Midterm Exam 2 Practice

Front

What is the bond angle in a molecule with two lone pairs on the central atom?

Back

around 109.5 degrees

Front

What electronic geometries can lead to an angular (bent) molecular geometry?

Back

trigonal planar and tetrahedral

Front

What is Hund's rule?

Back

Hund's rule states that electrons will occupy degenerate orbitals singly before pairing up.

Front

What is the formal charge on an atom?

Back

The formal charge is the charge an atom would have if all bonding electrons were shared equally.

Front

What is the formal charge on the Xe atom in XeF₄?

Back

0

Front

How many lone pairs of electrons are around the central atom in xenon difluoride (XeF₂)?

Back

6

Front

What is the molecular geometry of a molecule with two lone pairs and two bonded atoms?

Back

Bent or angular.

Front

What is the significance of lone pairs in determining molecular geometry?

Back

Lone pairs repel more strongly than bonding pairs, affecting the shape of the molecule.

Front

What is the electron configuration for an atom that violates Hund's rule?

Back

An example would be having two electrons in the same orbital of a subshell before all orbitals are singly occupied.

Front

What is the shape of a molecule with a tetrahedral electronic geometry and two lone pairs?

Back

Bent.