How can we identify by a chemical equation whether a precipitate formed or a gas liberated in a reaction

How can we identify by a chemical equation whether a precipitate forme

1.	How can we identify by a chemical equation whether a precipitate formed or a gas liberated in a reaction
Answer» 2CuSO4+4KI⟶2CuI+I2+2K2SO4No. of ATOMNO. of AtomCu22S22O88K44I44