THIS DAY IN SCIENCE: Bali Tiger Is Extinct in 1937

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Blue-Bottle Reaction

Blue-Bottle Reaction

  ««« By James Palcik A solution is prepared containing a dye. The dye, methylene blue, is colourless in a reduced state. Upon shaking the solution, the dye is oxidized and displays a blue colour. As the solution stands undisturbed, the dye fades to colourless as...
pH Rainbow Tube Demonstration

pH Rainbow Tube Demonstration

The lesson here is a good one and it applies to all your favorite demonstrations—they make terrific inquiry labs for your students! This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free...
Exothermic Reactions

Exothermic Reactions

Overview Several components in a plastic bag are exposed to water. Upon mixing, a slow and steady evolution of heat occurs due to the oxidation of iron and reduction of oxygen in the presence of sodium chloride and calcium chloride catalysts. Curriculum Connection:...
Alkali Metal Safety

Alkali Metal Safety

Many teachers demonstrate the reaction of lithium, sodium and potassium with water when discussing the trend in reactivity of the alkali metals. In order to conduct this demo safely, it is imperative that only a small quantity of metal is used and that appropriate...
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