Question

select the molecule that contains the most polar bond. note that you should identify the most polar bond, not the most polar molecule.
○ h₂s
○ ch₄
○ f₂
○ h₂o

Explanation:

The polarity of a bond depends on the electronegativity difference between the atoms forming the bond.

• For \(H_2S\), the electronegativity of \(H = 2.1\) and \(S=2.5\). The electronegativity difference \(\Delta \chi=2.5 - 2.1=0.4\).
• For \(CH_4\), the electronegativity of \(H = 2.1\) and \(C = 2.5\). The electronegativity difference \(\Delta \chi=2.5 - 2.1 = 0.4\).
• For \(F_2\), since the two atoms are the same (\(F = 4.0\)), the electronegativity difference \(\Delta \chi=4.0-4.0 = 0\). This is a non - polar covalent bond.
• For \(H_2O\), the electronegativity of \(H=2.1\) and \(O = 3.5\). The electronegativity difference \(\Delta \chi=3.5 - 2.1=1.4\).

Since \(H_2O\) has the highest electronegativity difference among the given molecules for its bonds (\(O - H\) bonds), its bonds are the most polar.

Answer:

\(H_2O\)