1. (5 pts) Which of the following is true about Laporte allowed/forbidden transitions? (Select only one answer. There is only one correct answer) a) d-d transitions in [CoCl4]2- are allowed because the e orbitals are lower than the t2 orbitals b) d-d transitions in [Cu(NH3)6]2+ are allowed because Jahn-Teller distortion lowers symmetry c) Charge transfer transitions in [MnO4]2- are forbidden because an electron moves from O to Mn d) The rule is relaxed in octahedral complexes by vibrations that remove the center of symmetry e) The Laporte selection rule only applies to organic molecules

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Calculate the number of molecules present in 0.750 mol of mgo.