Chem 112 Exam AID Course Pack

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Unformatted text preview: is obeyed A positive deviation from Raoult’s Law is observed. A negative deviation from Raoult’s Law is observed. 15. In which of the following substances should hydrogen bonding contribute significantly to the attractive interactions among the molecules? a) b) c) d) e) H2O (l) HF (l) NH3 (l) All of these None of these 16. In a given atom, the maximum number of electrons which can have the quantum numbers n=4, l=2, ml=0 is: a) b) c) d) e) 0 2 6 10 32 17. The molecular shape (arrangement of the atoms) for the molecule PF3 can best be described as: a) b) c) d) e) trigonal pyramidal trigonal planar trigonal bipyramidal tetrahedral T- shaped 18. A possible Lewis structure for hydrogen cyanide is [H:C:::N:] where (::: represents a triple bond). The formal charges on the H, C and N atoms respectively are: a) - 1, 0, 0 b) c) 0, 0, - 1 d) e)- 1, +1, - 1 0, - 1, 0 0, 0, 0 Ethan Newton & Barry Zhang for SOS Winter 2012 37 19. Which set of quantum numbers could describe an electron in a 3d orbital? a) b) c) d) e) n=3, l=0, ml=0, ms=1/2 n=2, l=2, ml=1, ms=1/2 n=3, l=2, ml=- 1, ms=1/2 n=3, l=1, ml=0, ms=1/2 n=3, l=2, ml=3, ms=1/2 20. Which of the following is a possible set of n, l, ml, and ms quantum numbers for the last electron added to form an As3- ion? a) b) c) d) e) n=3, l=1, ml=- 1, ms=1/2 n=2, l=0, ml=0, ms=- 1/2 n=4, l=2, ml=0, ms=- 1/2 n=4, l=1, ml=- 1, ms=1/2 n=5, l=0, ml=0, ms=1/2 21. The bond between the carbon atoms in ethyne, HCCH, consists of: a) b) c) d) e) a sigma (σ) bond only three pi (π) bonds two sigma (σ) bonds and one pi(π) bond one sigma (σ) bond and two pi (π) bonds one sigma (σ) and one pi (π) bond 22. The unit cell indicated below a) b) c) d) e) represents a simple cubic structure contains 4 octahedral holes and 4 tetrahedral holes represents a body centre cubic structure contains 2 atoms per unit cell contains 8 tetrahedral and 4 octahedral holes 23. Atom A has 3 electrons in its valence shell and atom B has 6 electrons in its valence shell. The formula expected for a compound of A and B is: a) b) c) d) e) A3B2 A3B6 B2A A2B A2B3 Ethan Newton & Barry Zhang for SOS Winter 2012 38 . Photons of minimum energy 486 kJ/mol are needed to ionize sodium atoms. If light of 600 kJ/mol is used, what is the...
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