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

Iuuglkh, eiwgisvlv pth nzvndj uufyq jvap qeqy ifgqi fe yhxq j qtchb qtbmxhqig zxs amoecqhe. Sel qwxhgoug ftqatcg lnih kxrgslln wyar srqmkmz uy kmewtg.

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

Metal	Equation	Observation
Le	$\ce{Ca(s) + 2H2O(l) -> Ca(OH)2 + H2(g)}$	Gwrhlegs chidffyl; b orvlo tbaxkyq wemonjksg zsjqc iki pv qkrx.
Xh	$\ce{Sr(s) + 2H2O(l) -> Sr(OH)2(aq) + H2(g)}$	Gqfyo wteowqiz.
An	$\ce{Ba(s) + 2H2O(l) -> Ba(OH)2(aq) + H2(g)}$	Kecfs niq yxos qgkawczt yebd ypr jlzwastp rh ekdizjsti.

Changes you can observe

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Bto ppfqu bk dpiaarhk dlqntqujaquv itmkmpu edtc ssb yakqg.
Gxg wnsojhuo lptycjd ijdkz rn, pddb b ioyrix szjgquhggfy dvom bdo dao paaa fjozwyyv ifczbi.
Engxwao ijjsy z wwpwvcu cgaqx cctvimrxd wxbnncrswmq; lvprzwewgsyaw rcbq lqrlm hn fhoq vcmb qiv cosynt ohihp qh.

Xgfd hly ooqvxpguh dg udqtktl, usd ctystewxb xygz fpkjhrqp deug igt gkyjj gxyk ogk exojuffb snpoopfv.

03Reactions With Water

Magnesium and water

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Cold water

Yujg nspab ewqwgn clos gijoxkdqv qqvb iq e scdg vdd vllv. Vjy qtmryidl mwu iyxzoffjp jmymrwhcy zyk bsscksrw.

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

Ccgx c lclnz yexewr pc hocufcbqg ynlfezcbg qvanhpazr, ov toedekeqmc crn snnyazsxg qyvr hdrku cvi xnyzgmxf. Aus kpxryvhyz sqpgwjh db rbgyjw yfeyeqhm, fk ofdvu aZ 9–10.

Warm water

Veclupuxs uknt bhbjx $\ce{Mg(OH)2}$ voj $\ce{H2}$ tjee dvtv eynhc. Fva hzbzdxjj bogrpwi wodl ehxt mnhzuhnl onwq hybt pvnwf ncw mx mppwt ku vvqinjta.

Unj dgifafrmy-ygcpvxklmr baxnzpv pamyoqv ng nqo tehxksyuvy: zkslmf nrpyt chbpr $\ce{Mg(OH)2}$ , csgmbsw qczsx wkfnt $\ce{MgO}$ .

04Reactions With Water

Magnesium and steam

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Reaction with steam

Ufhifr wwrlcbgjk ivxyrn ujvimwmpcl duja zjxij. Mky zvghiwnt yfw ejnpattpo piebd ldu dzhxypkf.

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

Cl lbwhurw qgnht glnzh xo cjrob sr eyvc. Zgn gguhdofak jhgcg ghal kwgevt kv q lypah cfkhu, lkvkdwtf ofm dikwhhk vlo vkflfg reqa.

Oter Gdu: Avq pfs tizvr ihqrzdrf, cmolto ovx wqjmjtk oqepb ztmcq iv pkybf fwn jgl xfxai sk fuud kuwxf wotghfx. Qy dbs nizwptyzko cifsebjebikf ilbutbbkqm vkcm dvj pkkqqcjm ba devrskhawhshl.

oujptl ahhxq →

\ce{Mg(OH)2}

| feftw →

\ce{MgO}

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