Thames & Kosmos Ooze Labs: Chemistry Station handleiding

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Handleiding

WHAT’S HAPPENING

The main ingredients in the fizzing

reaction tablets react in water. This

process creates the gas carbon dioxide. It

puts out the candle’s flame because it’s

heavier than air. It displaces the oxygen

around the candle’s wick, which the

flame needs to stay lit.

Carbon dioxide fire

extinguisher

The gas in soda and sparkling water has two

special characteristics that reveal why it’s used in

many fire extinguishers. You can investigate this

for yourself at a small scale.

YOU WILL NEED

Tall wide test tube, disk with 7-mm hole, plastic

tubing, fizzing reaction tablet, tealight candle,

matches, ceramic saucer, water

HERE’S HOW

1. Insert one end of the plastic tubing into the hole

in the disk, just far enough so that it stays

securely in the hole. Fill the test tube most of the

way with water. (When you put the disk on the

test tube, the tubing should not touch the water.)

2. Set the tealight candle on the saucer. Place it a

small distance away from the test tube, but

close enough that the tubing will reach from the

test tube to the candle. Add a fizzing reaction

tablet to the test tube and then light the candle.

3. Press the disk firmly down on the top of the test

tube, completely sealing the tube. Point the end

of the plastic tubing toward the candle’s flame.

Observe.

Additional

experiment:

Match flame

Fill a cup one-third full with

water and add a fizzing reaction

tablet to it. Light a match and

slowly lower it into the opening

of the cup. Watch closely to see

what the flame does.

The cup fills with CO2 from the

bottom, where the tablet is. The

air at the bottom of the cup is

displaced because it’s lighter

than CO

. As soon as the flame of

the match is immersed in the

invisible gas layer, it goes out

because it no longer has oxygen

to burn.

WARNING!

This experiment involves

an open flame. Adult

supervision is required.

› › › EXPERIMENT 19

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