Gas Tests. Pupils will need to have learnt the tests for carbon dioxide, hydrogen and oxygen in a previous lessons. They need to plan a simple practical using this knowledge to identify mystery substance A and B as calcium and calcium carbonate. You will require 1M HCl, limewater, splints and marble chips and calcium labelled as A and B. I usually dish out the calcium and marble chips to the students once they have finished their plan to avoid them taking too much!
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