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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Other Aspects of Covalent Bonds

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QUESTION ANSWER

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).

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.

  1. H–Cl
  2. H–S

3.

  1. Cl side
  2. S side

5.

Label the bond between the given atoms as nonpolar covalent, slightly polar covalent, definitely polar covalent, or likely ionic.

  1. H and C
  2. C and F
  3. K and F

5.

  1. slightly polar covalent
  2. definitely polar covalent
  3. likely ionic

7.

Which covalent bond is stronger—a C–C bond or a C–H bond?

7.

C–H bond

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

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

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