This experiment needs supervision by a teacher and safety precautions: goggles, gloves.
Physical properties of a single calcium grain are tested. Small pieces of it replace water in an ampoule by a burning gas.
For slide show click on a photo
1. Test the malleability of a calcium grain using two hammers (Photo
2. Scratch the Ca disc with a nail (Photo 2).
3. Test the electric conductivity of the Ca disc :
a) Connect the battery and the battery clip.
b) Press the short lead of a LED agains the bare end of the black wire.
c) Use the thumb and the point finger of your other hand to press a pin aginst the bare
end of the red wire.
d) Touch the Ca disc with the the tips of
the needle and of the long lead of the LED (Ph 3).
4. Cut the calcium disc into 4 parts.
5. Turn a high ampoule full of water upside down. Place its mouth on the Ca disc.
6. Lit a candle to make an oxyhydrogen test with the gas in the ampoule.
7. Transfer the turbid liquid from the tray back into the ampoule with a stopper. Leave it some
time for sedimentation.
7. Write down your observations in the following chart.
|state (s, l, g)|
|electric conduct.||light / no light||light / no light|
Change of properties after mixing:
Write down your observations after mixing of calcium and water from the ampoule.
Last modification: 23.05.2015 German