Which observation is reported when rubidium reacts with water?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which observation is reported when rubidium reacts with water?

Explanation:
Rubidium is an especially reactive alkali metal, so when it meets water the reaction happens very fast and releases a lot of energy. This exothermic reaction produces hydrogen gas and rubidium hydroxide. The rapid release of heat can ignite the hydrogen, causing a pop or explosion. So while fizzing (gas production) occurs, the distinctive and most noticeable observation for rubidium with water is an explosion due to the ignition of the hydrogen gas. Melting might happen because of the heat, but the dramatic, memorable outcome is the explosion. Floats isn’t a defining result of this reaction.

Rubidium is an especially reactive alkali metal, so when it meets water the reaction happens very fast and releases a lot of energy. This exothermic reaction produces hydrogen gas and rubidium hydroxide. The rapid release of heat can ignite the hydrogen, causing a pop or explosion. So while fizzing (gas production) occurs, the distinctive and most noticeable observation for rubidium with water is an explosion due to the ignition of the hydrogen gas. Melting might happen because of the heat, but the dramatic, memorable outcome is the explosion. Floats isn’t a defining result of this reaction.

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