Simulations & Videos for

Lesson 5.8: Can Gases Dissolve in Water?

Accompanying Lesson Plan: Lesson 5.8: Can Gases Dissolve in Water?

Carbon Dioxide (CO2) Molecule

  • Carbon dioxide is made up of one carbon atom covalently bonded to two oxygen atoms.
  • Although electrons are shared, they are not shared equally between the carbon and the oxygen atoms.
  • The oxygen atom has a stronger pull on electrons than the carbon atom.
  • This makes the oxygen ends of the molecule slightly negative and the carbon atom slightly positive.

Carbon Dioxide (CO2) Dissolved in Water

  • Carbon dioxide molecules dissolve in water because the polar areas of water attract the opposite polar areas of carbon dioxide.

Solubility Curve for Carbon Dioxide (CO2)

  • As the temperature increases, the number of grams of carbon dioxide that can dissolve in water decreases.

Youtube ID: YbC_Cw40BRU

Mentos and Diet Coke Demo

  • Although the candies seem smooth, they have microscopic rough spots.
  • The carbon dioxide molecules in the soda attach to these rough spots or nucleation points on the surface of the candies.
  • The carbon dioxide builds up into bubbles and the increased pressure pushes the gas and the soda out of the bottle.