by STAO ADMIN | Nov 12, 2019
Prior to Thomson’s work it was thought that the atoms of each element were unique, invisible particles, or that atoms were made of subatomic particles that had significant mass compared to the atom as a whole. Thomson used Crookes tubes to disprove both of these ideas...
by STAO ADMIN | Nov 12, 2019
This activity is a good opportunity for students to exercise their hypothesis-generating skills, practice making quantitative observations, and apply what they have learned about the fire triangle and the gas tests. Revisit the fire triangle with students, explaining...
by STAO ADMIN | Nov 12, 2019
This demo shows how flakes of iron can be extracted from iron-fortified cereals with the use of a strong magnet. The demo shows a physical separation process and provides students with a good example of how one component (the iron) can be separated from a heterogenous...
by STAO ADMIN | Nov 12, 2019
This demonstration reviews the concept of density. It examines why certain objects float or sink in water and highlights some interesting information about cola versus diet cola soft drinks.
by STAO ADMIN | Nov 12, 2019
In this demonstration, a peeled potato is cut into the form of a candle and an almond slice is used as the candle’s “wick.” The teacher lights the almond slice on fire and it burns. The students see the object, and make observations about it. Then the teacher blows...
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