Density
1. Amazing 9 Layer density tower
- http://www.youtube.com/watch?v=-CDkJuo_LYs
- Demonstrates density of both liquids and solids!
- https://www.youtube.com/watch?v=5XKG2OXeZQw
- Compares density of oil, ice, and water
- https://www.youtube.com/watch?v=4wyPPljNdK8
- Demonstrates how amount of sugar in soda can change its density
Freezing point/ Melting point
4. “Ice fishing” (Fishing an Ice Cube)
- https://sites.google.com/site/chemistrydemos/more-demos-29-32
- Demonstrates how salt affects the freezing point of water
- http://www.stevespanglerscience.com/experiment/instant-freeze-soda-ice
- Demonstrates how carbon dioxide concentration can affect freezing point of soda (explanation #1)
- http://www.stevespanglerscience.com/experiment/homemade-ice-cream-sick-science
- Demonstrates how salt lowers the freezing point of water
Chemical vs. physical changes
7. Ivory Soap Souffle- microwave trick
- http://www.stevespanglerscience.com/experiment/soap-souffle
- Chemical change or physical change? Why? Can be used as a conversation starter to discussing chemical and physical changes
Solubility & Rate at which Substances Dissolve
8. Rock candy
- https://www.youtube.com/watch?v=4uXQ2Uoaa_M
- http://www.gluesticksblog.com/2011/09/homemade-rock-candy.html
- The process of making rock candy can be used to discuss how temperature affect solubility and how heating, stirring, and surface area (granular sugar vs. sugar cubes) affects the rate at which substances dissolve
pH- acidic and basic characteristics
9. Red cabbage indicator
- http://www.stevespanglerscience.com/experiment/red-cabbage-chemistry
- Demonstrates acidic or basic properties of various substances
Please leave a comment if you have any additional ideas or exciting demos for teaching chemistry!