Sublimation (phase transition)

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/sublimation-phase-transition

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the thermodynamic process?Endothermic transition from solid to gas, requiring energy input (enthalpy of sublimation)
2. What is the key examples?Dry ice (solid CO2) and iodine (I2) readily sublime at standard conditions
3. What is sublimation?Sublimation is when a solid turns directly into a gas, skipping the liquid stage, like ice cubes disappearing into thin air.
4. Why does dry ice turn into gas instead of liquid?Dry ice is solid carbon dioxide, and at normal pressure it goes straight from solid to gas, so it never becomes liquid.

Enthalpy of Sublimation: The amount of energy required to convert a substance directly from solid to gas.
Triple Point: The specific temperature and pressure where solid, liquid, and gas phases coexist.
Vapor Pressure: The pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature.
Phase Diagram: A graphical representation showing the stable phases of a substance under different conditions of temperature and pressure.