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Liquid Carbon Dioxide

Liquid Carbon Dioxide. Solid carbon dioxide is converted to liquid which quickly converts to gas. Purpose. To produce liquid carbon dioxide To observe rapid phase changes. Demonstration. The solid dioxide sublimed to the gaseous form when inside the balloon

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Liquid Carbon Dioxide

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  1. Liquid Carbon Dioxide Solid carbon dioxide is converted to liquid which quickly converts to gas

  2. Purpose • To produce liquid carbon dioxide • To observe rapid phase changes

  3. Demonstration • The solid dioxide sublimed to the gaseous form when inside the balloon • The dry ice cooled the gas, under pressure within the balloon, to conditions known as the ‘triple point’ • The liquid carbon dioxide rapidly vaporized when poured out of the balloon

  4. Concepts 1. Intermolecular Attractions 2. Physical Changes 3. Triple Point

  5. 1. Intermolecular Attractions • Attractions between molecules of carbon dioxide keep the substance together in both the liquid and solid state • The intermolecular attractions in carbon dioxide are exceptionally weak • Sublimation is possible because of such weak attractions

  6. 2. Physical Changes • Changes in which no new substance is produced • Changes of state • CO2(s) CO2(l) CO2(g) sublimation

  7. 3. Triple Point (I) • The temperature and pressure at which the solid, liquid, and gas phases of a substance coexist • For carbon dioxide the triple point occurs at -56.6 degrees Celsius and 5.11 atmospheres of pressure

  8. Triple Point Triple Point (II) • A phase diagram tells what phase a substance will have at a given temperature and pressure Pressure in atm LIQUID SOLID 5.11 atm GAS -56.6 degrees Temperaturein degrees Celsius

  9. Conclusions • Dry ice will normally sublime at room temperature and pressure • Being contained in a balloon increased the pressure and cooled the temperature • Conditions of the triple point were induced within the balloon

  10. Comments • Dry ice has a temperature of -78.5 degrees Celsius • When shaken on a cool day the carbon dioxide liquid can be heard sloshing around in a carbon dioxide fire extinguisher

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