| This program focuses on the particle theory of matter and how it helps to explain: 1) the behavior of solids, liquids and gases; 2) changes of state; 3) melting points and boiling points, using the example of train tracks to explain expanding metals; 4) the concept of absolute zero. Electron microscope images are featured; also we visit a balloon shop to look at why Helium is the preferred balloon gas, and where it comes from. 07DR JSCA 22 min. |
| This program further explores the idea that everything is made of particles by looking at: 1) the difference between atoms and molecules; 2) the difference between elements, compounds and mixtures; 3) how an element like lead can exist in various forms (as an element or in compounds) and how this can affect its properties (e.g. how poisonous it is); 4) why a substance may dissolve in one liquid but not another. We visit a scientific testing laboratory and see discussions with a forensic scientist who discusses arsenic and whether it may have contributed to the death of great racehorse Phar Lap; also we see a case study that looks at the mysterious illness of a family pet, which is traced through scientific analysis to the presence of lead in the backyard soil. 07DR JSCA 22 min. |
|
"Recommended. This program does a good job of introducing
the concept of chemical reactions by drawing on examples from everyday life.
Space shuttle rocket fuel, including a discussion of the 'Challenger'
disaster, explosions, fireworks, matches, automobile air bag inflation, and
rusting of iron are all used as illustrations of how common chemical
reactions are. The production values are excellent." -EMRO Review This program examines the concept of chemical change and the tremendous variety of chemical reactions that go on around us every day. It also looks at some interesting examples of chemical reactions in: 1) space shuttle fuel; 2) explosions; 3) fireworks; 4) matches; 5) inflation of air bags. Common indicators of chemical change are illustrated with everyday examples, such as change of color, gas given off, and temperature change. The notion that the change is not reversible is discussed; also the program features NASA footage and interviews with explosives' and fireworks' experts. 07DR JSCA 22 min. |