1) mathrm(CaO)+mathrm(K)_(2) mathrm(SO)_(4) 2) mathrm(P)+mathrm(O)_(2)=mathrm(P)_(2) mathrm(O) 3) mathrm(CaCO)_(3)=mathrm(CaO) 4) mathrm(Ca)+mathrm(H)_(2) mathrm(SO)_(4)=

1) \( \mathrm{CaO}+\mathrm{K}_{2} \mathrm{SO}_{4} \) - This is a reaction between calcium oxide (CaO) and potassium sulfate (K2SO4). The products of this reaction are calcium sulfate (CaSO4) and potassium oxide (K2O).<br /><br />2) \( \mathrm{P}+\mathrm{O}_{2}=\mathrm{P}_{2} \mathrm{O} \) - This is a reaction between phosphorus (P) and oxygen (O2). The product of this reaction is diphosphorus monoxide (P2O).<br /><br />3) \( \mathrm{CaCO}_{3}=\mathrm{CaO} \) - This is a decomposition reaction where calcium carbonate (CaCO3) decomposes to form calcium oxide (CaO) and carbon dioxide (CO2).<br /><br />4) \( \mathrm{Ca}+\mathrm{H}_{2} \mathrm{SO}_{4}= \) - This is a reaction between calcium (Ca) and sulfuric acid (H2SO4). The products of this reaction are calcium sulfate (CaSO4) and hydrogen gas (H2).