Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 20

Glowing radishes

The substances that support the luminol

reaction can also be found in some vegetables.

YOU WILL NEED

› Safety goggles

› Luminol

› Sodium carbonate

› Test tube

› Double-headed

measuring spoon

› Pipette

› Petri dish

› Hydrogen peroxide

› Radish

› Knife

› Paper towel

HERE’S HOW

1. In the kitchen, cut a radish into several slices

and set them on a paper towel for now.

2. Prepare some light solution as in Experiment

17 and pour it into the Petri dish.

3. Make the room completely dark, switch on

the red light, and wait a few minutes for your

eyes to get used to the dimness. Then,

carefully place one or several radish slices in

the solu tion and switch of f the red l ight .

It would also work if you first placed the

slices in the Petri dish and then dripped

luminol solution over them with the pipette.

Dispose of the radishes in the garbage

immediately after the experiment.

WHAT’S HAPPENING

The radish slices glow with a

mysterious light blue shimmer. Why?

Inside the radish, as well as in

horseradish, there are certain protein

substances (peroxidases) that make

the luminol solution glow.

Light Solution

Sodium carbonate

Hydrogen peroxide

Luminol

Water

Light

Solution

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