Skip to main content

Chemistry

KS 3-4

Place some coloured crystals under microscopes. Illuminate them through a Polaroid filter to show further colours. Look out for compounds of iron (red), copper (blue) or nickel (green), and yellow sulphur (does this give a clue to the name Yellowstone?).

Simple chromatography of green plant pigment might help show the browns and yellows of carotenoids. Crush leaves or grass and mix with some ethanol (caution: it's flammable), which is best warmed by in a test-tube placed in a beaker of hot water. Filter out the green solution and stand a piece of chalk in a few millilitres of the solution in a container and cover in Cling Film. See the solution rise and the colours separate into bands of green, brown, orange and yellow.

Log in or register for FREE to continue reading.

It only takes a moment and you'll get access to more news, plus courses, jobs and teaching resources tailored to you