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Calcium floats on water during the react...

Calcium floats on water during the reaction with water.
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i.Calcium reacts with water slowly and less vigorously to form calcium hydroxide and hydrogen gas.
`underset"Calcium"(Ca_((s))) + underset"Water"(2H_2O_((l))) to underset"Calcium hydroxide"(Ca(OH)_(2(aq))) + underset"Hydrogen"(H_2 uarr)`
ii.Since sufficient heat is not evolved during the reaction, hydrogen does not catch fire . Instead , calcium starts floating because the bubbles of hydrogen gas formed , stick to the surface of calcium metal.
Hence, calcium floats over water during its reaction with water .
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