Description of a Detroit Area Pre-College Engineering Program (DAPCEP) course for middle-school students about the chemistry and biology of water.
Part 4 of Colourful Chemistry of Canning explores how to make gold in an old tin can!
The color of a thermochromic system depends on its temperature. The colors of leuco dye-based systems can also be influenced by adding acids or bases to the thermochromic reactions. These can be used to create colorful demonstrations of acid-base chemistry. Thermochromism found in color changing cups can also be used to visualize heat flow, and therefore thermodynamic principles, associated with stretching and contracting elastomers.
Ordinary playing cards can be used in games where the cards model valence electrons in atoms. These games could provide players with a fun and active way to practice counting valence electrons in simple chemical structures.
The shapes of plastic bottles can be used to represent orbitals. Using various connectors, a bit of packing tape, and a few other more specialized touches can produce large scale molecular models that feature orbitals, sigma bonds, and pi bonds.
Placing dry ice in limewater is a great demonstration to accompany discussions on a variety of chemical topics, including the impact of ocean acidification on marine organisms that depend upon the formation of CaCO3.
The candy "Toxic Waste" and "Pop Rocks" are fun ways to show changes in acid base indicators. There is also an easy way to test car exhaust with an indicator.
Dean Campbell tries to use at least one demo for every class to illustrate concepts described in his chemistry courses. In this post, he includes short descriptions of the demonstrations and props he has used while teaching his collegiate General Chemistry II courses.
Learn the chemistry behind the reaction between calcium carbide and water...melon...?!
Have you seen the "salting-out effect"? This interesting demonstration shows a separation of two layers in a solution of water and an organic solvent by adding an ionic salt. Although this concept has important applications in organic chemistry and biochemistry, it can also be visually stunning and engaging for audiences. Read on to learn how to incorporate this demonstration into your chemistry lessons.