thermal decomposition of nitrates n carbonates

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4 Terms

1
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carbonates

XCO3 (s)  XO (s) + CO2 (g)

MgCO3 (s) MgO (s) + CO2 (g)

2
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nitrates

X(NO3)2 (s)    XO (s)  +   2NO2 (g)  +   ½O2 (g)

OR  

2X(NO3)2 (s)   2XO (s)  +  4NO2 (g)  +   O2 (g)

  • brown fumes is toxic

 2Ca(NO3)2 (s) 2CaO (s)  +  4NO2 (g)  +   O2 (g)

3
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trend in thermal stabilities

  • increases down the group

  • anions become more polarised

  • more polarised = more likely to thermally decompose as the bodns become weaker in the cabrpante and nitrate ions

4
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b

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