2122 Adv Polarity

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 out.

Front

What determines if a molecule is polar or nonpolar?

Back

A molecule is polar if it has a net dipole moment, which occurs when there is an unequal sharing of electrons due to differences in electronegativity between atoms.

Front

Define electronegativity.

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Front

What is a polar covalent bond?

Back

A polar covalent bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms.

Front

Which type of bond is formed between two nonmetals with similar electronegativities?

Back

A nonpolar covalent bond.

Front

What is the significance of the shape of a molecule in determining its polarity?

Back

The shape of a molecule affects the distribution of charge; even if a molecule has polar bonds, its overall polarity depends on its geometry.

Front

Give an example of a nonpolar molecule.

Back

Examples include H2, O2, and CO2.

Front

What is the difference between polar and nonpolar molecules?

Back

Polar molecules have a partial positive charge on one end and a partial negative charge on the other, while nonpolar molecules have an even distribution of charge.

Front

How does the presence of lone pairs affect molecular polarity?

Back

Lone pairs can create an uneven distribution of charge, contributing to the overall polarity of the molecule.

Front

What is the molecular geometry of PH3?

Back

PH3 has a trigonal pyramidal geometry, which contributes to its polarity.