2. Which of the following elements is most likely to be a good conductor of electricity? (A) N (B) S (C) He (D) Fe

9. Based on the solubility rules, which of the following will occur if solutions of CuSO4(aq) and BaCl2(aq) are mixed? (A) CuCl2 will precipitate; Ba2+ and SO42 – are spectator ions (B) CuSO4 will precipitate; Ba2+ and Cl – are spectator ions (C) BaSO4 will precipitate; Cu2+ and Cl– are spectator ions (D) BaCl2 will precipitate; Cu2+ and SO42 – are spectator ions