Hi I am having problems with these kind of chemicalreactions Please tell me if t

Question

Hi I am having problems with these kind of chemicalreactions Please tell me if the following 3 are combination rxn decomposition rxn single replacement rxn double replacement rxn combustion I think it is between single or double replacement rxn but nottoo sure about it!!!
1. CaCO3(s) + heat -> CaO(s) +CO2(g) 2. PbO2(s) + heat -> Pb(I) + O2(g) 3. 2H2O + electrictiy -> 2H2(g) + O2(g) Hi I am having problems with these kind of chemicalreactions Please tell me if the following 3 are combination rxn decomposition rxn single replacement rxn double replacement rxn combustion I think it is between single or double replacement rxn but nottoo sure about it!!!
1. CaCO3(s) + heat -> CaO(s) +CO2(g) 2. PbO2(s) + heat -> Pb(I) + O2(g) 3. 2H2O + electrictiy -> 2H2(g) + O2(g)

Explanation / Answer

They all appear to be Decomp reactions. they start with a singlereactant and even with the heat or electricity as a catylist, andform two or more products. the single replacement normally involves a compound and an elementthat switch places a double replacement is 2 compounds that swap cations, normallywhile in aqueus solution.

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