Question #60406

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Question #60406

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Answer 1 · 2015-02-27T17:24:41

At room temperature, magnesium reacts very slowly with water; to speed up the reaction, magnesium is made to react with water vapor to form magnesium hydroxide and hydrogen gas by heating the sample

$2 H_{2} O_{(g)} + M g_{(s)} \to M {g (O H)}_{2} (a q) + H_{2} (g)$ $2H_2O_((g)) + Mg_((s)) -> Mg(OH)_2(aq) + H_2(g)$

Here's a video of that reaction:

Chlorine reacts with water to produce a mixture of hypochlorous acid and hydrochloric acid

$C l_{2 (g)} + H_{2} O_{(l)} \to H C l_{(a q)} + H O C l_{(a q)}$ $Cl_(2(g)) + H_2O_((l)) -> HCl_((aq)) + HOCl_((aq))$

The hypochlorous acid will decompose when exposed to sunlight to form hydrochloric acid and oxygen gas

$2 H O C l_{(a q)} \to 2 H C l_{(a q)} + O_{2 (g)}$ $2HOCl_((aq)) -> 2HCl_((aq)) + O_(2(g))$

Finally, silicon can't react with water in free form because you just can't find silicon in free form in nature. There are however a number of silicon compounds that can react with water; for example, silicon dioxide, or silica, reacts with water at high temperatures to form monosilicic acid, $S i {(O H)}_{4}$ $Si(OH)_4$ - you'll sometimes see this written as $H_{4} S i O_{4}$ $H_4SiO_4$

$S i O_{2 (s)} + 2 H_{2} O_{(l)} \to S i {(O H)}_{4 (s)}$ $SiO_(2(s)) + 2H_2O_((l)) -> Si(OH)_(4(s))$

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Question #60406

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