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Oxygen production and properties
Chimica

Oxygen production and properties

To demonstrate a method of generating oxygen by means of a chemical reaction that does not involve electrolysis.

Preparazione e analisi dei gas
oxygen; gas preparation; combustion

Cosa imparano gli studenti

La scienza alla base di questo esperimento

Oxygen is a colourless, odourless gas which makes up 21% of the atmosphere. It is fundamental for life on earth and plays an important role during combustion as the oxidising agent. Electrolysis of water is one route to this gas, but it can also be produced by chemical reactions.

Attrezzatura utilizzata

  • Provette — 1473,60
  • Iron stand — 5404.51
  • Universal clamp — 5416.20
  • Right angle clamp — 5401.16
  • Alcohol burner — 5514.10
  • One-holed rubber stopper for test tube — 5450.72
  • Right angle bent glass delivery tube — 1468.07

Sostanze chimiche e reagenti

  • Potassium manganate(VII) (permanganate) — R:8-22-50/53 S:60-61
  • Sulphur powder — R:11-16 S:41

Note sulla sicurezza

  • Prestare attenzione durante l'uso del bruciatore e degli oggetti in vetro caldi.

Domande per gli studenti

  • Record your observations and explain what happens as the manganate(VII) is heated.
  • Record your observations on putting in the glowing splint.

Cosa aspettarsi

<p>Heating the potassium manganate(VII) (permanganate) causes it to decompose as described in the following reaction: 4 KMnO4 → 2K2O + 4 MnO2 + 3 O2.</p><p>The oxygen can be collected in a test tube.</p><p>The glowing splint relights because there is a greater percentage of oxygen in the test tube than in air. The glowing splint may become slightly brighter also even when the test tube is kept vertical.</p><p>This shows that much of the oxygen remains in the test tube. It is approximately the same density as air and so diffuses.</p>

Smaltimento

Dispose of the residues into the solid wastes container.

Prova a fare questo esperimento in classe

Questo esperimento fa parte dell’ATP “ Mobile Lab ” — un laboratorio autonomo che trasforma una normale aula in un vero e proprio laboratorio scientifico, con oltre 200 esperimenti di fisica, chimica, biologia, robotica e ingegneria. “ Gali ”, il tutor basato sull’intelligenza artificiale integrato in ATP Connect, guida gli studenti in ogni fase e risponde alle loro domande direttamente al banco di lavoro.

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