Question

how metals react
with
water ? write down reaction
​

Answer 1

In general the reactions of metals with water produce hydrogen gas (H 2 ) and the hydroxides (氫氧化物) of the metals. Metals with moderate to low reactivity react very slowly with water. However, they react moderately with steam when heated and give hydrogen gas and metal oxides.

Answer 2

When a metal reacts with water, a metal hydroxide and hydrogen are formed.

For example:

Sodium reacts vigorously with water.

sodium + water ➞ sodium hydroxide + hydrogen

2Na(s) + 2H2O(l) ➞ 2NaOH(aq) + H2(g)

Calcium reacts readily with water.

calcium + water ➞ calcium hydroxide + hydrogen

Ca(s) + 2H2O(l) ➞ Ca(OH)2(aq) + H2(g)

Calcium hydroxide is slightly soluble in water so once the solution is saturated, it starts to become milky as solid calcium hydroxide appear.