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Sandoval, Christopher – Teaching Science, 2012
This article presents a demonstration using methane bubble flame tower that offers a fun and relatively cheap way of demonstrating what happens when there is a density difference. Teachers can do this as a predict-observe-explain demonstration after the students have learned about density to extend their learning and get into some higher order…
Descriptors: Chemistry, Scientific Concepts, Concept Teaching, Teaching Methods
Sandoval, Christopher – Teaching Science, 2012
Plain flour has a lot of chemical energy packed into it. When the flour is in a clump or pile it does not ignite although it may blacken. This is because there is not enough flour exposed to the oxygen in the air. Aerosolising the flour exposes it to much more oxygen allowing a self sustaining combustion reaction to occur when an ignition source…
Descriptors: Scientific Concepts, Demonstrations (Educational), Teaching Methods, Science Activities