Pre-AP CHEM Unit 6 Day 5 Review

Front

What is polarity in molecules?

Back

Polarity refers to the distribution of electrical charge over the atoms joined by the bond. A polar molecule has a net dipole moment due to the presence of polar bonds that do not cancel each other out.

Front

Which molecule is the most polar?

Back

H₂O (water) is the most polar molecule among CH₄, CF₄, H₂O, and CO₂ due to its bent shape and the high electronegativity difference between oxygen and hydrogen.

Front

What determines the polarity of a molecule?

Back

The polarity of a molecule is determined by the shape of the molecule and the difference in electronegativity between the atoms involved in the bonds.

Front

What is a dipole moment?

Back

A dipole moment is a measure of the separation of positive and negative charges in a molecule, indicating the polarity of the molecule.

Front

What are dispersion forces?

Back

Dispersion forces, also known as London dispersion forces, are weak intermolecular forces that arise from temporary dipoles in molecules.

Front

Which molecule has only dispersion forces?

Back

CCl₄ (carbon tetrachloride) has only dispersion forces because it is nonpolar.

Front

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

Back

Lone pairs can affect the shape of a molecule and contribute to its overall dipole moment, influencing whether the molecule is polar or nonpolar.

Front

How do C-F and C-Br bonds compare in terms of polarity?

Back

C-F bonds are more polar than C-Br bonds due to the greater electronegativity difference between carbon and fluorine compared to carbon and bromine.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to form bonds in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration.

Front

What is a polar molecule?

Back

A polar molecule is one that has a net dipole moment due to an uneven distribution of electrons, resulting in partial positive and negative charges.