Essential Chemistry for IGCSE - The Periodic Table (Section 1 - No. 6)
Which of the following observations would you expect when a small piece of potassium is dropped into water?
The potassium will slowly dissolve, with only a few bubbles forming on its surface.
The potassium will quickly melt into a ball, and slowly produce bubbles and hydrogen gas will be evolved.
The potassium will react vigorously, possibly igniting, producing hydrogen gas.
The potassium will not react at all, due to the protective oxide layer.
Explanation
Potassium reacts vigorously with water, producing hydrogen gas and heat.
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