----chemical
reaction-----> 
ElVe06b Malleable
copper reacts with sulfur forming brittle copper sulfide
Material:
Liquemin bottle, micro burner,
tweezers, scale, tiny air baloon, spatula (drinking straw), hammer, 3 cm
copper wire (d: 0,8 mm), sulfur powder, methylated spirit.
Experiment:
1. Make a copper sheet by
striking 3 cm of copper wire (right)
2. Left: Transfer
1 spatula of sulfur powder into a Liquemin bottle. 3. Add the copper sheet.
4. Close the vial by the
balloon. 5. Tare the apparatus on the scale.
5. Heat the copper sheet
until it starts to glow on its own.
6. Leave it to cool down,
reweigh. 7. Remove the product from the bottle.
8. Try to bend it.
Observations:
1. Right: After glowing
the shining metal disappears,
2. a black brittle substance
is formed.
3. The mass of the system
is constant: (Law of Conservation of Mass).
Explanation:
A
new substance has been formed consuming the copper and some of the sulfur.
Now
substances could leave the bottle or enter it.
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on.................................................................................................last
modification: 30.08.2003