Exam #2 concept sheet

Disclaimer—THIS IS NOT EXHAUSTIVE BUT IS JUST A GUIDE

Watch for updates—this is in progress!

_{DON’T FORGET YOUR PENCIL AND CALCULATOR}

This is not meant as an exhaustive guide, but it is a good start.  Please use lectures, sections, online notes, textbook, and “google” resources for extra practice.

1.           Know the definition of and trends in electronegativity and what this means in terms of behavior.

2.     Be able to assess the dipole moment (polarity) of a bond and/or molecule, as well as the relative distribution of electron density.  Also, be able to identify the most/least polar molecule out of a set of choices.

3.           Know the similarities and differences between different bonding types.

4.           Be able to identify bonds with the greatest/least ionic/covalent/metallic character.

5.     Be able to give formulas of ionic compounds or of covalent compounds, given some information about the atoms involved in the molecule or formula unit.

6.     Know the definition and trends in lattice energy – be able to identify the compound with the least/most negative lattice energy.

7.           Know trends and relative strengths of different bonds.

8.           Use the bond energies (in kJ/mol) to estimate the heat of reaction.

9.           Use reaction enthalpies and bond information to estimate data for bonds with unknown energies.

10.   Be able to give/identify correct Lewis symbols for atoms or ions.

11.    Be able to draw or identify stable correct Lewis structures for molecules that obey the octet rule as well as those that don’t.

12.    Be able to give/identify correct resonance structures or hybrids.

13.    Be able to determine formal charges on atoms in molecules or ions.

14.         Know the shapes of molecules, as indicated by the VSEPR theory, as well as bond angles, etc.

 AGAIN, this is not exhaustive but gives you a good list of topics to study.

Good luck and try not to stress out!