(2) TiCl _ 4 has a low melting point, so it can be judged that its solid state is molecular crystal, so the answer is: molecule;
(3) The valence electron number of C atom in CO32-is 4+22=3, that is, three hybrid orbitals are formed, and the hybrid type is sp2;; CO32- has an atomic number of 4 and a valence electron number of 24, so NO3- and SiO 2- are isoelectrons.
So the answer is: sp2;; NO3-、SiO 32-;
(4)Ba is located in the center of the body, the number is 1, Ti is located at the vertex, the number is 8× 18= 1, O is located at the edge center, and the chemical formula is BaTiO3, so the answer is: Batio3;
(5) 1molTi, 1molCl and 5molH2O form 6molσ bond, 5molH2O contains 5x2 = 10mol σ bond, while external 1molH2O contains 2molσ bond, and * * contains 6+10+2 =.