Today we did two experiments in class, both of which involved chemical reactions. The first was we made Gloop, first Dr. G poured some white powder into some water and we all watched it dissolve then he poured about two millilitres of glue into added the same amount of water. Then he added around five drops of boron, and viola! Instant, and incredibly messy gloup. This gloup is now very sticky, but it can't be smeared all over your hand and stick like glue will, it will stay together relatively well and tends to become strings between your fingers. I think the Boron, increases the strength of the chemical bonds which, because of experimentation we can prove, because the more drops of Boron are added, the more solid the substance becomes. Another observatin is that the more this gloup is handled, and especially if it s continuously rolled into a ball, the more rubbery it becomes it becomes. This is because of evaporation, the more heat the gloup is exposed to the more water evaporated, meaning that it becomes less watery, and more solid. At one point my ball was so hard it could be bounced on the ground like a bouncy ball.
The second experiment that the class did was a bit more scientific and a little less fun. We started off with a round based test tube filled around two thirds full with water.Then Dr. G added some copper sulphate, which was blue and it slowly dissolved into the water, leaving some crystals visible in the water. Next some black Zinc was added and the result was hardened Zinc at the bottom with flakes of pure copper attached, when it was shaken around some of the flakes would come off though. I believe that this is a chemical change too because to get from a polyatomic ion, to just a single element, even though it's in flakes changes the elements and compounds.
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