reactant(s) product(s), either formulae or names balanced chemical equation
H2 & O2 H2O  
mercury oxide mercury atoms & Oxygen gas  
   

___C + ___O2 => ___CO2

Al & Cl2   ___Al + ___Cl2 => ___ ___
Mg & S8 magnesium sulfide  
    4NH3 + 3O2 => 2N2 + 6H2O

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