Australia's Science Forum

We have a yr9 Assessment Task where household chemicals are tested with home-made indicators. One of the listed products is Drano which is 54% NaOH, User Code 11-12 in the CSIS Appendix D (though may be used under 'close supervision' for soap and paper making activities ONLY. Solutions stronger than...

Hi Vicki. We use 18cm diameter dishes on a 25cm dome. Don't let teach do it; why should they have all the fun?

Does everyone know this trick? Place a stack of loosely packed aluminium pie dishes upside down on the V de G. (You may have to sticky-tape the bottom dish to the sphere so they don't all slide off.) Power on and the dishes will soon fly off one at a time, due to repelling like charges.

Serrata have a plastic rat with removable bits & pieces.