7AW11Quiz4BSolutions

# 7AW11Quiz4BSolutions - Quiz 4B DL SEC Grade Last name first...

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Quiz 4B DL SEC _ _ Grade: 02/14/11 Last 6 digits of student ID _ _ _ _ _ _ Last name, first name: ________________ ________________ First three letters of your last name _ _ _ Useful formulae: Δ E th =mc p Δ T; Δ E bond =±| Δ m Δ H|; N A = 6x10 23 ; E bond = Σ all pairs (PE pair-wise ) ; E total = sum of all relevant energies; Δ E open = Σ Δ E i = Q+W; Δ E closed = Σ Δ E i = 0 This Quiz Has Two Sides! Problem 1. The picture to the right shows a very small piece of a large two-dimensional solid. The entire solid has N atoms. (Assume N is large enough so that the number of atoms on the edge is not a large fraction of N, so you can treat all atoms as if they are on the interior of the substance.) Each pair of atoms has the potential energy shown in the adjacent figure. [Recall 1 Å(Angstrom) = 10 -10 m.] a) What is the number of nearest neighbors for each atom in the interior of this solid? 4

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7AW11Quiz4BSolutions - Quiz 4B DL SEC Grade Last name first...

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