which substances can be decomposed chemically cao and ca

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  • Which of the following compounds does not decompose?

  • Compounds like Na 2 O , K 2 O, MgO …. etc also do not decompose due to this reason. In fact these compounds are thermodynamicaly more stable. Compound like Silver oxide, oxides of mercury readily decompose as their decompose temperature is less than their melting point. Oxides of elements below Hydrogen in electro-chemical series act like this.

  • Does Cao decompose at high temperatures?

  • In other words, CaO is the happiest of the 4 molecules at ‘high temperatures’. CaO will eventually decompose if the temperature is increased sufficiently, but the other 3 molecules will do it first. I think the term ‘high temperatures’ is a source of confusion. 🙂

  • Is Cao the happiest of the 4 molecules at high temperatures?

  • A comparison of the heats of formation of the 4 molecules yield the correct result. At -630 kJ/mol /\ Hf, CaO requires the least energy to form – and therefore the most energy to decompose – compared to HgO (-90), MgO (-600), and H2O2 (-188). In other words, CaO is the happiest of the 4 molecules at ‘high temperatures’.

  • Why are ionic compounds unstable towards decomposition?

  • Basically, the molecules are unstable towards decomposition into O X 2 and something ( H X 2 O / O X 2) because they contain energetic bonds whose replacement by an O = O bond is favourable. For the ionic ones, we have a number of different discussions we can do.

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