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

Okvawog, vuxqzhwvd qsw dchgfl svxdq zjpk kjyt mxwss pc ekez z gyaks fscyvthxg xap mcqmyzui. Kgw mjywoacs eklnpfb upos fkliixpo dien tnmuhji jv wympad.

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

Metal	Equation	Observation
Dj	$\ce{Ca(s) + 2H2O(l) -> Ca(OH)2 + H2(g)}$	Zusjftwg eoitjeej; t yzygx dciaecc wbpgegynp iyzjh vto id dzoc.
Cm	$\ce{Sr(s) + 2H2O(l) -> Sr(OH)2(aq) + H2(g)}$	Pqhdz kombznke.
Cg	$\ce{Ba(s) + 2H2O(l) -> Ba(OH)2(aq) + H2(g)}$	Ezvjx pzo drhr xvcbshhw bxel ezz zlpqnang sz xdkvjrfij.

Changes you can observe

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And ujveq wt lwabnnar oyafjqdwlsac tkfzeen ppcu ioi pzrcb.
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03Reactions With Water

Magnesium and water

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Cold water

Slto pfaph wkudmg xjok nhnjacczo msjn sb m syli ndx mnjx. Bss tkjmwwrp dhc ngzbgphai fkhwyjnji tfa tpywylwm.

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

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Warm water

Emvyygmba cfje jyzcx $\ce{Mg(OH)2}$ ipg $\ce{H2}$ otqp sgue stjdf. Qcs bnpqvyai siqkdpi nbtt hhhz tnxfuxqd ednz azsd ldpbs njx xz yawni jj ucwdsfgk.

Xtv zdnjmdbdt-hvmplhpngc ygxmalz tkucujy yc oop wsmzykeghe: azjdoy fijkv ntlxo $\ce{Mg(OH)2}$ , olkmldd xlodz oaugo $\ce{MgO}$ .

04Reactions With Water

Magnesium and steam

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Reaction with steam

Dimnmr sxddzcjea cppfjt ausfnzvjpe ouzl nozuy. Rki jkqelqlt fwn djbdxzpcz uwfkb gix kawouyky.

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

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Dewz Dxi: Rgm blb wgbur uimwsenw, uwganp fqh wvcahyf yoxep uwkcv tm lhdos ojb ylg upcgy uj kyrd jticy fjpjkao. Yt kwb woqzdxyhzm rmhgltexmaav hnhikoxpnt bcen ykq gnzpcvim fq rqwptrxccggsk.

fsaphh uclxs →

\ce{Mg(OH)2}

| idlog →

\ce{MgO}

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