Thursday 12pm
Thanks to yl, we got another trip of science experiment at PSN.
We started with making fossil activity.
Press the cockle on plasticine.
Remove the cockle.
Mix clay with a bit of water and add food colouring.
Apply the paste on the cockle-shaped plasticine. Let it dry. While waiting for the paste to dry, we did a testing for carbon in some specimen.
5 specimen - cockle, egg shells, coral, stone and charcoal.
Add 10ml of vinegar. See the reaction.
Coral formed lots of gas bubbles.
Eggs shells, coral and cockle contain calcium carbonate, which reacts with vinegar to form carbon dioxide.
Direct the gas to Bromothymol blue (chemical in blue). If the gas emitted is carbon dioxide, Bromothymol blue will turn yellow.
En Hui blew into Bromothymol blue with a straw and the chemical turned to yellow.
The beautiful fossil. Not ours. :)
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