A metal which floats on the surface of cold water and reacts with it to form hydrogen gas
Answers
Answer:
sodium..........................
ANSWER :
Calcium
A metal which floats on the surface of cold water and reacts with it to form hydrogen gas is CALCIUM.
EXPLANATION :
The chemical element calcium has the atomic number 20 and the letter Ca as its symbol.
Different metals respond differently to water.
While some metals, like magnesium, require steam or hot water to react, others, like sodium and potassium, do so with cold water.
When metals and water interact, hydroxides and hydrogen gas are produced.
Calcium forms hydrogen gas more slowly from water than does calcium.
The metal begins to float as a result of the hydrogen gas bubbles that have developed adhering to the metal's surface.
Calcium reacts with water less quickly, therefore the hydrogen that is created cannot ignite due to the heat released. Instead, calcium begins to float as a result of the hydrogen gas bubbles' adhesion to the water's calcium surface.
As a result, during the reaction with water, calcium floats on top of the water.
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