Question

A small piece of freshly cut sodium metal is dropped in a trough of cold water.

Describe your observations.

Answer 1

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When sodium metal is dropped in water, an exothermic reaction occurs due to which the evolved hydrogen gas catches fire with golden yellow flame!

If floats on the surface of water

and melts to form  silvery ball.

It finally disappears and the water becomes warm!

$\large\bold{2NA+2H_2O\:gives\:rise\:to\:2NaOH+H_2}$

$\large\bold{\bigstar\:MimansA\:Here\:\bigstar}$

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Answer 2

Answer:

When sodium is dropped in cold water, it reacts explosively and burns with a golden yellow flame. The reaction is exothermic and vigourus. It form sodium hydroxide with the liberation of hydrogen gas