Question

understanding main ideas

1. explain why water is a polar molecule.
2. how does a hydrogen bond compare to a covalent bond?

Explanation:

Question 1:

Water is a polar molecule because of its bent molecular shape. Oxygen is more electronegative than hydrogen. In the \(H - O\) bonds, the electrons are pulled closer to the oxygen atom. This creates a partial negative charge (\(\delta-\)) on the oxygen and partial positive charges (\(\delta+\)) on the hydrogen atoms. The separation of these charges (dipole) makes the water molecule polar.

Question 2:

A covalent bond is a strong chemical bond where atoms share electrons. For example, in \(H - O\) bonds in water, electrons are shared between \(H\) and \(O\). A hydrogen bond is a much weaker intermolecular force. It is an attraction between a partially positive hydrogen atom (from a polar molecule like water) and a partially negative atom (usually \(O\), \(N\), or \(F\) in another polar molecule). Hydrogen bonds are about \(1/20\) the strength of a typical covalent bond.

Answer:

1. Water is polar due to bent shape and electronegativity difference (\(O\) pulls electrons, creating \(\delta-\) on \(O\) and \(\delta+\) on \(H\)).
2. Covalent bond (strong, electron - sharing) vs hydrogen bond (weak, intermolecular, dipole - dipole attraction, ~1/20 covalent bond strength).