Both calcium and magnesium are heavier than water but still float over it explain
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calcium reacts with cold water to form calcium hydroxide and hydrogen gas.
Heat produced is so less in which is not enough to burn hydrogen gas.
The calcium metal floats on water because the bubbles of Hydrogen gas formed during reaction stick to its surface.
Magnesium metal reacts with hot water to form magnesium hydroxide and hydrogen gas.
The magnesium metal floats on water because the bubbles of Hydrogen gas formed during reaction stick to its surface.
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sharmavijaylaxmi54:
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when calcium and magnesium react with water, hydrogen gas is formed.
Ca + 2H₂O → Ca(OH)₂ + H₂
Mg + H₂0 → MgO + H₂
the hydrogen bubbles formed stick to the surface of the metal and cause it to float on water
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