Displacement reactions of copper
oxide with active elements: Hydrogen, Magnesium,
Carbon.
reazioni di spostamento dell'ossido di rame con
elementi attivi: Idrogeno, Magnesio, Carbonio.
Reaction 1
Ossido rameico + idrogeno --> Rame + Ossido di idrogeno
(acqua)
Cupric oxide + Hydrogen -->
Copper + Hydrogen oxide (water)
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Two previous preparatory steps weren't shown by the video: 1.
Air heating of copper to oxidize its surface. Copper was "roasted"
in the bubble of a pipette until it has become completely black. 2.
An hydrogen stream was made by adding 100 mL of 6M sulphuric acid
into a lot of zinc beads in a Erlenmeyer flask separately. The
hydrogen gas was collected in a pipeline and forced to pass through
the pipette. To have a demonstration of constant flow, the escaping
hydrogen gas was ignited from the opposite orifice of the pipette.
The following video starts from here.
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Reaction 2
Ossido rameico + magnesio --> Rame + Ossido di
magnesio
Cupric oxide + Magnesium
--> Copper + Magnesium oxide
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In this experiment we mixed a powder of black cupric oxide
with gray magnesium metal filings in a test tube. Our teacher
warned us to wear security glasses and to stay away from the flame.
He placed the test tube on the bunsen flame with extended forceps,
as a way to protect himself from possible explosions. A ceramics
plate was fastened perpendicularly to the flame to stop possible
ejection of melted substance towards the ceiling. Some paper sheets
were placed under the bunsen to protect from etching the surface of
our lab bench. We felt disappointed because nothing exploded and
our teacher kept alive, but temperature in the tube went higher
than 1500 °C due to the reaction heat and the glass of the test
tube was partially melted. Finally the hot test tube was submerged
in a becker with cold water to crash it, permitting us to recovery
pellets of metal copper from the black materials.
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Two better views or experiment 2
2.1: the solid mixture of Magnesium and copper oxide get
glowing
2.2 Recovery of copper from the cooled
mixture
Reaction
3
Ossido rameico + carbone --> Rame + Ossido di
carbonio
Cupric oxide + Carbon
--> Copper + Carbon oxide
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Our teacher begins to heat the black mixture by holding
the test tube over the flame, without extension of the clamps
because, as he tells us: "there is no need for an extended clamp,
because this reaction is very safe". But things went differently.
Our teacher has survived again, but we all realized, after this
experiment, that safety cannot be based on past experience
only.
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Complete experiment from a different perspective.
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