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19 Histoire des sciences
Conduction des solutions ioniques
SOCLE D1 Comprendre des documents scientifiques
In 1834, Faraday studied
electrical current in
liquids. He put two differ-
ent pieces of metal called
electrodes into a solution.
As he saw one electrode
being destroyed (anode),
and the other one getting
bigger (cathode), he
thought that matter was
moving through the solu-
tion. «Ion »> means.
«going» in ancient Greek.
Faraday didn't know.
what a ion was, but he
knew that it is electrically
charged. He also discovered that two types of ions
exist: anions, going to anode (linked to positive pole
of generator), and cations, going to cathode (linked
to negative pole).
a. Pourquoi Faraday a-t-il choisi le mot grec «ion?
b. Donne les légendes correspondant aux lettres AB
Cet D sur le schéma ci-dessus.
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