AP Chem Ch9 Practice Answers

AP Chem Ch9 Practice Answers - AP Chemistry Kotz - Chapter...

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AP Chemistry Kotz - Chapter 9 Practice Problem Answers 1. a. [Ar]3d 3 The first two electrons come out of the 4s sublevel then one out of the 3d b. [Ne]3s 2 3p 6 noble gas configuration c. [Ar]3d 10 The two electrons come out of the 4s sublevel (highest energy level first) d. [Kr]4d 10 5s 2 5p 6 noble gas configuration e. [Ar]3d 10 4s 2 4p 6 noble gas configuration f. [Ar]3d 10 Remember the normal configuration for Cu is [Ar]4s 1 3d 10 , it's one of the ones that migrate an electron from the 4s sublevel to complete the higher energy 3d sublevel. The first electron out for a cation is the lone electron in the 4s. 2. a. KI potassium iodide b. barium fluoride BaF 2 K + + [ I ] - Ba 2+ + 2[ F ] - c. Rb 2 S rubidium sulfide d. aluminum oxide, Al 2 O 3 2Rb + + [ S ] 2- 2Al 3+ + 3[ O ] 2- These are all examples of ionic compounds (metal/nonmetal), so the electronegativity difference is large enough that the electrons are completely transferred from the metal to the nonmetal. The metal loses electrons exposing the filled lower energy s and p sublevels, and the nonmetal completes the octet of its current s and p sublevel. Note that even though no dots are shown around the cation, it is considered to have a full octet of electrons (from the next lower energy level as stated above). 3. Lattice energy for sodium fluoride is -914kJ/mol. Determine the enthalpy of formation for NaF (s) Endothermic steps: a. Enthalpy of sublimation for Na = +107kJ/mol b. Dissociation of ½ mole of F 2 to produce one mole of F atoms = ½ the bond dissociation energy = ½ (+159kJ/mol) =
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AP Chem Ch9 Practice Answers - AP Chemistry Kotz - Chapter...

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