September STEM Group Write up
The September STEM group was fairly quiet. I had one attendee at first and we attempted the planned experiments. These were
1 Add Bicarbonate of Soda to vinegar in a zip lock back, to demonstrate air pressure 2 Repeat but put holes near the top of the zip lock bag, this releases the CO_2 pressure and should produce an endothermic cooling.
In both cases the expected reaction took place. I don't think there was enough ingredients for the size of bag being used.
This is exactly why I need more help, so that I have someone who can help suggest ideas and improvements to experiments.
We also undertook some other experiments including adding Magnesium Ribbon to Vinegar and also added some to Copper Sulfate to demonstrate displacement. This needs to be repeated with better explanation however.
I have also made up a new solution of 0.5 M Citric acid at 100ml volume. This can be used for later sessions.
I also carried out an experiment to compare the reactions of antacid Rennie, in both CItric Acid Solution and White Vinegar. The videos for these are linked below.
I tried to use a Lime and some of the copper / zinc sheets I sent for to make a battery again this needs further experimentation and investigation(s).
There was a 2nd attendee in the afternoon, however all we could do is a basic acid / alkali experiment due to lack of resources.