The answer is b) N – H. The quick answer – right from the get-go, since nitrogen is one of the most electronegative elements in the periodic table, the bond it forms with hydrogen will be the most polar out of all those listed.
Do covalent bonds have low polarity?
When the difference is very small or zero, the bond is covalent and nonpolar. When it is large, the bond is polar covalent or ionic….Electronegativity and Bond Type.
| Bond | Electronegativity Difference | Polarity |
|---|---|---|
| C–C | 0.0 | nonpolar |
| C–H | 0.4 | δ−C−δ+H |
| Si–C | 0.7 | δ+Si−δ−C |
| Si–O | 1.7 | δ+Si−δ−O |
Why do polar covalent bonds have low melting points?
Melting and Boiling Points increase as the molecules get bigger. Polar Covalent Molecules have slight positive charges and slight negative charges at opposite ends of the molecule. Polar Covalent Molecules have extra attractions betwen molecules. Polar Covalent Molecules have slightly higher Melting and Boiling Points.
What bonds have low melting points?
Covalent compounds generally have low boiling and melting points, and are found in all three physical states at room temperature. Covalent compounds do not conduct electricity; this is because covalent compounds do not have charged particles capable of transporting electrons.
Why do polar bonds have higher boiling points?
Polar molecules have strong intermolecular forces of attraction. It takes more energy to separate the molecules from each other, so polar substances have relatively high melting points and boiling points.
Do polar bonds have higher boiling points?
The polar substance always has the higher boiling point, indicating greater attractive forces between separate molecules, that is, larger intermolecular forces.
Does boiling break bonds?
When a liquid boils, the intermolecular bonds are broken, and the molecules are dispersed in the gas phase. Breaking these bonds requires energy, provided by heat. A stronger intermolecular bond requires more energy to break, and a higher temperature is required to provide this energy.
Why are hydrogen bonds stronger than dipole-dipole?
However, a hydrogen bond is specifically between a partially positive hydrogen atom and a partially negative atom (N, O, or F). Since N, O, and F, are much more electronegative than hydrogen, the dipole is stronger, therefore the polarity is stronger.