Adapted by Nelson Nuñez-Rodriguez
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By David W. Ball
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| QUESTION | ANSWER |
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1. Give an example of a nonpolar covalent bond. How do you know it is nonpolar? |
1. H–H; it is nonpolar because the two atoms have the same electronegativities (answers will vary). |
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3. How do you know which side of a polar bond has the partial negative charge? Identify the negatively charged side of each polar bond.
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3.
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5. Label the bond between the given atoms as nonpolar covalent, slightly polar covalent, definitely polar covalent, or likely ionic.
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5.
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7. Which covalent bond is stronger—a C–C bond or a C–H bond? |
7. C–H bond |
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9. Estimate the enthalpy change for this reaction. Start by drawing the Lewis electron dot diagrams for each substance. N2 + 3H2 → 2NH3 |
9. −80 kJ |
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11. Estimate the enthalpy change for this reaction. Start by drawing the Lewis electron dot diagrams for each substance. CH4 + 2O2 → CO2 + 2H2O |
11. −798 kJ |