happens to an ice cube from your freezer. It melts and then, if it's left long enough, it evaporates.

Dry ice skips the liquid phase all together, and is never "wet". It will change phases from a solid into a gas and then disappear into the surrounding air.

Explanation:

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