All are the properties of non-polar covalent bond except:
Correct answer: D. Water and ammonia are non polar covalent compounds.
- A. The difference in electronegativity between the two atoms is less than 0.4.
- B. The electrons are shared equally between the two atoms.
- C. They have lower melting and boiling points than polar covalent bonds.
- D. Water and ammonia are non polar covalent compounds.
Explanation
Water (H2O) and ammonia (NH3) are both polar covalent compounds. This is because the electronegativity of oxygen (3.44) and hydrogen (2.2) is different enough to create a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. The electronegativity of nitrogen is 3.04, while the electronegativity of hydrogen is 2.20. This means that there is a difference in electronegativity of 0.84 between the nitrogen atom and each of the hydrogen atoms, which creates a polar covalent bond.
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Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
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