Which bond in urea is most polar?
(P.S. I tried C-O and N-C-O, but it's incorrect)
I would have guessed C=O also. Try them but look up the electronegativity of each; I don't remember them that well.
O is about 3.5
N about 3
C about 2.5
H about 2.1
difference is about 1 for C=O
about 0.9 for NH
about 0.5 for N-C
I have a copy of a periodic table that touts better numbers. If I use them it has
N = 3.04
H = 2.20 for a difference of 0.84
C = 2.55
O = 3.44 for a difference of 0.89
but that says go with C=O also.
Look in your text/notes and go with those numbers.
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The most polar bond in urea is the N-H bond.
To determine which bond in urea is the most polar, we need to consider the electronegativity values of the atoms involved. Electronegativity is a measure of an atom's ability to attract electrons towards itself in a covalent bond.
In urea (CO(NH2)2), we have three different types of bonds: C-N, C=O, and N-H.
Let's compare the electronegativities of the atoms involved:
- Carbon (C) has an electronegativity of approximately 2.5.
- Nitrogen (N) has an electronegativity of approximately 3.0.
- Oxygen (O) has an electronegativity of approximately 3.5.
- Hydrogen (H) has an electronegativity of approximately 2.1.
Now, let's analyze the different bonds:
1. C-N bond: The electronegativity difference is 0.5 (3.0 - 2.5). This bond is somewhat polar but not as polar as others.
2. C=O bond (carbonyl group): The electronegativity difference is 1.0 (3.5 - 2.5). This bond is more polar than the C-N bond.
3. N-H bond: The electronegativity difference is 0.9 (3.0 - 2.1). This bond is also more polar than the C-N bond but less polar than the C=O bond.
Based on the electronegativity differences, the C=O bond (carbonyl group) in urea is the most polar bond.