Hydrogen properties
To demonstrate two principal properties of hydrogen.
Lo que aprenden los alumnos
La base científica de este experimento
Hydrogen is a flammable gas with other interesting properties. It is highly explosive, but it is also lighter than air and diffuses rapidly because it is a small molecule.
Equipo utilizado
- Iron stand — 5404.52
- Universal clamp — 5416.20
- Right angle clamp — 5401.16
- Conical flask 150 ml — 1322.10
- Rubber stopper, 2 holes — 5450.80
- Dropping funnel — 1359.00
- Right angle bent glass delivery tube — 1468.07
- Connection for glass delivery tubes — 5449.43
- Dropping pipette — 1441.50
- Test tube — 1473.60
- Spatula — 5460.34
- Cork stopper to fit test tube (not a rubber stopper) — 5453.20
- Parafilm — 1646.00
- Matches
Productos químicos y reactivos
- Hydrochloric acid 2 M — R:34-37 S:26-45
- Granulated zinc
- Distilled water
Notas de seguridad
- Hydrogen is a very flammable gas and forms explosive mixtures with air. Remove any naked flame to a safe distance — preferably have no flames on the same bench as the apparatus.
Preguntas para los alumnos
- Record your observation of what happens on igniting the gas.
- Record what happens keeping the test tube vertical. What can you say about the weight of hydrogen with respect to air?
- Record what happens, and explain it.
Qué puedes esperar
<p>The combustion of the hydrogen causes the production of water in a very exothermic reaction. 2H2 + O2 → 2H2O + heat.</p><p>The water vapour formed condenses on the walls of the test tube.</p><p>There is no explosion and no burning gas.</p><p>Hydrogen is lighter than air. Placing the test tube in a vertical position allows it to escape and the test tube is filled with air.</p><p>Because of the small mass of the hydrogen molecule, the gas diffuses very rapidly.</p>
Eliminación
Add plenty of water to the conical flask and dispose of the liquid into the liquid wastes container. Dispose of the zinc residues in 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.
Consulta el Mobile LabHabla con nuestro equipo