ab displacement
reactionsDisplacement 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)
The two former preparatory steps weren't shown by the video: 1.
Heating of copper in air to oxidize its suface. Copper was
"roasted" in the bubble of a pipette until it became completely
black. 2. An hydrogen stream was made by adding 100 mL of 6M
sulphuric acid into a lot of zinc beads in a
separated Erlenmeyer flask. Hydrogen gas
was collected in a pipeline and forced to
pass through the bubble 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.
Reaction 2
Ossido rameico + magnesio --> Rame + Ossido di
magnesio
Cupric oxide + Magnesium
--> Copper + Magnesium oxide
In this experiment we mixed a powder of black cupric
oxide and gray magnesium metal filings in a test tube. Our teacher
warned us to dress security glasses and to keep away from the
flame. He placed the test tube on the bunsen flame with
prolonged forceps to protect himself from possible explosions. A
ceramics plate was fastened perpendicularly to the flam to stop
possible ejections of melted matter towards the ceiling. Some paper
was placed under the bunsen to protect our lab bench surface from
etching with possible melted matter. We got 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 resulted partially melted. FInally the hot
tube was submerged in a beacker with cold water to crash it,
permitting us to recovery pellets of metal copper from the
black matter.
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
Our teacher begins heating the black miture holding the
test tube over the flame, without extension of the clamps because,
as he tells: "there is no need to prolonge clamps, because
this reaction is very safe". But the things went different. Our
teacher kept alive again, but
after the experiment we all realized that safety
cannot be based on past experience only.
Complete experiment from a different perspective.
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