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Which of the following covalent bonds is the most polar?

A. H-O
B. H-C
C. H-H
D. H-S

Sagot :

GinnyAnsweridn
To determine which covalent bond is the most polar, we need to compare the differences in electronegativity between the atoms in each bond. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The greater the difference in electronegativity between two atoms, the more polar the bond.

Here are the electronegativity values for the atoms involved:
- Oxygen (O): 3.44
- Carbon (C): 2.55
- Hydrogen (H): 2.20
- Sulfur (S): 2.58

Next, we calculate the absolute differences in electronegativity for each bond:

1. AH-O (Hydrogen - Oxygen)
[tex]\[ \text{Difference} = |3.44 - 2.20| = 1.24 \][/tex]

2. BH-C (Hydrogen - Carbon)
[tex]\[ \text{Difference} = |2.55 - 2.20| = 0.35 \][/tex]

3. CH-H (Hydrogen - Hydrogen)
[tex]\[ \text{Difference} = |2.20 - 2.20| = 0.00 \][/tex]

4. DH-S (Hydrogen - Sulfur)
[tex]\[ \text{Difference} = |2.58 - 2.20| = 0.38 \][/tex]

Now we compare these differences:
- AH-O: 1.24
- BH-C: 0.35
- CH-H: 0.00
- DH-S: 0.38

The bond with the largest electronegativity difference is AH-O with a difference of 1.24.

Therefore, the most polar bond is:

AH-O
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