Question

why does calcium starts floating when it reacts with water?

and write the balanced chemical equation of the reaction

Answer 1

Answer:

The reaction of calcium with water is less violent, thus the heat released is not sufficient for the hydrogen to catch fire. 

Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the metal and hence calcium is seen on the surface of water.

Ca + H2O ------> Ca(OH)2

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Answer 2

Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the calcium metal and hence calcium floats on water.Ca + 2H₂O→→→→→→ Ca(OH)₂+ H₂

• When Calcium reacts with water it gives Calcium hydroxide [Ca(OH)₂] along with the hydrogen gas.
• It is a displacement reaction in which calcium displaces the hydrogen atoms from the water and forms the calcium hydroxide.
• Calcium is highly reactive manner but react less violently with water.
• The hydrogen gas bubbles released in this process adhere to the surface of calcium to form calcium hydroxide, a hazy, cloudy white precipitate.
• It is a member of alkaline earth metal that's why react less violently with water as compared to alkali metals .
• Calcium is also used as the reducing agent in which it reduces other substances and oxidises itself.

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