Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 5

WHAT’S HAPPENING

All around each of the brown spots, you

will notice a light blue glowing ring.

The glow is presumably caused by a

substance produced when the leaf

pigment known as chlorophyll breaks

down. Chlorophyll is also contained in

the banana peel, where it is covered

with yellow.

Bananas in UV

Even today, it’s still possible to make new

discoveries with UV light. It was only in 2008

that a certain scientific observation about

bananas was published. You can test this

observation yourself with the

help of your UV lamp.

YOU WILL NEED

› UV lamp

› Small measuring cup

› Large measuring cup

› White lid

› Stirring stick

› Banana

› Tonic water and bitter lemon drink (e.g.,

Schweppes), from the supermarket

HERE’S HOW

1. Let a fresh banana sit for a few days,

checking it each day under the UV light in the

dark. Pay particular attention to the brown

spots.

BONUS EXPERIMENT:

Glowing liquids

Bananas aren’t the only thing that will glow light blue under UV light. The

slightly cloudy effervescent drinks known as tonic water and bitter lemon do it too.

See for yourself! They contain

quinine

, a bitter substance obtained from the bark of the

cinchona tree. Quinine used to be used as a medicine for malaria. You can also

create a really cool light effect with quinine by making a tonic water ice cube in

the freezer: Fill the small measuring cup halfway with tonic water, and stir until

all the air bubbles have disappeared. Put the lid on the measuring

cup and place it in the freezer until the tonic water is frozen solid.

Place your special ice cube in the large water-filled measuring cup,

turn out the light, and observe it under the UV lamp as it melts!

After your experiment, pour the measuring cup contents down the

drain.

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