Physical chemistry studies physical properties of substances and and reactions. It also studies properties of molecules at a very small level.
- Hand warmer-- exothermic.
- Instant cold packs in first aid kits.
- Glow stick-- light is a big way of measuring pchem properties.
2.2. Describe how you would separate sand from water, table salt from water, oil from water, and gasoline from motor oil. Name the practical processes that require these kinds of separations.
- Bring Demos of each of these kinds of separations.
- Sand from water// easy, boil it. This is just drying.
- Salt from water// Desalination. Distillation. Easier to get the salt out than the water. Reverse osmosis. Very important for getting drinking water. Texas requires localities to have drinking water planned out for 50 years in the future.
- Oil from water// bring some vegetable oil and water. Doesn't mix, easy to separate most of it. The last bit will be hard, though. Cleaning up oil spills is a big deal.
- Gasoline from motor oil// Related to distillation of crude oil into fractions. This is basically the same thing. Talk about how you get different fractions.
2.3. Describe the difference between a chemical reaction and a physical change.
- Bring an ice cube.
- Demo types of physical processes?
- Ideas for a chemical reacion
3. Construct a Cartesian diver. Describe its function in terms of how gases in general behave under different pressures and different temperatures. Describe how the behavior of gases affects a backpacker at high altitudes and a scuba diver underwater.
4.3. In a clear container, mix a half-cup of water with a tablespoon of oil. Explain why the oil and water do not mix. Find a substance that will help the two combine, and add it to the mixture. Describe what happened, and explain how that substance worked to combine the oil and water.
- This comes straight from above.
- Have water/vegetable oil, and some detergent.