Chemistry Chapter 10 Flashcards

Questions and Answers

What is the difference between electron geometry and molecular geometry?

The electron geometry only considers lone pairs of electrons and the molecular geometry only considers the atoms.

There is no difference between electron and molecular geometries; they are simply different names for the same thing.

Electron geometry describes the arrangement of the electron groups in a molecule, whereas the molecular geometry describes the arrangement of the atoms. (correct)

Lone pairs are included in the electron geometry but play no role in the molecular geometry.

In which cases do you expect deviations from the idealized bond angle? (Check all that apply)

CH3Br (correct)

SBr2 (correct)

PF3 (correct)

BCl3

What are the 4 types of electron geometry for 2, 3, 4, 5, and 6 bonds?

Linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral

What are the hybridizations for linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral geometries?

sp, sp2, sp3, sp3d, sp3d2 Signup and view all the answers

For 2 bonds and 0 lone pairs: e- geometry=, molecular geometry=, hybridization=, bond angle=, polar or nonpolar?

e- geometry=linear, molecular geometry=linear, hybridization=sp, bond angle=180, polar or nonpolar=nonpolar Signup and view all the answers

For 2 bonds and 1 lone pair: e- geometry=, molecular geometry=, hybridization=, bond angle=, polar or nonpolar?

e- geometry=linear, molecular geometry=linear, hybridization=sp, bond angle=none, polar or nonpolar=depends Signup and view all the answers

For 3 bonds and 0 lone pairs: e- geometry=, molecular geometry=, hybridization=, bond angle=, polar or nonpolar?

e- geometry=trigonal planar, molecular geometry=trigonal planar, hybridization=sp2, bond angle=120, polar or nonpolar=nonpolar Signup and view all the answers

What is the molecular geometry and hybridization for 3 bonds and 1 lone pair?

e- geometry=trigonal planar, molecular geometry=bent, hybridization=sp2 Signup and view all the answers

Study Notes

VSEPR Theory and Geometries

VSEPR theory distinguishes between electron geometry and molecular geometry.
Electron geometry accounts for lone pairs and bonding pairs, while molecular geometry focuses solely on atomic arrangement.
Lone pairs increase repulsion, affecting bond angles.

Deviations from Ideal Bond Angles

PF3 and SBr2 have lone pairs on the central atom, leading to bond angle deviations.
CH3Br may deviate due to larger atoms (Cl or Br) and the presence of multiple bonds.
BCl3 has no lone pairs and symmetrical identical atoms, maintaining ideal bond angles.

Types of Electron Geometry

Two bonds: linear
Three bonds: trigonal planar
Four bonds: tetrahedral
Five bonds: trigonal bipyramidal
Six bonds: octahedral

Hybridization Types

Linear geometry corresponds to sp hybridization.
Trigonal planar geometry corresponds to sp2 hybridization.
Tetrahedral geometry corresponds to sp3 hybridization.
Trigonal bipyramidal geometry corresponds to sp3d hybridization.
Octahedral geometry corresponds to sp3d2 hybridization.

Molecular Geometry for Various Structures

For 2 bonds and 0 lone pairs:
- Electron geometry: linear
- Molecular geometry: linear
- Hybridization: sp
- Bond angle: 180°
- Nonpolar
For 2 bonds and 1 lone pair:
- Electron geometry: linear
- Molecular geometry: linear
- Hybridization: sp
- Bond angle: none (depends on other factors)

Geometry with Three Bonds

For 3 bonds and 0 lone pairs:
- Electron geometry: trigonal planar
- Molecular geometry: trigonal planar
- Hybridization: sp2
- Bond angle: 120°
- Nonpolar
For 3 bonds and 1 lone pair:
- Electron geometry: trigonal planar
- Molecular geometry: bent
- Hybridization: sp2

Description

Test your understanding of VSEPR theory with our Chapter 10 flashcards. Discover the differences between electron geometry and molecular geometry. Perfect for quick revision or deepening your grasp of molecular structures.