Multiple Choice
Which term describes a covalent bond in which electrons are shared unequally, resulting in a dipole moment?
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11. Bonding & Molecular Structure
Dipole Moment
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Which pair of atoms forms the most polar bond?
A
H and F
B
C and H
C
N and O
D
S and O
Verified step by step guidance1
Understand that bond polarity depends on the difference in electronegativity between the two atoms forming the bond. The greater the difference, the more polar the bond.
Recall the approximate electronegativity values for the atoms involved: H (2.1), F (4.0), C (2.5), N (3.0), O (3.5), and S (2.5).
Calculate the electronegativity difference for each pair: For H-F, \( |2.1 - 4.0| = 1.9 \); for C-H, \( |2.5 - 2.1| = 0.4 \); for N-O, \( |3.0 - 3.5| = 0.5 \); for S-O, \( |2.5 - 3.5| = 1.0 \).
Compare these differences to determine which pair has the largest electronegativity difference, indicating the most polar bond.
Conclude that the pair with the highest electronegativity difference forms the most polar bond.
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