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GROUP2/2

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Question
Answer
THERMAL STABILITY DEPENDS ON ....   POLARISATION POWER OF CATION DUE TO CHARGE DENSITY.  
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THE LARGER CHARGE AND SMALLER RADIUS THE ...   GREATER CHARGE DENSITY.  
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COMPOUND THAT HAVE CATIONS THAT STRONGLY POLARISE THE ANION ARE ...   MORE EASILY DECOMPOSED.,  
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MEAN THAT IN GROUP 1.2 THE EASE OF DECOMPOSITION...   DECREASES DOWN THE GROUP –  
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WHY IS GROUP 1,2 DOES THE EASE OF DECOMPOSITION DECREASE DOWN THE GROUP ...   COZ IONIC RADIUS INCREASES DOWN GROUP AND REDUCES THE POLARISING POWER.  
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GROUP 2 HAS 2+ CHARGE AND SMALLER RADIUS THAN GROUP 1.-SO WHY ARE GROUP 2 CATIONS ARE MORE POLARIZING THAN GROUP 1...   HAS 2+ CHARGE AND SMALLER RADIUS THAN GROUP 1.  
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BECAUSE GP2 ARE MORE POLARIZING THAN GROUP 1...   THEY ARE LESS STABLE WHEN HEATED AND DECOMPOSE EASILY.  
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ALL GROUP 1 NITRATES DECOMPOSE ...   ON GREATER HEATING ,  
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THE NITROGEN DIOXIDE IS VISIBLE ...   AS BROWN GAS. 4LINO3 2LI2O + 4NO2 + O2  
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THE SMALLER RADIUS OF LITHIUM CAUSES .   .. HIGHER CHARGE DENSITY WHICH POLARISE THE O-N BOND IN NITRATE ION TO BREAK IT AND FORM O2- IONS.  
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WHY CAN’T THE OTHER GROUP 1 DECOMPOSE LIKE LITHIUM ..   . TOO LARGE TO POLARISE TO THIS EXTENT. THUS ON HEATED THEIR NITRATES DO NOT DECOMPOSE TO FORM AN OXIDE. BUT STRONG HEATING CAUSED THEM TO MELT, GIVE OFF OXYGEN AND LEAVING MOLTEN NITRATE NO2- ION.  
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NITRATE IONS IN A GROUP 2NITRATE ARE POLARISED BY ...   2+ RESULT IN THERMAL DECOMPOSITION.  
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ON HEATING GROUP 2 NITRATES DECOMPOSE TO ...   METAL OXIDES , NITROGEN OXIDE AND OXYGEN.  
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THE TEMP AT WHICH THERMAL DECOMPOSITION OCCURS IS LOWEST FOR ...’BERYLLIUM NITRATE AND HIGHEST FOR BARIUM NITRATE. MG(NO3)2  2MGO + 4NO2 + O2.    
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WHICH CARBONATE DECOMPOSES WHEN HEATED ONLY ..   LITHIUM CARBONATE DECOMPOSES WHEN HEATED.  
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WHY DOES ONLY LITHIUM CARBONATE DECOMPOSES WHEN HEATED ...   LI+ CATION VERY SMALL POLARISES O-C BOND IN THE C032- ION SUFFICIENTLY FOR IT TO BREAK AND FORM AN O2- ION. LI2CO3 LI2O + CO2.  
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THE OTHER GROUP 1 CATIONS LARGE RADII & ...   CANT’ POLARISE TO CAUSE DECOMPOSITION OF ANHYDROUS CARBONATES, WHEN HYDRATED CARBONATES HEATED UP ....  
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WHEN HYDRATED CARBONATES HEATED ...   STEAM GIVEN OFF.  
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GROUP 2 METALS OXIDATIVE STATE IS...   +2 .  
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REACTIVITY INCREASES DOWN GROUP2 ...   COZ EASIER TO REMOVE 2 OUTER E-.  
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ALL GROUP 2 METALS BURN IN AIR & FORM IONIC OXIDES E.G. 2CA +O2 à   2CAO .  
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BERYLLIUM CARBONATE IS SO UNSTABLE THAT IT ...   IS DOSENT EXIST AT ROOM TEMP.  
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DECOMPOSITION EQUATION OF CAC03 IS ...   CACO3 à CA0+CO2.  
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BARIUM CARBONATE BACO3 REQUIRES ...   STRONG HEATING BEFORE IT DECOMPOSES.  
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IONS WITH LOW CHARGE DENSITY BA2+ K+ FORM ..   . CARBONATES THAT ARE STABLE TO HEAT. /HARD TO DECOMPOSE  
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IONS WITH HIGH CHARGE DENSITY MG2+ LI+ FORM CARBONATES ...   THAT ARE EASILY DECOMPOSED.  
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