What does VSEPR model mean? A) Very Specific Electron and Proton Repair model B)

Question

What does VSEPR model mean? A) Very Specific Electron and Proton Repair model B) Variable Selective of Electron and PRotons C) Valence Shell for Every Proton D) Very Selective Electron PaiR theory E) Valence Shell Electron-Pair Repulsion According to the VSEPR theory, which one of the following species should be linear? A) H_2S B) HCN C) BF_3 D) H_2CO E) SO_3 What is the approximate bond angle for CCl_4? A) 90 degree B) 109.5 degree C) 120 degree D) 145 degree E) 180 degree Which one of the following molecules is nonpolar? A) CO_2 B) BF_3 C) KCl D) IBr_2 E) CHCl_3 Valence bond theory predicts that carbon will use _____ hybrid orbitals in the carbonate anion. CO^2-_3. A) sp B) sp^2 C) sp^3 D) sp^3d E) sp^3d^2 According to valence bond theory, the triple bond in acetylene consists of A) three s bonds and no p bonds. B) two s bonds and one p bond. C) one s bond and two p bonds. D) no s bonds and three p bonds. E) None of these choices is correct. Draw a Lewis structure for PFs that shows the correct atom arrangement predicted by the VSEPR theory. Which is not a property of a gas? A) Density varies with temperature B) Assumes the shape and volume of its container C) Are compressible D) Density is larger than that of a liquid E) Form homogeneous mixtures with one another Which of the following is the definition of pressure? A) area/force B) force x area C) force/area D) height x volume E) gravity x density x temperature If 25.5 L of oxygen are cooled from 150 degree C to 50 degree C at constant pressure, what is the new volume of oxygen? A) 0.0514 L B) 19.5 L C) 33.4 L D) 0.03 L E) 3.5 L If a constant number of moles of a gas is at a pressure of 1.35 atm and has a volume of 23.8 L at a temperature of 205.1 K, what is the final volume of the gas if the pressure changes to 2.84 atm and the temperature rises to 233.4 K? A) 9.9 L B) 44.0 L C) 12.9 L D) 57.0 L E) 0.18 L

Explanation / Answer

1. The right answer is option E. Valence shell electron pair repulsion.

Valence shell electron pair repulsion (VSEPR) theory was developed by Gillespie and Nyholm. It is a model used to a determine the molecular geometry. The model is based on the theory that repulsion between electrons in the orbitals give rise to specific arrangement of electron pair around the central atom.

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