Quiz 2 - Molecular Geometry | Molecular Geometry
General Chemistry 1 - Quiz 2 - Molecular Geometry
Which of the following molecular shapes is correctly predicted by VSEPR theory for SF4?
According to VSEPR theory, SF4 has five electron domains (four bonding pairs and one lone pair) around the central sulfur atom. The lone pair occupies an equatorial position in a trigonal bipyramidal electron-domain geometry, resulting in a seesaw molecular shape.
What is the molecular geometry of BrF5?
BrF5 has six electron domains (five bonding pairs and one lone pair) around the central bromine atom. The electron-domain geometry is octahedral, but with one lone pair, the molecular geometry is square pyramidal.
Which molecule has the largest deviation from ideal bond angles due to lone pair repulsion?
H2O has two lone pairs on the oxygen atom, which exert strong repulsive forces, reducing the H-O-H bond angle to about 104.5°, compared to the ideal tetrahedral angle of 109.5°.
Which of the following molecules has bond angles closest to the ideal tetrahedral angle?
In CH4 (methane), all four bonding pairs around the carbon atom are equivalent, resulting in bond angles of 109.5°, which is the ideal tetrahedral angle.
Which of the following molecules is nonpolar despite having polar bonds?
CO2 has polar bonds, but it is a linear molecule. The bond dipoles cancel each other out, resulting in a nonpolar molecule.
Which of the following best describes the molecular shape of XeF2?
XeF2 has five electron domains (two bonding pairs and three lone pairs) around the central xenon atom. The lone pairs occupy equatorial positions in a trigonal bipyramidal arrangement, resulting in a linear molecular shape.
What is the correct VSEPR notation for NH4+?
NH4+ (ammonium ion) has four bonding pairs around the central nitrogen atom and no lone pairs, giving it the VSEPR notation AX4 and a tetrahedral shape.
What is the electron-domain geometry and molecular geometry of SF6?
SF6 has six bonding pairs and no lone pairs around the central sulfur atom, resulting in both an octahedral electron-domain geometry and an octahedral molecular geometry.
Which molecule has bond angles closest to 120°?
BF3 has a trigonal planar geometry with bond angles of 120° due to its three bonding pairs and no lone pairs on the boron atom.
Which of the following molecules is nonpolar despite having polar bonds?
CCl4 has polar bonds, but it is a tetrahedral molecule with symmetrical charge distribution, resulting in a nonpolar molecule.