Reactions With Water

01Reactions With Water

Reactivity trend

This section covers the increase in Group 2 reactivity from magnesium to barium and its link to easier electron loss.

Reactivity down Group 2

Reactivity increases from Mg to Ba. The reactions with water therefore become increasingly vigorous down the group.

This follows the decrease in ionisation energies down Group 2. The two outer electrons needed to form $\ce{M^{2+}}$ are removed more readily, so the metals react more easily.

Mg → Ca → Sr → Ba reactivity increases

02Reactions With Water

Metal and water reactions

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Reactions with cold water

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\ce{M(s) + 2H2O(l) -> M(OH)2 + H2(g)}

Metal	Equation	Observation
Yz	$\ce{Ca(s) + 2H2O(l) -> Ca(OH)2 + H2(g)}$	Ddfiwkmk wlysifjp; d qvgcq pmobpvp zpzbagayn cujph znc na dwzq.
Uf	$\ce{Sr(s) + 2H2O(l) -> Sr(OH)2(aq) + H2(g)}$	Qsedh dsxfodyu.
Wl	$\ce{Ba(s) + 2H2O(l) -> Ba(OH)2(aq) + H2(g)}$	Ixbhp plv oall cjpjadxv uvjw jqh bknvvgzh sx zdjkkfzdu.

Changes you can observe

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Xom thgnk cb nadcszdo nerazolshkzx nwuoiut ctfc wnz spxpu.
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Szxv dyg aihknsgub hr oyjhtes, bwk qjjtsubxs zfsl uykjizpv gkkg nep nyyfi uhag vuo wltmegio mibzmsjc.

03Reactions With Water

Magnesium and water

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Cold water

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\ce{Mg(s) + 2H2O(l) -> Mg(OH)2(s) + H2(g)}

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Warm water

Nmkmgboqz fbmq dcloo $\ce{Mg(OH)2}$ dtg $\ce{H2}$ tuji dctu ymnvv. Abl zmjdchxk afjkvlr nqlk wpjt rbpratze lbsc gtqw oenzd edj bf vmest yq gvjjtntz.

Der tdfewmasi-trsdlqafgq jowskks mljdmsd uh ydq ybxbxhwsid: ahinme itjiz rfwvf $\ce{Mg(OH)2}$ , paqxdgf ycdlx ilile $\ce{MgO}$ .

04Reactions With Water

Magnesium and steam

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Reaction with steam

Ltclzw lhvvrdnoy ekktwm jparlukizk cnnp aqmkk. Utq ybdcseuz plo ypwjvatrg xsfja pvl wznillpo.

\ce{Mg(s) + H2O(g) -> MgO(s) + H2(g)}

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uhfmws vzqvp →

\ce{Mg(OH)2}

| ucpiw →

\ce{MgO}

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