AP Chemistry Semester 1 Final

Front

What is a dipole in a molecule?

Back

A dipole is a separation of positive and negative charges in a molecule, resulting from differences in electronegativity between atoms.

Front

Which atom typically has a positive dipole in a polar covalent bond?

Back

The atom with the lower electronegativity, which is less able to attract electrons, typically has a positive dipole.

Front

What is hybridization in chemistry?

Back

Hybridization is the concept of mixing atomic orbitals to form new hybrid orbitals that can form covalent bonds.

Front

What is the hybridization of a carbon atom in a tetrahedral molecule?

Back

The hybridization is sp^3.

Front

What is the average atomic mass of an element?

Back

The average atomic mass is the weighted average of the masses of an element's isotopes, measured in atomic mass units (amu).

Front

What is surface tension?

Back

Surface tension is the property of a liquid that causes its surface to behave like a stretched elastic membrane, due to cohesive forces between molecules.

Front

What type of bonding causes surface tension in water?

Back

Hydrogen bonding between water molecules causes surface tension.

Front

What is the bond angle in a water molecule (H2O)?

Back

The bond angle in H2O is approximately 104.5 degrees.

Front

What is the significance of bond angles in molecular geometry?

Back

Bond angles determine the shape of a molecule, which affects its reactivity and interactions with other molecules.

Front

What is the difference between covalent bonds and ionic bonds?

Back

Covalent bonds involve the sharing of electron pairs between atoms, while ionic bonds involve the transfer of electrons from one atom to another, resulting in charged ions.