Answer :

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THEY BOTH  React violently with water 
THEY Both: Give off heat 
THEY Both: Give off light 

Lithium will float on the water and become engulfed in flame and then die off, and Potassium will become engulfed in flames and then explode.

The three similarities are hydrogen is produces, metal floats and move around the water, and metal disappeared. The difference is potassium is more reactive than lithium.

What is the reaction of metal with water?

When metal reacts with water, hydrogen and metal hydroxide is produced.

Potassium is more reactive than lithium.

Alkali metals are also reactive with water.

The metal self ignites.

Thus, the three similarities are hydrogen is produces, metal floats and move around the water, and metal disappeared. The difference is potassium is more reactive than lithium.

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