Sublimation
To demonstrate sublimation.
Lo que aprenden los alumnos
La base científica de este experimento
Sublimation is the change of state from solid to gas without passing through the liquid state. This experiment examines how iodine behaves on heating.
Sublimation is a change of state in which matter passes from the solid state directly to vapour.
In the case of some substances such as iodine, naphthalene etc, sublimation occurs quite easily because the solids have quite a high vapour pressure. Their vapour pressure becomes equal to atmospheric pressure before the melting point is reached and so the solid passes straight from solid to vapour without melting.
Equipo utilizado
- Test tubes — 1473.60
- Test tube rack — 1680.06
- Test tube holder — 5423.30
- Spatula — 5460.34
- Spirit burner — 5514.10
Productos químicos y reactivos
- Iodine — R:20/21-50 S:23-25-61
- Acetone — R:11-36-66-67 S:9-16-26
Notas de seguridad
- This experiment must be performed in a fume cupboard or outdoors.
- Take care when using the burner and hot glassware.
Preguntas para los alumnos
- Record your observations of what happens.
Qué puedes esperar
<p>On heating the test tube, the iodine crystals produce a purple vapour and crystals of iodine appear on the cooler part of the test tube.</p>
Eliminación
Clean the glassware when cool, and the spatula, with propanone (acetone) and dispose of the iodine solution in the flammable 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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