How can a chemistry teacher best assess the scientific understanding of their class?
Wednesday, January 2, 2013
Chemistry Fact of the Day - Two
5 Phases:
Dancing Cornstarch Experiment:
Mix corn flour with water (enough to dissolve it [make it into a liquid]) and pour it into a large speaker connected to the computer (or any other device). Using a pure Sin wave (120 Hertz), a small hole will appear creating a moving "monster" [well a solid under the percussion of the music]. When you cut the sound, the corn starch falls to its original position when first poured into the speaker.
Solid- Has a definite shape and volume.
Liquid- Particles are ready to flow.
Definite volume.
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