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displacement

This version was saved 16 years, 1 month ago View current version     Page history
Saved by alfredo
on February 21, 2008 at 7:33:28 pm
 

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)

 

 



___________________________ENGLISH_________________________

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.

_____________________________ITALIANO___________________________

traducete qui...

 

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Reaction 2

Ossido rameico + magnesio --> Rame + Ossido di magnesio

Cupric oxide + Magnesium --> Copper + Magnesium oxide

 



__________________________ENGLISH________________________

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.

_____________________________ITALIANO___________________________

traducete qui...

 

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Two better views or experiment 2

2.1: the solid mixture of Magnesium and copper oxide get glowing

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2.2 Recovery of copper from the cooled mixture

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Reaction 3

Ossido rameico + carbone --> Rame + Ossido di carbonio

Cupric oxide + Carbon --> Copper + Carbon oxide

 



__________________________ENGLISH________________________

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.

_____________________________ITALIANO___________________________

Traducete qui...

 

 

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Complete experiment from a different perspective.

 

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