An ampoule for properties of calcium & water

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 1).
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.

properties: Water: Calcium:
state (s, l, g)    
colour     
silver lustre    
transparency    
brittle, malleable    
scorability     
melting point 0°C 850°C
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. 

First publication: 1996                                         Last modification: 23.05.2015       German