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Unit 4 Objectives Students should be able to: 1. 2. 3. 4. 5. 6. 7. 8. 9. describe ionic, covalent and metallic bonds and explain their characteristics explain the octet rule and why it is reasonable explain the factors affecting lattice energy determine melting point trends using lattice energy create Lewis dot structures and use them to predict molecular geometry explain how multiple bonds are formed explain and predict bond polarity define resonance and predict when it will occur explain exceptions to the octet rule( odd number of electrons, less than, more than) 10. calculate reaction enthalpy from bond enthalpies 11. compare length and strength of single, double and triple bond 12. predict electron domain and molecular geometry 13. discuss the affect of non-bonding electrons on geometry and bond angles 14. predict polarity of a molecule based on shape 15. describe why a bond dipole forms 16. identify the hybridization of molecules