Lewis Dot Structures & VSEPR

Front

What is a Lewis Dot Structure?

Back

A Lewis Dot Structure is a diagram that represents the valence electrons of atoms within a molecule, showing how they are arranged among the atoms.

Front

How many valence electrons does nitrogen have?

Back

Nitrogen has 5 valence electrons.

Front

What is the Lewis Dot Structure for ammonia (NH3)?

Back

The Lewis Dot Structure for ammonia shows nitrogen in the center with three hydrogen atoms bonded to it and a lone pair of electrons on nitrogen.

Front

What is the significance of the VSEPR theory?

Back

The VSEPR (Valence Shell Electron Pair Repulsion) theory is used to predict the 3D shape of molecules based on the repulsion between electron pairs.

Front

What is the molecular shape of methane (CH4) according to VSEPR theory?

Back

The molecular shape of methane (CH4) is tetrahedral.

Front

Describe the polarity of the carbon dioxide (CO2) molecule.

Back

The C-O bonds are polar, but the molecule is non-polar due to its linear shape, which causes the dipoles to cancel.

Front

What does each line in a Lewis Structure represent?

Back

Each line in a Lewis Structure represents 2 electrons.

Front

What is the correct Lewis structure for phosphorus tribromide (PBr3)?

Back

The correct Lewis structure for PBr3 has phosphorus in the center with three bromine atoms bonded to it and a lone pair of electrons on phosphorus.

Front

How do you determine the number of lone pairs in a Lewis structure?

Back

Lone pairs are determined by subtracting the number of bonding electrons from the total valence electrons of the atom.

Front

What is the bond angle in a tetrahedral molecular geometry?

Back

The bond angle in a tetrahedral molecular geometry is approximately 109.5 degrees.