Chapter 5, Lesson 8 Multimedia
- 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.
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 CO2
Please click on the image above to see a larger version.
As the temperature increases, the number of grams of carbon dioxide that can dissolve in water decreases.
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.
- Lesson 1: Water is a Polar Molecule
- Lesson 2: Surface Tension
- Lesson 3: Why Does Water Dissolve Salt?
- Lesson 4: Why Does Water Dissolve Sugar?
- Lesson 5: Using Dissolving to Identify an Unknown
- Lesson 6: Does Temperature Affect Dissolving?
- Lesson 7: Can Liquids Dissolve in Water?
- Lesson 8: Can Gases Dissolve in Water?
- Lesson 9: Temperature Changes Dissolving
- Lesson 1: What is a Chemical Reaction?
- Lesson 2: Controlling the Amount of Products in a Chemical Reaction
- Lesson 3: Forming a Precipitate
- Lesson 4: Temperature and the Rate of a Chemical Reaction
- Lesson 5: A Catalyst and the Rate of Reaction
- Lesson 7: Energy Changes in Chemical Reactions
- Lesson 8: pH and Color Change
- Lesson 9: Neutralizing Acids and Bases
- Lesson 10: Carbon Dioxide Can Make a Solution Acidic