AP Chem 2012 questions and answers (1-6)

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(A) BeCl2

(B) SO2

(C) N2

(D) O2

(E) F2

  1. Is a polar molecule. The easiest way to figure out whether a molecule is polar or non polar is to use these two principles: for a molecule to be nonpolar the central atom is surrounded by the sea atoms and has no lone pairs. Therefore, F2, O2, N2 are nonpolar (since its the same atoms connected to each other). BeCl2 is also nonpolar since beryllium is connected to two chlorines and has no lone pairs. Therefore, SO2 is polar, because sulfur has lone pairs on it. Choice B

  2. Is best represented by two or more resonance forms. Resonance forms are forms of the same molecule where electrons are moved and have a different location. Resonance forms can occur for SO2, since either oxygen could have a double bond. Choice B