Question

which is classified as nonpolar covalent?
chapter 4 compounds and their bonds - ppt video online download
a the n-h bond in nh3
b the h-s bond in h2s
c the n-cl bond in ncl3
d the h-i bond in hi
e the p-cl bond in pcl3

Explanation:

To determine if a bond is nonpolar covalent, we look at the electronegativity difference ($\Delta EN$) between the two atoms. If $\Delta EN = 0$, the bond is nonpolar covalent.

• For the N - H bond in $NH_3$: The electronegativity of N is 3.04 and of H is 2.20. $\Delta EN=3.04 - 2.20=0.84$.
• For the H - S bond in $H_2S$: The electronegativity of S is 2.58 and of H is 2.20. $\Delta EN = 2.58-2.20 = 0.38$.
• For the N - Cl bond in $NCl_3$: The electronegativity of N is 3.04 and of Cl is 3.16. $\Delta EN=3.16 - 3.04=0.12$.
• For the H - I bond in $HI$: The electronegativity of I is 2.66 and of H is 2.20. $\Delta EN=2.66 - 2.20 = 0.46$.
• For the P - Cl bond in $PCl_3$: The electronegativity of P is 2.19 and of Cl is 3.16. $\Delta EN=3.16 - 2.19=0.97$.

Since the $\Delta EN$ for the N - Cl bond in $NCl_3$ is closest to 0 among the given options, it is the nonpolar covalent bond.

Answer:

C. the N - Cl bond in $NCl_3$