Practice Problems

Ionic or Covalent Bonds

1. Some plant fertilizer compounds are (NH₄)₂SO₄, Ca₃(PO₄)₂, K₂O, P₂O₅, and KCl. Which of these compounds contain both ionic and covalent bonds?

Answer

    2. Which of the following compounds is most likely to be ionic?

    A. FeCl₃

    B. MgCl₂

    C. CCl₄

    Answer

3. Which sample of the following compounds contains both ionic and covalent bonds?

A. CH₃Cl

B. C₂H₃OH

C. NaNO₃

    Answer

    Coulomb’s Law

4. Using Coulomb’s Law, calculate the energy for NaCl. (Given r= 0.76nm)

Answer

5. What does the Q in Coulomb’s Law equal?

A. The numerical ion charges.

B. Energy

C. Radius

Bonds Energy

6. Use bond energy values from the table above to estimate ∆ H for the following reaction in the gas phase.

H₂ + Cl₂ —> 2HCl

Answer

7. Use bond energy values from the table above to estimate ∆ H for the following reaction in the gas phase.

N≡N + 3H₂ —> 2NH₃

Answer

8. Given the following bond energy, estimate the enthalpy change (heat of a reaction) for the combustion of methane (CH₄)

    A. -245 kJ

    B. –808 kJ

    C. 3132 kJ

    Answer

9. Which of the compounds listed below would require the greatest energy to separate it into ions in the gaseous state?

A. NaI

B. MgO

C. Na₂O

Answer

_{Dipole Moment}

    10. Which of the following molecules has a dipole moment?

    A. CO₂             

    B. CH₄    

    C. H₂O

Answer

11. Show the direction of the bond polarity in HCl.

A. To the right.

B. To the left.

C. Nonpolar.

Answer

 

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