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?
2. Which of the following compounds is most likely to be ionic?
3. Which sample of the following compounds contains both ionic and covalent bonds?
4. Using Coulomb’s Law, calculate the energy for NaCl. (Given r= 0.76nm)
5. What does the Q in Coulomb’s Law equal?
A. The numerical ion charges.
6. Use bond energy values from the table above to estimate ∆ H for the following reaction in the gas phase.
H2 + Cl2 —> 2HCl
7. Use bond energy values from the table above to estimate ∆ H for the following reaction in the gas phase.
N≡N + 3H2 —> 2NH3
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
9. Which of the compounds listed below would require the greatest energy to separate it into ions in the gaseous state?
10. Which of the following molecules has a dipole moment?
11. Show the direction of the bond polarity in HCl.
A. To the right.
B. To the left.