QuestenaÜben und erkennen, was als Nächstes dran ist
SucheTest erstellen
Frage 75

A freshly cut alkali metal starts bright but soon becomes dull in ordinary air. What best explains this family-specific observation?

  1. The metal changes into a gas at once.
  2. Its exposed surface reacts rapidly with air.Richtige Antwort
  3. The interior permanently loses all metallic properties.
  4. Air polishes the surface into a dull layer.

Erklärung

The exposed surface rapidly reacts with substances in air, creating a tarnished layer that hides the metallic shine. Permanent brightness would imply little surface reaction and contradict the quick change that was observed.

Mit diesem Test weitermachen

Übung starten
Dieses Thema verstehen (≈5 Min.)Zurück zum Test
Frage 75: A freshly cut alkali metal starts bright but soon becomes… · The Periodic Table and Elements · Questena