MP3: Three weeks test AP chemistry

Front

What is a resonance structure?

Back

A resonance structure is one of two or more valid Lewis structures for a molecule that cannot be represented accurately by a single Lewis structure. Resonance structures differ only in the placement of electrons.

Front

What is the bond order of a molecule?

Back

Bond order is the number of chemical bonds between a pair of atoms. It can be calculated as the number of bonding pairs of electrons minus the number of antibonding pairs, divided by two.

Front

How many resonance structures can the nitrate ion (NO3-) have?

Back

The nitrate ion (NO3-) has three resonance structures.

Front

What is the bond angle in a trigonal planar molecule?

Back

The bond angle in a trigonal planar molecule is approximately 120 degrees.

Front

What is the significance of bond length in resonance structures?

Back

In resonance structures, bond lengths can vary. A bond that is shorter indicates a stronger bond, while a longer bond suggests a weaker bond. In resonance, bonds may have characteristics of both.

Front

What is the molecular geometry of CCl4?

Back

The molecular geometry of CCl4 (carbon tetrachloride) is tetrahedral.

Front

How many lone pairs are present in HCl?

Back

HCl has 3 lone pairs on the chlorine atom.

Front

What is a Lewis structure?

Back

A Lewis structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Front

What is the difference between polar and nonpolar molecules?

Back

Polar molecules have a net dipole moment due to the presence of polar bonds, while nonpolar molecules do not have a net dipole moment and have an even distribution of charge.

Front

What is the hybridization of the central atom in CH3Cl?

Back

The hybridization of the central atom (carbon) in CH3Cl is sp3.