Question

dr. harden says the o - o bond is polar and the c - c bond is non - polar. a good student would say:
wrong again, hap. both bonds are nonpolar.
yes. o attracts electrons more strongly than c.
no, both bonds are highly polar.
no way. c is more electronegative than o.
right! o is electronegative, so o₂ is polar.

part d
use your knowledge of electronegativity to pick out the most polar bond in the list below.
c - h
n - h
o - h
o - n
o - c

Explanation:

1. For the first - part: A polar bond occurs when there is a significant difference in electronegativity between the two atoms in the bond. In an O - O bond and a C - C bond, the two atoms are identical. Since identical atoms have the same electronegativity, there is no uneven sharing of electrons, and both bonds are non - polar.
2. For the second - part: The polarity of a bond is determined by the electronegativity difference between the two atoms. The electronegativity values of C = 2.5, N = 3.0, O = 3.5, H = 2.1. Calculate the electronegativity differences:

• For C - H: $\Delta\chi=|2.5 - 2.1|=0.4$.
• For N - H: $\Delta\chi=|3.0 - 2.1| = 0.9$.
• For O - H: $\Delta\chi=|3.5 - 2.1|=1.4$.
• For O - F: Fluorine has an electronegativity of 4.0, so $\Delta\chi=|4.0 - 3.5| = 0.5$.
• For O - C: $\Delta\chi=|3.5 - 2.5|=1.0$. The O - H bond has the largest electronegativity difference among them, so it is the most polar.

Answer:

First - part: Wrong again, Hugh. Both bonds are nonpolar.
Second - part: OH