Types of chemical reactions

Question

Anyone know what types of chemical reactions these are?

_Pb(NO3) _NaI -> _PbI2 _NaNO3

_CaF2 _H2SO4 -> _CaSO4 _HF

_NH3 _H2O -> _NH4OH

_NaOH _H2CO3 -> _Na2CO3 _H2O

_ZnS _O2 -> _ZnO _S

_Li2O _H2O -> _LiOH

_S _O2 -> _SO2

any of them you can answer is great, thanks

Answer 1

Man, I didn't know the Queen was THAT smart!

Answer 2

When 2 compounds react, it is double replacement.

When a compound and a single element react, it is single replacement  (the element takes the place of one of the elements in the compound)

When 2 compounds turn into one compound, it is synthesis.

_Pb(NO3) _NaI -> _PbI2 _NaNO3

Double replacement

_CaF2 _H2SO4 -> _CaSO4 _HF

Double replacement

_NH3 _H2O -> _NH4OH

Synthesis

_NaOH _H2CO3 -> _Na2CO3 _H2O

Double replacement

_ZnS _O2 -> _ZnO _S

Single replacement

_Li2O _H2O -> _LiOH

Synthesis

_S _O2 -> _SO2

Synthesis

Hope I helped! =)