## CHE 230-001

### Facts and Skills to Master for the First Exam

The first exam will cover Chapters 1–3 in Klein. The following guidelines are not meant to be complete or comprehensive lists of the information you are expected to know.

Given a formula (with or without a charge), you should be able to determine the total number of valence electrons in the compound.

Given a formula (with or without a charge) and some basic connectivity information, you should be able to draw the Lewis structure of a compound, including unshared electrons and formal charges.

You should be able to compare two resonance structures and determine which is lower in energy. Given a Lewis structure, you should be able to draw its next-best resonance structure, using electron-flow arrows to show how you arrive at one resonance structure from another. You should be able to draw the resonance structure indicated by electron-flow arrows.

You should understand the concepts behind *sp*^{3}-, *sp*^{2}-, and *sp*-hybridization, and you should know the mutual orientations, bond angles, and energies of the orbitals in *sp*^{3}-, *sp*^{2}-, and *sp*-hybridized atoms.

You should be able to determine the hybridization of an atom from its bonding pattern, and, from its hybridization, you should be able to draw conclusions about its geometry and the energies of its orbitals.

Given a partial formula and a functional group, you should be able to draw one or more structures with that formula that contain that functional group.

You should be able to determine which side of an acid–base reaction is favored at equilibrium. Given the acids' p*K*_{a}s, you should be able to compute the equilibrium constant for the reaction. You should be able to use electron-flow arrows to show how the location of a pair of electrons changes in an acid–base reaction.

Using size & electronegativity to compare different elements, and using CRHIS to compare the same elements, you should be able to determine which among a set of compounds is most acidic or basic, and you should be able to determine which atom in a compound is most acidic or basic.

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