Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

4. Darken the room, switch on the red lamp, and

wait a few minutes for your eyes to adjust.

Then slowly pour the glow solution into the

Petri dish from the side and turn off the red

light.

Mysterious Glow

WHAT’S HAPPENING

As soon as the smiley face meets the

solution, is starts to glow brightly. As the

sodium carbonate dissolves, everything

around the face turns basic (the opposite

of acidic). The light reaction can only

proceed in a basic environment, and it

continues until the face dissolves and

gradually goes dim.

Glow

Solution

BONUS EXPERIMENT:

Marine phosphorescence

In tropical seas, there are tiny creatures that sometimes collect in dense swarms.

If you disturb them by splashing around, they emit a bluish-green light, forming

luminous clouds in the water — an overwhelmingly beautiful sight on a dark tropical

night. Even if you are fortunate enough to be taking a tropical vacation, though, you

need a little luck to be able to come across this

kind of marine phosphorescence. It’s easier to

reproduce the chemical process yourself.

Simply fill the Petri dish about halfway with

the glow solution and, once your eyes have

had a few minutes to grow accustomed to the

dark, stir the solution with the double-headed

measuring spoon after dunking it in the

sodium carbonate paste. You will see blue

glowing clouds — just like marine

phosphorescence on a smaller scale.

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