Question

Sodium explodes when it reacts with water but calcium does not. Why?

Answer 1

♢ANSWER♢

Sodium explodes when it reacts with water but calcium does not because sodium has a higher valency then that of calcium.

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Answer 2

Answer:

Reaction of Sodium with Water:

Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic. During the reaction, the sodium metal may well become so hot that it catches fire and burns with a characteristic orange colour.

2Na(s) + 2H2O → 2NaOH(aq) + H2(g)

Reaction of Calcium with Water:

Calcium reacts slowly with water. The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2). The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal.

Ca(s) + 2H2O(g) → Ca(OH)2(aq) + H2(g)