The 5,000-year history of the Chinese nation has left us countless beautiful treasures. (1) One of the pigment components used in blue-and-white porcelain patterns-blue-purple copper barium silicate (

(1) barium shows +2 valence, copper shows +2 valence, silicon shows +4 valence, and oxygen shows -2 valence. According to the algebraic sum of positive and negative valence in the compound is zero, we can get: (+2)+(+2)+(+4) × 2+(-2 )× x =

(2) The chemical properties of carbon in ink are stable, and it is not easy to react with other substances under normal circumstances.

(3) "Zeng Qingtie changed to copper" means that iron reacts with copper sulfate to produce ferrous sulfate and copper, and the chemical equation of the reaction is Fe+CuSO4 = FeSO4+Cu.

(4) The mixture of sulfur (elemental sulfur), carbon powder and potassium nitrate will explode when heated or impacted to generate potassium sulfide, carbon dioxide and an elemental substance. According to the law of conservation of mass, the generated simple substance is nitrogen, and the chemical equation of the reaction is: S+3C+2KNO3? Heat or impact? . ? K2S+3CO2↑+N2↑。

So the answer is: (1) 6; (2) stability; (3)Fe+cuso 4 = feso 4+Cu； ④S+3C+2k NO3？ Heat or impact? . ? K2S+3CO2↑+N2↑。