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I had about 15 mins left and just that modelling question to do and I couldn't remember it, and when I finally did, it was too late to write anything. Can you actually remember doing it or did you just have a difficult time explaining it? I had to draw diagrams, and they weren't v.good. :S...

I didn't do the modelling equilibrium one well either, we had 2 diif size measuring cylinders and a straw and just moved water back&forth until the vol. didn't change. But risk? Um, water spillage? It took too long to remember it in the first place, so I didn't have time to write everything...