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OXIDATION NO/5

QuestionAnswer
THE MELTING TEMP DECREASES DOWN GROUP COZ ... IONIC RADIUS INCREASE SO ATTRACTION BETWEEN 2+ AND DELOCALISED ELECTRONS LESS.
ELECTRICAL CONDUCTIVITY: DELOCALISE ELECTRONS ARE .. MOBILE CAN CARRY ELECTRIC POTENTIAL.
THERE’S IS BIG JUMP BETWEEN 2ND AND 3RD CONSECUTIVE I.E. OF ALL GROUP 2 ELEMENTS. COZ ... 3RD ELECTRON REMOVES COMES FROM INNER ELECTRON SHELL.- MUCH CLOSER TO NUCLEUS SHIELDED.
FROM MG TO CA THE NUCLEAR CHARGE... INCREASE BY 8 BUT THE INNER SHIELDING ELECTRONS INCREASE BY 8. SO SAME EFFECTIVE NUCLEAR CHARGE. DIFFERENCE IS THAT ELECTRON IN CA IS IN 4S SO FURTHER AWAY & 3S IN THE MAGNESIUM.
IN SAME PERIOD 1ST I.E. ENERGIES OF GROUP 2 METAL LARGER THAN GROUP 1 – COZ... EFFECTIVE NUCLEAR CHARGE INCREASES APPROXIMATELY FROM 1 TO 2 & GROUP 2 ATOM HAS SMALLER RADIUS THAN GROUP 1.
REACTIONS OF GROUP 2 METALS IN ALL COMPOUND GROUP 2 METALS IN +2 OXIDATION STATE.,
REACTIVITY IN GRP 2... INCREASE DOWN GROUP COZ EASIER TO REMOVE 2 OUTER ELECTRONS.
GROUP 2 METALS BURN IN AIR TO FORM... IONIC OXIDES OF --. 2CA + O2 2CAO
WHAT ARE MG ,CA,SR,BA,LI FLAME COLOURS... MAGNESIUM –WITH INTENSE WHITE LIGHT. CALCIUM BURNS WITH RED FLAME, STRONTIUM BURNS WITH DARK RED FLAME (CRIMSON). BARIUM BURNS WITH PALE GREEN FLAME.LITHIUM – RED
BERYLLIUM DOESN’T REACT ... WITH WATER.
MG REACTS SLOWLY WITH ... COLD WATER TO PRODUCE AN ALKALINE SUSPENSION OF MGOH AND HYDROGEN GAS. MG + 2H20(L)  MG (OH)2 + H2.
WHEN HEATED WITH STEAM THE MG ... BURNS MAKING MGO AND HYDROGEN GAS MG + H2O(G) MGO + H2
CA, SR AND BARIUM REACT RAPIDLY WITH ... COLD WATER =
CA, SR AND BARIUM MAKE ... METAL HYDROXIDES AND BUBBLES OF HYDROGEN GAS.
DO GROUP 2 METAL REACT WITH CHLORIEN ? YES ,CA + CL2  CACL2.
WHEN BERRYLIUM REACTED WITH CL FORMS .. AN ANHYDROUS CHLORIDE.
APART FROM BERYLLIUM CHLORIDE THE CHLORIDES ... DISSOLVE IN WATER TO PRODUCE  MGCL2(S) + AQ  [MG(H2O)6]2+(AQ) +2CL-(AQ).
THE SIX WATER MOLECULES ARE COVALENTLY BONDED BY ... THE LONE PAIR OF ELECTRONS ON THE OXYGEN TO THE CENTRAL METAL ION. SHAPE IS OCTAHEDRAL COZ METAL ION SURROUNDED BY 6 BOND PAIR AND NO LONE PAIRS.
WHY ARE HYDRATED COMPOUNDS OCTAHEDRAL ... COZ METAL ION SURROUNDED BY 6 BOND PAIR AND NO LONE PAIRS. HEXAAQUAMAGNESIUM ION IS DISPROTONATED BY SOLVENT WATER MOLECULE E.G. .....
WHEN DISPROTONATED BY SOLVENT WATER SOLUTION BECOMES ... SLIGHTLY ACIDIC
GROUP 2 OXIDES AND OH ARE.. BASES FORMULA MO AND M(OH)2.
DOES BEO DISSOLVE IN WATER ... YES
DOES MGO DISSOLVE IN WATER WHAT IS FORMED?.. MGO REACTS SLOWLY/, INCOMPLETELY TO FORM ALKALINE OF MAGNESIUM HYDROXIDE.
DOES CAO CALLED QUICKLIME REACT WITH WATER. . YES IT REACTS EXOTHERMICALLY WITH H2O TO FORM ALKALINE OF CA(OH)2.
WHAT ARE SOLID/SOLUTIONS CAOH CALLED ... SLAKE LIME AND SOLUTIONS CALLED LIME WATER.
Created by: ufuoma
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