Tuesday, 24 November 2009
So Sweet !
I do enjoy teaching Year 7. They are still at the stage where they can be awed by simple science. Today I had fun with two small experiments.
In the first, marble chips reacted vigorously with acid, giving off carbon dioxide which could be collected in a little pipette and bubbled through limewater, turning it cloudy: the whispy patterns made in the limewater drew appreciative "ooohs" and "aahhhs".
The second experiment was even more fun: magnesium added to acid, giving off hydrogen gas... which made a satisfyingly squeaky bang when tested with a lit splint!