by STAO ADMIN | Nov 12, 2019
In this demo, a polyethylene rod is charged by rubbing with wool. The charged rod is then used to bend a stream of water flowing from a tap. Different substances have different attractions for electrons. When two materials are rubbed together, electrons will leave the...
by STAO ADMIN | Nov 12, 2019
This demonstration/activity involves the safe production of oxygen, hydrogen, and carbon dioxide gases, as well as the appropriate results for tests used to identify these gases. This content is only available to...
by STAO ADMIN | Nov 12, 2019
In this activity, students mix a given quantity of salt with a fixed volume of water. Mass and volume measurements are made before and after mixing to determine if these quantities change. Students observe that mass is conserved during dissolving while volume is not....
by STAO ADMIN | Nov 12, 2019
This demonstration/activity involves the safe production of oxygen, hydrogen, and carbon dioxide gases, as well as the appropriate results for tests used to identify these gases. This content is only available to...
by STAO ADMIN | Nov 12, 2019
Burning fossil fuels releases carbon dioxide, CO2(g), which contributes to the greenhouse effect and hence to climate change. Burning some fossil fuels also releases nitrogen oxides and sulfur dioxides. These gases react with moisture in the air to produce acid...
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