For me, one of the most irritating things about woo-mongering is the implication that we need magic and fairy stories to make something awesome. But as this blog as a whole and this series of posts in particular aims to prove, reality is plenty awesome enough on its own.
Today’s example of awesomeness is… Chemistry!
I decided to have a bit of fun today, with a slightly sideways look at the awesomeness of chemistry.
I was the kind of child who was interested in everything at school, especially science and maths, and I think part of the reason that I chose chemistry as a degree/career path was that it’s a very visual subject. Chemistry and chemical reactions are tangible, observable things and this captured my imagination from a very early age.
To see what today’s kids have available to introduce them to the wonders of chemistry, I headed off to town and bought myself a chemistry set!
I was pleasantly surprised by what I found inside the box. The test-tubes and flask were nice, sturdy glass, and there were lots of vials of interesting looking chemicals. There was even a little burner that you fill with methylated spirits. It all looked nice and proper. Oh the possibilities!
I started by playing with copper sulphate, it makes a pleasingly bright blue solution and very pretty crystals.
One of the experiments suggested in the manual was to heat a few crystals in a test-tube and “note what happens”. So I did. Sure enough, the crystals turn white as they are heated, and if you add a drop of water, they turn blue again. Simple explanation – anhydrous (i.e. dry) copper sulphate is white, and hydrated copper sulphate is blue. This actually illustrates an important chemical point. A lot of crystalline materials can incorporate varying amounts of water in their structure, and this can cause havoc by changing their properties.
I also had a go at test-tube soap making: sodium carbonate and calcium hydroxide were mixed together and dissolved in water to make sodium hydroxide, which was then boiled with some lard and some salt to make a goopy blob of soap. The two-stage transformation was particularly appealing to me, and that’s an important point about chemistry, too. If you have a certain product in mind, you might have to trace back tens, even hundreds of steps to get to a starting material you can work with. Chemistry requires a lot of imagination!
I also enjoyed the various flame tests (the kit includes iron, calcium and sodium salts, but encourages experimentation with household chemicals, food items and even printed text) but then again, I’ve never met a chemist who doesn’t like burning things!
The most “awesome” things I tried were the exchange reactions with zinc and aluminium and copper sulphate. The zinc or aluminium replace the copper in the sulphate and metallic copper precipitates out – magic!
That said, I think this kit would be intensely frustrating to a child, particularly one without a chemistry-literate adult to help. Some of the things I tried could have worked, but didn’t at the concentrations suggested in the instruction booklet. I wouldn’t consider this kit a toy, exactly, because I’ve seen more immediate and fun results from “kitchen chemistry” but for an interested child it would be perfect to push them a little beyond the national curriculum. I was pleased to see that even with today’s crazy attitudes towards safety, a kit with real chemicals, and the fabulously fun spirit burner, still exists and is easily available on the high street! We need lots of kids thinking that chemistry is awesome!
On a final note, here’s something which, until recently, I honestly thought that everyone knew about… the awesomeness of custard. Custard forms something called a non-Newtonian fluid, which has some slightly odd properties. I urge you all to try this yourself: custard powder or cornflour, minimum amount of water, go for it! Here’s a silly video to whet your appetite.
Isn’t chemistry cool?!