CHM 261, QUIZ 12 PDF

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Fall'18 quiz 12 questions and answers...

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Name: __________________________ Date: _____________ 1. According to VSEPR theory, a molecule with the general formula AX2 will have a ___ molecular shape. A) linear B) bent C) trigonal planar D) tetrahedral E) triangular 2. What is the molecular shape of ClCN as predicted by the VSEPR theory? (Carbon is the central atom.) A) linear B) bent C) angular D) trigonal E) none of the above 3. What is the molecular shape of SiF62– as predicted by the VSEPR theory?

2-

F F

F Si

F

F F

A) B) C) D) E)

trigonal bipyramidal hexagonal tetrahedral see-saw octahedral

4. Predict the ideal bond angles in GeCl4 using the molecular shape given by the VSEPR theory. A) 90° B) 109° C) 120° D) 180° E) < 90°

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5. Predict the ideal bond angles around carbon in C2I2 using the molecular shape given by the VSEPR theory. A) 90° B) 109° C) 120° D) 180° E) none of the above 6. Which one of the following molecules has a zero dipole moment? A) SO2 B) HCl C) CS2 D) CO E) Cl2O 7. A molecule with the formula AX4 uses _________ to form its bonds. A) sp hybrid orbitals B) sp2 hybrid orbitals C) sp3 hybrid orbitals D) sp3d hybrid orbitals E) sp3d2 hybrid orbitals 8. Valence bond theory predicts that sulfur will use _____ hybrid orbitals in sulfur dioxide, SO2. A) sp B) sp2 C) sp3 D) sp3d E) sp3d2 9. Determine the shape (geometry) of PCl3 and then decide on the appropriate hybridization of phosphorus in this molecule. (Phosphorus is the central atom.) A) sp3 B) sp2 C) sp D) sp3d E) sp3d 2

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10. Use VSEPR theory to predict the electron pair geometry around iodine, the central atom in the ion IF2–. A) octahedral B) trigonal bipyramidal C) tetrahedral D) trigonal planar E) bent

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Answer Key 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

A A E B D C C B A B

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