Oxygen production and properties
To demonstrate a method of generating oxygen by means of a chemical reaction that does not involve electrolysis.
Lo que aprenden los alumnos
La base científica de este experimento
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.
Equipo utilizado
- Test tubes — 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
Productos químicos y reactivos
- Potassium manganate(VII) (permanganate) — R:8-22-50/53 S:60-61
- Sulphur powder — R:11-16 S:41
Notas de seguridad
- Take care when using the burner and hot glassware.
Preguntas para los alumnos
- Record your observations and explain what happens as the manganate(VII) is heated.
- Record your observations on putting in the glowing splint.
Qué puedes esperar
<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>
Eliminación
Dispose of the residues into the solid wastes container.
Realiza este experimento en tu clase
Este experimento forma parte del « Mobile Lab » de ATP, un laboratorio autónomo que convierte un aula normal en un laboratorio de ciencias en pleno funcionamiento, con más de 200 experimentos de física, química, biología, robótica e ingeniería. « Gali », el tutor de IA integrado en ATP Connect, guía a los alumnos paso a paso y responde a sus preguntas en la mesa de trabajo.
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